diff --git a/motorApp/AcsSrc/drvMCB4B.cc b/motorApp/AcsSrc/drvMCB4B.cc
index d54821c5..d888947b 100644
--- a/motorApp/AcsSrc/drvMCB4B.cc
+++ b/motorApp/AcsSrc/drvMCB4B.cc
@@ -264,7 +264,7 @@ STATIC int set_status(int card, int signal)
     /* Test for post-move string. */
     if ((status.Bits.RA_DONE || ls_active == true) && nodeptr != 0 && nodeptr->postmsgptr != 0)
     {
-        send_mess(card, nodeptr->postmsgptr, (char) NULL);
+        send_mess(card, nodeptr->postmsgptr, (char*) NULL);
         /* The MCB4B always sends back a response, read it and discard */
         recv_mess(card, buff, WAIT);
         nodeptr->postmsgptr = NULL;
diff --git a/motorApp/AcsTech80Src/drvSPiiPlus.cc b/motorApp/AcsTech80Src/drvSPiiPlus.cc
index 9f5703d1..f944cc90 100644
--- a/motorApp/AcsTech80Src/drvSPiiPlus.cc
+++ b/motorApp/AcsTech80Src/drvSPiiPlus.cc
@@ -404,7 +404,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
         strncpy(send_buff, nodeptr->postmsgptr, 80);
-	send_mess(card, send_buff, (char) NULL);
+	send_mess(card, send_buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
diff --git a/motorApp/AerotechSrc/drvSoloist.cc b/motorApp/AerotechSrc/drvSoloist.cc
index 380689c2..dc0e0fd1 100644
--- a/motorApp/AerotechSrc/drvSoloist.cc
+++ b/motorApp/AerotechSrc/drvSoloist.cc
@@ -218,7 +218,7 @@ static int set_status(int card, int signal)
 
 	// get the axis status
 	sprintf(buff, "AXISSTATUS()");
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	comm_status = recv_mess(card, buff, 1);
 	if (comm_status > 0 && buff[0] == ASCII_ACK_CHAR)
 	{
@@ -271,7 +271,7 @@ static int set_status(int card, int signal)
 
 	/* get the axis fault status */
 	sprintf(buff, "AXISFAULT()");
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	comm_status = recv_mess(card, buff, 1);
 	axis_status = atoi(&buff[1]);
 	status.Bits.RA_PLUS_LS   = axis_status & CW_FAULT_BIT ? 1 : 0;
@@ -285,7 +285,7 @@ static int set_status(int card, int signal)
 
 	// get the position
 	sprintf(buff, "PFBKPROG()");
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	recv_mess(card, buff, 1);
 	if (buff[0] == ASCII_ACK_CHAR)
 	{
@@ -337,7 +337,7 @@ static int set_status(int card, int signal)
 	if ((status.Bits.RA_DONE || ls_active) && nodeptr != 0 && nodeptr->postmsgptr != 0)
 	{
 		strcpy(buff, nodeptr->postmsgptr);
-		send_mess(card, buff, (char) NULL);
+		send_mess(card, buff, (char*) NULL);
 		nodeptr->postmsgptr = NULL;
 	}
 
@@ -591,7 +591,7 @@ static int motor_init()
 				// we only care if we get a response
 				// so we don't need to send a valid command
 				strcpy(buff, "NONE");
-				send_mess(card_index, buff, (char) NULL);
+				send_mess(card_index, buff, (char*) NULL);
 				status = recv_mess(card_index, buff, 1);
 
 				retry++;
@@ -603,7 +603,7 @@ static int motor_init()
 				brdptr->motor_in_motion = 0;
 				// Read controller ID string
 				strcpy(buff, "GETPARM(265)"); //UserString1
-				send_mess(card_index, buff, (char) NULL);
+				send_mess(card_index, buff, (char*) NULL);
 				recv_mess(card_index, buff, 1);
 				if (buff[0] == ASCII_ACK_CHAR)
 				{
@@ -620,7 +620,7 @@ static int motor_init()
 				{
 					// Does this axis actually exist?
 					sprintf(buff, "GETPARM(257)"); //AxisName
-					send_mess(card_index, buff, (char) NULL);
+					send_mess(card_index, buff, (char*) NULL);
 					recv_mess(card_index, buff, 1);
 
 					// We know the axis exists if we got an ACK response
@@ -645,7 +645,7 @@ static int motor_init()
 
 						// Determine if encoder present based on open/closed loop mode.
 						sprintf(buff, "GETPARM(58)"); //CfgFbkPosType
-						send_mess(card_index, buff, (char) NULL);
+						send_mess(card_index, buff, (char*) NULL);
 						recv_mess(card_index, buff, 1);
 						if (buff[0] == ASCII_ACK_CHAR)
 						{
@@ -658,7 +658,7 @@ static int motor_init()
 
 						// Determine if gains are supported based on the motor type.
 						sprintf(buff, "GETPARM(33)"); //CfgMotType
-						send_mess(card_index, buff, (char) NULL);
+						send_mess(card_index, buff, (char*) NULL);
 						recv_mess(card_index, buff, 1);
 						if (buff[0] == ASCII_ACK_CHAR)
 						{
@@ -671,12 +671,12 @@ static int motor_init()
 
 						// Stop all motors
 						sprintf(buff, "ABORT");
-						send_mess(card_index, buff, (char) NULL);
+						send_mess(card_index, buff, (char*) NULL);
 						recv_mess(card_index, buff, 1);
 
 						// Determine drive resolution
 						sprintf(buff, "GETPARM(3)"); //PosScaleFactor
-						send_mess(card_index, buff, (char) NULL);
+						send_mess(card_index, buff, (char*) NULL);
 						recv_mess(card_index, buff, 1);
 						if (buff[0] == ASCII_ACK_CHAR)
 						{
@@ -696,7 +696,7 @@ static int motor_init()
 
 						// Save home preset position
 						sprintf(buff, "GETPARM(108)"); //HomeOffset
-						send_mess(card_index, buff, (char) NULL);
+						send_mess(card_index, buff, (char*) NULL);
 						recv_mess(card_index, buff, 1);
 						if (buff[0] == ASCII_ACK_CHAR)
 						{
@@ -705,7 +705,7 @@ static int motor_init()
 
 						// Determine low limit
 						sprintf(buff, "GETPARM(47)"); //ThresholdSoftCCW
-						send_mess(card_index, buff, (char) NULL);
+						send_mess(card_index, buff, (char*) NULL);
 						recv_mess(card_index, buff, 1);
 						if (buff[0] == ASCII_ACK_CHAR)
 						{
@@ -714,7 +714,7 @@ static int motor_init()
 
 						// Determine high limit
 						sprintf(buff, "GETPARM(48)"); //ThresholdSoftCW
-						send_mess(card_index, buff, (char) NULL);
+						send_mess(card_index, buff, (char*) NULL);
 						recv_mess(card_index, buff, 1);
 						if (buff[0] == ASCII_ACK_CHAR)
 						{
@@ -723,7 +723,7 @@ static int motor_init()
 
 						// Save the HomeDirection parameter
 						sprintf(buff, "GETPARM(106)"); //HomeDirection
-						send_mess(card_index, buff, (char) NULL);
+						send_mess(card_index, buff, (char*) NULL);
 						recv_mess(card_index, buff, 1);
 						if (buff[0] == ASCII_ACK_CHAR)
 						{
diff --git a/motorApp/DeltaTauSrc/drvPmac.cc b/motorApp/DeltaTauSrc/drvPmac.cc
index ed7cd2b8..d350fbba 100644
--- a/motorApp/DeltaTauSrc/drvPmac.cc
+++ b/motorApp/DeltaTauSrc/drvPmac.cc
@@ -219,7 +219,7 @@ static int set_status(int card, int signal)
     status.Bits.EA_POSITION = (motorstat.word1.Bits.amp_enabled == YES) ? 1 : 0;
 
     sprintf(outbuf, "M%.2d61", (signal + 1));	// Get Commanded Position.
-    send_mess(card, outbuf, (char) NULL);
+    send_mess(card, outbuf, (char*) NULL);
     recv_mess(card, buff, 1);
 
     motorData = atof(buff);
@@ -269,7 +269,7 @@ static int set_status(int card, int signal)
     status.Bits.EA_HOME	      = 0;
 
     sprintf(outbuf, "M%.2d62", (signal + 1));
-    send_mess(card, outbuf, (char) NULL);	// Get Actual Position.
+    send_mess(card, outbuf, (char*) NULL);	// Get Actual Position.
     recv_mess(card, buff, 1);
     motorData = atof(buff);
     motor_info->encoder_position = (int32_t) motorData;
@@ -292,7 +292,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
 	strcpy(buff, nodeptr->postmsgptr);
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
@@ -833,10 +833,10 @@ static int motor_init()
                 count = pmotor->response[0];
             }
 
-	    send_mess(card_index, "TYPE", (char) NULL);
+	    send_mess(card_index, "TYPE", (char*) NULL);
 	    recv_mess(card_index, (char *) pmotorState->ident, 1);
 
-	    send_mess(card_index, "VERSION", (char) NULL);
+	    send_mess(card_index, "VERSION", (char*) NULL);
 	    recv_mess(card_index, axis_pos, 1);
 	    strcat((char *) &pmotorState->ident, ", ");
 	    strcat((char *) &pmotorState->ident, axis_pos);
@@ -849,7 +849,7 @@ static int motor_init()
 		char outbuf[10];
 
 		sprintf(outbuf, "I%.2d00", (total_axis + 1));
-		send_mess(card_index, outbuf, (char) NULL);
+		send_mess(card_index, outbuf, (char*) NULL);
 		recv_mess(card_index, axis_pos, 1);
 		if (strcmp(axis_pos, "0") == 0)
 		    errind = true;
@@ -860,12 +860,12 @@ static int motor_init()
 
 		    // Set Ixx20=1 and Ixx21=0; control acceleration via Ixx19.
 		    sprintf(outbuf, "I%.2d20=1", (total_axis + 1));
-		    send_mess(card_index, outbuf, (char) NULL);
+		    send_mess(card_index, outbuf, (char*) NULL);
 		    sprintf(outbuf, "I%.2d21=0", (total_axis + 1));
-		    send_mess(card_index, outbuf, (char) NULL);
+		    send_mess(card_index, outbuf, (char*) NULL);
 
 		    sprintf(outbuf, "I%.2d08", (total_axis + 1));
-		    send_mess(card_index, outbuf, (char) NULL);
+		    send_mess(card_index, outbuf, (char*) NULL);
 		    recv_mess(card_index, axis_pos, 1);
 		    cntrl->pos_scaleFac[total_axis] = atof(axis_pos) * 32.0;
 		}
diff --git a/motorApp/ImsSrc/drvIM483SM.cc b/motorApp/ImsSrc/drvIM483SM.cc
index 7d6b1055..5d0157ef 100644
--- a/motorApp/ImsSrc/drvIM483SM.cc
+++ b/motorApp/ImsSrc/drvIM483SM.cc
@@ -238,7 +238,7 @@ static int set_status(int card, int signal)
     nodeptr = motor_info->motor_motion;
     status.All = motor_info->status.All;
 
-    send_mess(card, "^", (char) NULL);
+    send_mess(card, "^", (char*) NULL);
     rtn_state = recv_mess(card, buff, 1);
     if (rtn_state > 0)
     {
@@ -273,7 +273,7 @@ static int set_status(int card, int signal)
      * Skip to substring for this motor, convert to double
      */
 
-    send_mess(card, "Z 0", (char) NULL);
+    send_mess(card, "Z 0", (char*) NULL);
     recv_mess(card, buff, 1);
 
     motorData = atof(&buff[5]);
@@ -295,7 +295,7 @@ static int set_status(int card, int signal)
 
     plusdir = (status.Bits.RA_DIRECTION) ? true : false;
 
-    send_mess(card, "] 0", (char) NULL);
+    send_mess(card, "] 0", (char*) NULL);
     recv_mess(card, buff, 1);
     rtnval = atoi(&buff[5]);
 
@@ -318,7 +318,7 @@ static int set_status(int card, int signal)
     else
         status.Bits.RA_MINUS_LS = 0;
 
-    send_mess(card, "] 1", (char) NULL);
+    send_mess(card, "] 1", (char*) NULL);
     recv_mess(card, buff, 1);
     rtnval = buff[5];
 
@@ -336,7 +336,7 @@ static int set_status(int card, int signal)
         motor_info->encoder_position = 0;
     else
     {
-        send_mess(card, "z 0", (char) NULL);
+        send_mess(card, "z 0", (char*) NULL);
         recv_mess(card, buff, 1);
         motorData = atof(&buff[5]);
         motor_info->encoder_position = (epicsInt32) motorData;
@@ -359,7 +359,7 @@ static int set_status(int card, int signal)
         nodeptr->postmsgptr != 0)
     {
         strcpy(buff, nodeptr->postmsgptr);
-        send_mess(card, buff, (char) NULL);
+        send_mess(card, buff, (char*) NULL);
         nodeptr->postmsgptr = NULL;
     }
 
@@ -551,9 +551,9 @@ static int motor_init()
                 /* flush any junk at input port - should not be any data available */
                 pasynOctetSyncIO->flush(cntrl->pasynUser);
 
-                send_mess(card_index, "\003", (char) NULL); /* Reset device. */
+                send_mess(card_index, "\003", (char*) NULL); /* Reset device. */
                 epicsThreadSleep(1.0);
-                send_mess(card_index, " ", (char) NULL);
+                send_mess(card_index, " ", (char*) NULL);
 
                 /* Save controller identification message. */
                 src = buff;
diff --git a/motorApp/KohzuSrc/drvSC800.cc b/motorApp/KohzuSrc/drvSC800.cc
index 394eadba..74999a7c 100644
--- a/motorApp/KohzuSrc/drvSC800.cc
+++ b/motorApp/KohzuSrc/drvSC800.cc
@@ -221,7 +221,7 @@ static int set_status(int card, int signal)
 	charcnt = recv_mess(card, buff, FLUSH);
 
     sprintf(buff,"STR1/%d",(signal + 1));
-    send_mess(card, buff, (char) NULL);		/*  Tell Status */
+    send_mess(card, buff, (char*) NULL);		/*  Tell Status */
     charcnt = recv_mess(card, buff, 1);
     convert_cnt = sscanf(buff, "C\tSTR%d\t1\t%d\t%d\t%d\t%d\t%d\t%d\t%d",
                          &str_axis, &str_move, &str_norg, &str_orgg,
@@ -256,7 +256,7 @@ static int set_status(int card, int signal)
 
    /* Parse motor position */
     sprintf(buff,"RDP%d/0", (signal + 1));
-    send_mess(card, buff, (char) NULL);  /*  Tell Position */
+    send_mess(card, buff, (char*) NULL);  /*  Tell Position */
     recv_mess(card, buff, 1);
     convert_cnt = sscanf(buff, "C\tRDP%d\t%d", &str_axis, &motorData);
     
@@ -285,7 +285,7 @@ static int set_status(int card, int signal)
 
     /* Torque enabled? */
     sprintf(buff,"RSY%d/21", (signal + 1));
-    send_mess(card, buff, (char) NULL);  /*  Tell Position */
+    send_mess(card, buff, (char*) NULL);  /*  Tell Position */
     recv_mess(card, buff, 1);
     convert_cnt = sscanf(buff, "C\tRSY%d\t21\t%d", &str_axis, &str_move);
     status.Bits.EA_POSITION = (str_move == 0) ? 1 : 0;
@@ -327,7 +327,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
 	strcpy(buff, nodeptr->postmsgptr);
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
diff --git a/motorApp/MclennanSrc/drvPM304.cc b/motorApp/MclennanSrc/drvPM304.cc
index a33977b7..29d1350c 100644
--- a/motorApp/MclennanSrc/drvPM304.cc
+++ b/motorApp/MclennanSrc/drvPM304.cc
@@ -333,7 +333,7 @@ STATIC int set_status(int card, int signal)
     {
         strcpy(buff, nodeptr->postmsgptr);
         strcat(buff, "\r");
-        send_mess(card, buff, (char) NULL);
+        send_mess(card, buff, (char*) NULL);
         nodeptr->postmsgptr = NULL;
     }
 
diff --git a/motorApp/MicosSrc/drvMicos.cc b/motorApp/MicosSrc/drvMicos.cc
index f2eb8a95..c6e7b2d2 100644
--- a/motorApp/MicosSrc/drvMicos.cc
+++ b/motorApp/MicosSrc/drvMicos.cc
@@ -286,7 +286,7 @@ static int set_status(int card, int signal)
     nodeptr->postmsgptr != 0)
     {
         strcpy(buff, nodeptr->postmsgptr);
-        send_mess(card, buff, (char) NULL);
+        send_mess(card, buff, (char*) NULL);
         /* The Micos will not send back a response for a 'set' command, don't need next line */
         /* recv_mess(card, buff, WAIT); */
         nodeptr->postmsgptr = NULL;
diff --git a/motorApp/MicroMoSrc/drvMVP2001.cc b/motorApp/MicroMoSrc/drvMVP2001.cc
index 0f5ed0d0..233cbb7b 100644
--- a/motorApp/MicroMoSrc/drvMVP2001.cc
+++ b/motorApp/MicroMoSrc/drvMVP2001.cc
@@ -306,7 +306,7 @@ static int set_status(int card, int signal)
     statusStr[0] = positionStr[0] = buff[0] = '\0';
 
     sprintf(buff, "%d ST", (signal + 1));
-    send_mess(card, buff, (char) NULL);
+    send_mess(card, buff, (char*) NULL);
     rtn_state = recv_mess(card, buff, 1);
     if (rtn_state > 0)
     {
@@ -342,7 +342,7 @@ static int set_status(int card, int signal)
     status.Bits.RA_DONE = !mstat.Bits.inMotion;
 
     sprintf(buff, "%d POS", (signal + 1));
-    send_mess(card, buff, (char) NULL);
+    send_mess(card, buff, (char*) NULL);
     recv_mess(card, buff, 1);
 
     /*
@@ -433,7 +433,7 @@ static int set_status(int card, int signal)
         nodeptr->postmsgptr != 0)
     {
         strcpy(buff, nodeptr->postmsgptr);
-        send_mess(card, buff, (char) NULL);
+        send_mess(card, buff, (char*) NULL);
         nodeptr->postmsgptr = NULL;
     }
 
@@ -644,7 +644,7 @@ static int motor_init()
                 do
                 {
                     sprintf(buff, "%d ST", (total_axis + 1));
-                    send_mess(card_index, buff, (char) NULL);
+                    send_mess(card_index, buff, (char*) NULL);
                     status = recv_mess(card_index, buff, 1);
                     retry++;
                 } while (status <= 0 && retry < 3);
@@ -666,11 +666,11 @@ static int motor_init()
 
                 /* stop and initialize the controller */
                 sprintf(buff, "%d V 0", (motor_index + 1));
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
                 sprintf(buff, "%d HO", (motor_index + 1));
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
                 sprintf(buff, "%d EN", (motor_index + 1));
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
 
                 motor_info->status.All = 0;
                 motor_info->no_motion_count = 0;
@@ -689,7 +689,7 @@ static int motor_init()
                 limitStr[0] = '\0';
                 /* Determine low limit */
                 sprintf(buff, "%d LL -", (motor_index + 1));
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
                 recv_mess(card_index, buff, 1);
                 strncat(limitStr, &buff[5], 8);
                 motor_info->low_limit = (epicsInt32) strtoul(limitStr, NULL, 16);
@@ -697,7 +697,7 @@ static int motor_init()
                 limitStr[0] = '\0';
                 /* Determine high limit */
                 sprintf(buff, "%d LL", (motor_index + 1));
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
                 recv_mess(card_index, buff, 1);
                 strncat(limitStr, &buff[5], 8);
                 motor_info->high_limit = (epicsInt32) strtoul(limitStr, NULL, 16);
@@ -715,7 +715,7 @@ static int motor_init()
                 epicsThreadSleep(0.2);
 
                 sprintf(buff, "%d HO", (motor_index + 1));
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
 
                 set_status(card_index, motor_index);    /* Read status of each
                                      * motor */
diff --git a/motorApp/MotorSrc/motordevCom.cc b/motorApp/MotorSrc/motordevCom.cc
index 9650d0c1..c9a467e6 100644
--- a/motorApp/MotorSrc/motordevCom.cc
+++ b/motorApp/MotorSrc/motordevCom.cc
@@ -462,9 +462,9 @@ epicsShareFunc long motor_start_trans_com(struct motorRecord *mr, struct board_s
     motor_call->signal = axis;
     motor_call->type = UNDEFINED;
     motor_call->mrecord = (struct dbCommon *) mr;
-    motor_call->message[0] = (char) NULL;
-    motor_call->postmsgptr = (char) NULL;
-    motor_call->termstring = (char) NULL;
+    motor_call->message[0] = (char)  NULL;
+    motor_call->postmsgptr = (char*) NULL;
+    motor_call->termstring = (char*) NULL;
     
     return (0);
 }
diff --git a/motorApp/NewportSrc/drvESP300.cc b/motorApp/NewportSrc/drvESP300.cc
index afc38321..ef899e83 100644
--- a/motorApp/NewportSrc/drvESP300.cc
+++ b/motorApp/NewportSrc/drvESP300.cc
@@ -225,7 +225,7 @@ static int set_status(int card, int signal)
     status.All = motor_info->status.All;
 
     sprintf(outbuff, "%.2dMD", signal + 1);
-    send_mess(card, outbuff, (char) NULL);
+    send_mess(card, outbuff, (char*) NULL);
     charcnt = recv_mess(card, inbuff, 1);
 
     if (charcnt == 1 && (inbuff[0] == '0' || inbuff[0] == '1'))
@@ -255,7 +255,7 @@ static int set_status(int card, int signal)
 
     /* Get motor position. */
     sprintf(outbuff, READ_POSITION, signal + 1);
-    send_mess(card, outbuff, (char) NULL);
+    send_mess(card, outbuff, (char*) NULL);
     charcnt = recv_mess(card, inbuff, 1);
 
     motorData = atof(inbuff) / cntrl->drive_resolution[signal];
@@ -279,7 +279,7 @@ static int set_status(int card, int signal)
 
     /* Get travel limit switch status. */
     sprintf(outbuff, "%.2dPH", signal + 1);
-    send_mess(card, outbuff, (char) NULL);
+    send_mess(card, outbuff, (char*) NULL);
     charcnt = recv_mess(card, inbuff, 1);
     cptr = strchr(inbuff, 'H');
     if (cptr == NULL)
@@ -318,7 +318,7 @@ static int set_status(int card, int signal)
 
     /* Get motor power on/off status. */
     sprintf(outbuff, "%.2dMO?", signal + 1);
-    send_mess(card, outbuff, (char) NULL);
+    send_mess(card, outbuff, (char*) NULL);
     charcnt = recv_mess(card, inbuff, 1);
     power = atoi(inbuff) ? true : false;
 
@@ -331,7 +331,7 @@ static int set_status(int card, int signal)
 
     /* Get error code. */
     sprintf(outbuff, "%.2dTE?", signal + 1);
-    send_mess(card, outbuff, (char) NULL);
+    send_mess(card, outbuff, (char*) NULL);
     charcnt = recv_mess(card, inbuff, 1);
     errcode = atoi(inbuff);
     if (errcode != 0)
@@ -358,7 +358,7 @@ static int set_status(int card, int signal)
         nodeptr->postmsgptr != 0)
     {
         strcpy(outbuff, nodeptr->postmsgptr);
-        send_mess(card, outbuff, (char) NULL);
+        send_mess(card, outbuff, (char*) NULL);
         nodeptr->postmsgptr = NULL;
     }
 
@@ -638,7 +638,7 @@ static int motor_init()
 
             do
             {
-                send_mess(card_index, GET_IDENT, (char) NULL);
+                send_mess(card_index, GET_IDENT, (char*) NULL);
                 status = recv_mess(card_index, buff, 1);
                 retry++;
                 /* Return value is length of response string */
@@ -652,7 +652,7 @@ errexit:
             brdptr->motor_in_motion = 0;
             strcpy(brdptr->ident, &buff[1]);  /* Skip "\n" */
 
-            send_mess(card_index, "ZU", (char) NULL);
+            send_mess(card_index, "ZU", (char*) NULL);
             recv_mess(card_index, buff, 1);
             total_axis = buff[0] >> 4;
             if (total_axis > 4)
@@ -664,7 +664,7 @@ errexit:
             for (motor_index = 0; motor_index < total_axis; motor_index++)
             {
                 sprintf(buff, STOP_AXIS, motor_index + 1);  /* Stop motor */
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
                 /* Initialize. */
                 brdptr->motor_info[motor_index].motor_motion = NULL;
             }
diff --git a/motorApp/NewportSrc/drvMM3000.cc b/motorApp/NewportSrc/drvMM3000.cc
index a1324701..7131ed04 100644
--- a/motorApp/NewportSrc/drvMM3000.cc
+++ b/motorApp/NewportSrc/drvMM3000.cc
@@ -245,7 +245,7 @@ STATIC int set_status(int card, int signal)
     status.All = motor_info->status.All;
 
     sprintf(outbuff, "%dMS", signal + 1);
-    send_mess(card, outbuff, (char) NULL);
+    send_mess(card, outbuff, (char*) NULL);
     charcnt = recv_mess(card, inbuff, 1);
     if (charcnt > 0)
     {
@@ -310,7 +310,7 @@ STATIC int set_status(int card, int signal)
     status.Bits.EA_HOME     = 0;
 
     sprintf(outbuff, "%dTP", signal + 1);
-    send_mess(card, outbuff, (char) NULL);
+    send_mess(card, outbuff, (char*) NULL);
     charcnt = recv_mess(card, inbuff, 1);
     if (charcnt > 0)
     {
@@ -373,7 +373,7 @@ STATIC int set_status(int card, int signal)
         nodeptr->postmsgptr != 0)
     {
         strcpy(outbuff, nodeptr->postmsgptr);
-        send_mess(card, outbuff, (char) NULL);
+        send_mess(card, outbuff, (char*) NULL);
         nodeptr->postmsgptr = NULL;
     }
 
@@ -631,7 +631,7 @@ STATIC int motor_init()
             /* flush any junk at input port - should not be any data available */
             pasynOctetSyncIO->flush(cntrl->pasynUser);
 
-            send_mess(card_index, GET_IDENT, (char) NULL);
+            send_mess(card_index, GET_IDENT, (char*) NULL);
             status = recv_mess(card_index, axis_pos, 1);
             /* Return value is length of response string */
         }
@@ -640,12 +640,12 @@ STATIC int motor_init()
         {
             brdptr->localaddr = (char *) NULL;
             brdptr->motor_in_motion = 0;
-            send_mess(card_index, STOP_ALL, (char) NULL);   /* Stop all motors */
-            send_mess(card_index, GET_IDENT, (char) NULL);  /* Read controller ID string */
+            send_mess(card_index, STOP_ALL, (char*) NULL);   /* Stop all motors */
+            send_mess(card_index, GET_IDENT, (char*) NULL);  /* Read controller ID string */
             recv_mess(card_index, buff, 1);
             strncpy(brdptr->ident, &buff[0], MAX_IDENT_LEN);  /* Skip "VE" */
 
-            send_mess(card_index, "RC", (char) NULL);
+            send_mess(card_index, "RC", (char*) NULL);
             recv_mess(card_index, buff, 1);
             bufptr = epicsStrtok_r(buff, "=", &tok_save);
             bufptr = epicsStrtok_r(NULL, " ", &tok_save);
@@ -692,7 +692,7 @@ STATIC int motor_init()
                 else
                 {
                     sprintf(buff, "%dTPE", motor_index + 1);
-                    send_mess(card_index, buff, (char) NULL);
+                    send_mess(card_index, buff, (char*) NULL);
                     recv_mess(card_index, buff, 1);
 
                     if (strcmp(buff, "E01") == 0)
diff --git a/motorApp/NewportSrc/drvMM4000.cc b/motorApp/NewportSrc/drvMM4000.cc
index d8c993e6..66a9badd 100644
--- a/motorApp/NewportSrc/drvMM4000.cc
+++ b/motorApp/NewportSrc/drvMM4000.cc
@@ -259,14 +259,14 @@ static void start_status(int card)
     if (card >= 0)
     {
         cntrl = (struct MMcontroller *) motor_state[card]->DevicePrivate;
-        send_mess(card, READ_STATUS, (char) NULL);
+        send_mess(card, READ_STATUS, (char*) NULL);
         status = recv_mess(card, cntrl->status_string, 1);
         if (status > 0)
         {
             cntrl->status = NORMAL;
-            send_mess(card, READ_POSITION, (char) NULL);
+            send_mess(card, READ_POSITION, (char*) NULL);
             recv_mess(card, cntrl->position_string, 1);
-            send_mess(card, READ_FEEDBACK, (char) NULL);
+            send_mess(card, READ_FEEDBACK, (char*) NULL);
             recv_mess(card, cntrl->feedback_string, 1);
         }
         else
@@ -284,7 +284,7 @@ static void start_status(int card)
          * responses.  This minimizes the latency due to processing on each card
          */
         for (itera = 0; (itera < total_cards) && motor_state[itera]; itera++)
-            send_mess(itera, READ_STATUS, (char) NULL);
+            send_mess(itera, READ_STATUS, (char*) NULL);
         for (itera = 0; (itera < total_cards) && motor_state[itera]; itera++)
         {
             cntrl = (struct MMcontroller *) motor_state[itera]->DevicePrivate;
@@ -292,7 +292,7 @@ static void start_status(int card)
             if (status > 0)
             {
                 cntrl->status = NORMAL;
-                send_mess(itera, READ_FEEDBACK, (char) NULL);
+                send_mess(itera, READ_FEEDBACK, (char*) NULL);
                 recv_mess(itera, cntrl->feedback_string, 1);
             }
             else
@@ -304,7 +304,7 @@ static void start_status(int card)
             }
         }
         for (itera = 0; (itera < total_cards) && motor_state[itera]; itera++)
-            send_mess(itera, READ_POSITION, (char) NULL);
+            send_mess(itera, READ_POSITION, (char*) NULL);
         for (itera = 0; (itera < total_cards) && motor_state[itera]; itera++)
         {
             cntrl = (struct MMcontroller *) motor_state[itera]->DevicePrivate;
@@ -388,7 +388,7 @@ static int set_status(int card, int signal)
         if (motor_info->pid_present == YES && drvMM4000ReadbackDelay != 0)
         {
             epicsThreadSleep((double) drvMM4000ReadbackDelay/1000.0);
-            send_mess(card, READ_STATUS, (char) NULL);
+            send_mess(card, READ_STATUS, (char*) NULL);
             recv_mess(card, cntrl->status_string, 1);
             pos = signal*5 + 3;  /* Offset in status string */
             mstat.All = cntrl->status_string[pos];
@@ -469,7 +469,7 @@ static int set_status(int card, int signal)
 
 
     /* Check for controller error. */
-    send_mess(card, "TE;", (char) NULL);
+    send_mess(card, "TE;", (char*) NULL);
     recv_mess(card, buff, 1);
     if (buff[2] == '@')
         status.Bits.RA_PROBLEM = 0;
@@ -496,7 +496,7 @@ static int set_status(int card, int signal)
         nodeptr->postmsgptr != 0)
     {
         strcpy(buff, nodeptr->postmsgptr);
-        send_mess(card, buff, (char) NULL);
+        send_mess(card, buff, (char*) NULL);
         nodeptr->postmsgptr = NULL;
     }
 
@@ -708,7 +708,7 @@ static int motor_init()
 
             do
             {
-                send_mess(card_index, READ_POSITION, (char) NULL);
+                send_mess(card_index, READ_POSITION, (char*) NULL);
                 status = recv_mess(card_index, axis_pos, 1);
                 retry++;
                 /* Return value is length of response string */
@@ -719,8 +719,8 @@ static int motor_init()
         {
             brdptr->localaddr = (char *) NULL;
             brdptr->motor_in_motion = 0;
-            send_mess(card_index, STOP_ALL, (char) NULL);   /* Stop all motors */
-            send_mess(card_index, GET_IDENT, (char) NULL);  /* Read controller ID string */
+            send_mess(card_index, STOP_ALL, (char*) NULL);   /* Stop all motors */
+            send_mess(card_index, GET_IDENT, (char*) NULL);  /* Read controller ID string */
             recv_mess(card_index, buff, 1);
             strcpy(brdptr->ident, &buff[2]);  /* Skip "VE" */
 
@@ -744,7 +744,7 @@ static int motor_init()
                 continue;
             }
 
-            send_mess(card_index, READ_POSITION, (char) NULL);
+            send_mess(card_index, READ_POSITION, (char*) NULL);
             recv_mess(card_index, axis_pos, 1);
 
             /* The return string will tell us how many axes this controller has */
@@ -769,7 +769,7 @@ static int motor_init()
 
                 /* Determine if encoder present based on open/closed loop mode. */
                 sprintf(buff, "%dTC", motor_index + 1);
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
                 recv_mess(card_index, buff, 1);
                 loop_state = atoi(&buff[3]);    /* Skip first 3 characters */
                 if (loop_state != 0)
@@ -781,7 +781,7 @@ static int motor_init()
 
                 /* Determine drive resolution. */
                 sprintf(buff, "%dTU", motor_index + 1);
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
                 recv_mess(card_index, buff, 1);
                 cntrl->drive_resolution[motor_index] = atof(&buff[3]);
 
@@ -792,19 +792,19 @@ static int motor_init()
 
                 /* Save home preset position. */
                 sprintf(buff, "%dXH", motor_index + 1);
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
                 recv_mess(card_index, buff, 1);
                 cntrl->home_preset[motor_index] = atof(&buff[3]);
 
                 /* Determine low limit */
                 sprintf(buff, "%dTL", motor_index + 1);
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
                 recv_mess(card_index, buff, 1);
                 motor_info->low_limit = atof(&buff[3]);
 
                 /* Determine high limit */
                 sprintf(buff, "%dTR", motor_index + 1);
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
                 recv_mess(card_index, buff, 1);
                 motor_info->high_limit = atof(&buff[3]);
 
diff --git a/motorApp/NewportSrc/drvPM500.cc b/motorApp/NewportSrc/drvPM500.cc
index 7e60685b..8dc213a4 100644
--- a/motorApp/NewportSrc/drvPM500.cc
+++ b/motorApp/NewportSrc/drvPM500.cc
@@ -236,7 +236,7 @@ static int set_status(int card, int signal)
 
     /* Request the status and position of this motor */
     sprintf(buff, "%sR", axis_name);
-    send_mess(card, buff, (char) NULL);
+    send_mess(card, buff, (char*) NULL);
     rtnval = recv_mess(card, response, 1);
     if (rtnval > 0)
     {
@@ -286,7 +286,7 @@ static int set_status(int card, int signal)
 
     /* Set Motor On/Off status */
     sprintf(buff, "%sM?", axis_name);
-    send_mess(card, buff, (char) NULL);
+    send_mess(card, buff, (char*) NULL);
     rtnval = recv_mess(card, response, 1);
     status.Bits.EA_POSITION = (int) atof(&response[2]);
 
@@ -336,7 +336,7 @@ static int set_status(int card, int signal)
     {
         strcpy(buff, nodeptr->postmsgptr);
         strcat(buff, "\r");
-        send_mess(card, buff, (char) NULL);
+        send_mess(card, buff, (char*) NULL);
         nodeptr->postmsgptr = NULL;
     }
 
@@ -543,7 +543,7 @@ static int motor_init()
             pasynOctetSyncIO->flush(cntrl->pasynUser);
 
             /* Send a SCUM 1 command to put device in this mode. */
-            send_mess(card_index, "SCUM 1", (char) NULL);
+            send_mess(card_index, "SCUM 1", (char*) NULL);
             recv_mess(card_index, buff, 1);
 
             /* Set up basic controller parameters
@@ -564,12 +564,12 @@ static int motor_init()
              *   Bit 13=0, Eearly serial poll mapping
              *   Bit 14=0, No SRQ assertion
              */
-            send_mess(card_index, "SENAINT $AF", (char) NULL);
+            send_mess(card_index, "SENAINT $AF", (char*) NULL);
             recv_mess(card_index, buff, 1);
 
             /* Send a message and read response from controller to see if
              * it exists */
-            send_mess(card_index, GET_IDENT, (char) NULL);
+            send_mess(card_index, GET_IDENT, (char*) NULL);
             status = recv_mess(card_index, buff, 1);
             /* Return value is length of response string */
         }
@@ -578,7 +578,7 @@ static int motor_init()
         {
             brdptr->localaddr = (char *) NULL;
             brdptr->motor_in_motion = 0;
-            send_mess(card_index, GET_IDENT, (char) NULL);  /* Read controller ID string */
+            send_mess(card_index, GET_IDENT, (char*) NULL);  /* Read controller ID string */
             recv_mess(card_index, buff, 1);
             strncpy(brdptr->ident, &buff[2], 50);  /* Skip "XD" */
 
@@ -589,7 +589,7 @@ static int motor_init()
                 int axis_name = (int) *PM500_axis_names[total_axis];
                 brdptr->motor_info[total_axis].motor_motion = NULL;
                 sprintf(buff, "%cSTAT?", axis_name);
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
                 recv_mess(card_index, buff, 1);
                 if (buff[1] == 'E')
                     break;
@@ -614,7 +614,7 @@ static int motor_init()
                 double res = 0.0;
 
                 sprintf(buff, "%sCONFIG?", axis_name);
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
                 recv_mess(card_index, buff, 1);
                 firmware = &buff[8];
                 Debug(3, "motor_init: firmware = %s\n", firmware);
diff --git a/motorApp/OmsSrc/devOmsCom.cc b/motorApp/OmsSrc/devOmsCom.cc
index a727bf3e..9641669a 100644
--- a/motorApp/OmsSrc/devOmsCom.cc
+++ b/motorApp/OmsSrc/devOmsCom.cc
@@ -264,7 +264,7 @@ RTN_STATUS oms_build_trans(motor_cmnd command, double *parms, struct motorRecord
                     char respbuf[10];
 
                     (*tabptr->getmsg)(card, respbuf, -1);
-                    (*tabptr->sendmsg)(card, "RB\r", (char) NULL);
+                    (*tabptr->sendmsg)(card, "RB\r", (char*) NULL);
                     (*tabptr->getmsg)(card, respbuf, 1);
                     if (sscanf(respbuf, "%x", &response) == 0)
                         response = 0;   /* Force an error. */
diff --git a/motorApp/OmsSrc/drvMAXv.cc b/motorApp/OmsSrc/drvMAXv.cc
index c895d3b5..fe6bafbe 100644
--- a/motorApp/OmsSrc/drvMAXv.cc
+++ b/motorApp/OmsSrc/drvMAXv.cc
@@ -396,7 +396,7 @@ static int set_status(int card, int signal)
             errlogPrintf(wdctrmsg, card, q_buf);
             status.Bits.RA_PROBLEM = 1;
             motor_info->status.All = status.All;
-            send_mess(card, STOP_ALL, (char) NULL);
+            send_mess(card, STOP_ALL, (char*) NULL);
             /* Disable board. */
             motor_state[card] = (struct controller *) NULL;
             return(rtn_state = 1); /* End move. */
@@ -1261,8 +1261,8 @@ static int motor_init()
         pmotor->status1_irq_enable.All = 0;
         pmotor->status2_irq_enable = 0;
 
-        send_mess(card_index, ERROR_CLEAR, (char) NULL);
-        send_mess(card_index, STOP_ALL, (char) NULL);
+        send_mess(card_index, ERROR_CLEAR, (char*) NULL);
+        send_mess(card_index, STOP_ALL, (char*) NULL);
 
         rtn_code = send_recv_mess(card_index, GET_IDENT, (char) NULL, (char *) pmotorState->ident, 1);
         if (rtn_code != 0)
@@ -1293,7 +1293,7 @@ static int motor_init()
 
         if (wdtrip == false)
         {
-            send_mess(card_index, initstring[card_index], (char) NULL);
+            send_mess(card_index, initstring[card_index], (char*) NULL);
 
             send_recv_mess(card_index, ALL_POS, (char) NULL, axis_pos, 1);
 
diff --git a/motorApp/OmsSrc/drvOms.cc b/motorApp/OmsSrc/drvOms.cc
index 2153deb3..132b27fd 100644
--- a/motorApp/OmsSrc/drvOms.cc
+++ b/motorApp/OmsSrc/drvOms.cc
@@ -1170,16 +1170,16 @@ static int motor_init()
             irqdata->irqEnable = FALSE;
             pmotor->control = IRQ_RESET_ID;
 
-            send_mess(card_index, "EF", (char) NULL);
-            send_mess(card_index, ERROR_CLEAR, (char) NULL);
-            send_mess(card_index, STOP_ALL, (char) NULL);
+            send_mess(card_index, "EF", (char*) NULL);
+            send_mess(card_index, ERROR_CLEAR, (char*) NULL);
+            send_mess(card_index, STOP_ALL, (char*) NULL);
 
-            send_mess(card_index, GET_IDENT, (char) NULL);
+            send_mess(card_index, GET_IDENT, (char*) NULL);
 
             recv_mess(card_index, (char *) pmotorState->ident, 1);
             Debug(3, "Identification = %s\n", pmotorState->ident);
 
-            send_mess(card_index, ALL_POS, (char) NULL);
+            send_mess(card_index, ALL_POS, (char*) NULL);
             recv_mess(card_index, axis_pos, 1);
 
             for (total_axis = 0, pos_ptr = epicsStrtok_r(axis_pos, ",", &tok_save);
diff --git a/motorApp/OmsSrc/drvOms58.cc b/motorApp/OmsSrc/drvOms58.cc
index f729c8bb..21258e9e 100644
--- a/motorApp/OmsSrc/drvOms58.cc
+++ b/motorApp/OmsSrc/drvOms58.cc
@@ -1196,15 +1196,15 @@ static int motor_init()
             pmotor->control.cntrlReg = 0;   /* Disable all interrupts */
             pmotor->rebootind = 0x4321;     /* Set reboot indicator (before send_mess call). */
 
-            send_mess(card_index, "EF", (char) NULL);
-            send_mess(card_index, ERROR_CLEAR, (char) NULL);
-            send_mess(card_index, STOP_ALL, (char) NULL);
+            send_mess(card_index, "EF", (char*) NULL);
+            send_mess(card_index, ERROR_CLEAR, (char*) NULL);
+            send_mess(card_index, STOP_ALL, (char*) NULL);
 
-            send_mess(card_index, GET_IDENT, (char) NULL);
+            send_mess(card_index, GET_IDENT, (char*) NULL);
             recv_mess(card_index, (char *) pmotorState->ident, 1);
             Debug(3, "Identification = %s\n", pmotorState->ident);
 
-            send_mess(card_index, ALL_POS, (char) NULL);
+            send_mess(card_index, ALL_POS, (char*) NULL);
             recv_mess(card_index, axis_pos, 1);
 
             for (total_axis = 0, pos_ptr = epicsStrtok_r(axis_pos, ",", &tok_save);
diff --git a/motorApp/OmsSrc/drvOmsPC68.cc b/motorApp/OmsSrc/drvOmsPC68.cc
index f88eb748..1582ccdd 100644
--- a/motorApp/OmsSrc/drvOmsPC68.cc
+++ b/motorApp/OmsSrc/drvOmsPC68.cc
@@ -770,7 +770,7 @@ static int motor_init()
             /* Try 3 times to connect to controller. */
             do
             {
-                send_mess (card_index, GET_IDENT, (char) NULL);
+                send_mess (card_index, GET_IDENT, (char*) NULL);
                 status = recv_mess(card_index, (char *) pmotorState->ident, 1);
                 retry++;
             } while (status == 0 && retry < 3);
@@ -783,11 +783,11 @@ static int motor_init()
             pmotorState->motor_in_motion = 0;
             pmotorState->cmnd_response = false;
 
-            send_mess (card_index, ECHO_OFF, (char) NULL);
-            send_mess (card_index, ERROR_CLEAR, (char) NULL);
-            send_mess (card_index, STOP_ALL, (char) NULL);
+            send_mess (card_index, ECHO_OFF, (char*) NULL);
+            send_mess (card_index, ERROR_CLEAR, (char*) NULL);
+            send_mess (card_index, STOP_ALL, (char*) NULL);
 
-            send_mess (card_index, ALL_POS, (char) NULL);
+            send_mess (card_index, ALL_POS, (char*) NULL);
             recv_mess (card_index, axis_pos, 1);
 
             for (total_axis = 0, pos_ptr = epicsStrtok_r(axis_pos, ",", &tok_save);
@@ -822,7 +822,7 @@ static int motor_init()
              * dummy communication transaction.
              */
 
-            send_mess (card_index, ALL_POS, (char) NULL);
+            send_mess (card_index, ALL_POS, (char*) NULL);
             recv_mess (card_index, axis_pos, 1);
 
             for (motor_index=0;motor_index<total_axis;motor_index++)
diff --git a/motorApp/OrielSrc/drvEMC18011.cc b/motorApp/OrielSrc/drvEMC18011.cc
index 0cde02a0..ae1313b7 100644
--- a/motorApp/OrielSrc/drvEMC18011.cc
+++ b/motorApp/OrielSrc/drvEMC18011.cc
@@ -381,7 +381,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
         strncpy(send_buff, nodeptr->postmsgptr, 80);
-	send_mess(card, send_buff, (char) NULL);
+	send_mess(card, send_buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
diff --git a/motorApp/PC6KSrc/drvPC6K.cc b/motorApp/PC6KSrc/drvPC6K.cc
index b9a8e53d..7da4fb9f 100644
--- a/motorApp/PC6KSrc/drvPC6K.cc
+++ b/motorApp/PC6KSrc/drvPC6K.cc
@@ -431,7 +431,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
         strncpy(send_buff, nodeptr->postmsgptr, 80);
-	send_mess(card, send_buff, (char) NULL);
+	send_mess(card, send_buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
@@ -704,12 +704,12 @@ PC6KUpLoad(int card,               /* Controller Number */
 	/* Copy file into PC6K Program */
 	sprintf(nextLine, "DEL %s", progName);
 	// recvCnt = send_recv_mess(card, nextLine, replyBuff);
-	send_mess(card, nextLine, (char) NULL);
+	send_mess(card, nextLine, (char*) NULL);
 	// eos_ptr = eos_str;
 	sprintf(nextLine, "DEF %s", progName);
 	// recvCnt = send_recv_mess(card, nextLine, replyBuff, eos_ptr);
 	// recvCnt = send_recv_mess(card, nextLine, replyBuff);
-	send_mess(card, nextLine, (char) NULL);
+	send_mess(card, nextLine, (char*) NULL);
       }
 
     while (fgets(nextLine, BUFF_SIZE, fd) != NULL)
@@ -721,7 +721,7 @@ PC6KUpLoad(int card,               /* Controller Number */
 	
 	// recvCnt = send_recv_mess(card, nextLine, replyBuff, eos_ptr);
 	// recvCnt = send_recv_mess(card, nextLine, replyBuff);
-	send_mess(card, nextLine, (char) NULL);
+	send_mess(card, nextLine, (char*) NULL);
       }
 
     fclose(fd);
@@ -729,7 +729,7 @@ PC6KUpLoad(int card,               /* Controller Number */
     if (progName && strlen(progName))
 	/* End PC6K Program */
         // recvCnt = send_recv_mess(card, "END", replyBuff);
-        send_mess(card, "END", (char) NULL);
+        send_mess(card, "END", (char*) NULL);
 
     return(OK);
 }
@@ -832,7 +832,7 @@ static int motor_init()
 	    } while (!recvCnt && ++retryCnt < 3);
 
 
-	    /* send_mess(card_index, COMEXEC_ENA, (char) NULL); */   /* Enable continuous commands */
+	    /* send_mess(card_index, COMEXEC_ENA, (char*) NULL); */   /* Enable continuous commands */
 	    send_recv_mess(card_index, COMEXEC_ENA, buff);   /* Enable continuous commands */
 	    // send_recv_mess(card_index, CMD_SCALE, buff);     /* Enable scaling  - unary */
 
diff --git a/motorApp/PiJenaSrc/drvPIJEDS.cc b/motorApp/PiJenaSrc/drvPIJEDS.cc
index f15f3724..9f18c38b 100644
--- a/motorApp/PiJenaSrc/drvPIJEDS.cc
+++ b/motorApp/PiJenaSrc/drvPIJEDS.cc
@@ -390,7 +390,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
 	strcpy(buff, nodeptr->postmsgptr);
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
@@ -612,7 +612,7 @@ static int motor_init()
 	    {
 	      online = false;
 	      /* Set Controller to ONLINE mode */
-	      send_mess(card_index, GET_IDENT, (char) NULL);
+	      send_mess(card_index, GET_IDENT, (char*) NULL);
 	      if ((status = recv_mess(card_index, buff, 1)))
 		online = (strstr(buff,"DSM")) ? true : false;
 	      else
diff --git a/motorApp/PiSrc/drvPIC662.cc b/motorApp/PiSrc/drvPIC662.cc
index 18752c66..93004210 100644
--- a/motorApp/PiSrc/drvPIC662.cc
+++ b/motorApp/PiSrc/drvPIC662.cc
@@ -231,7 +231,7 @@ static int set_status(int card, int signal)
     nodeptr = motor_info->motor_motion;
     status.All = motor_info->status.All;
 
-    send_mess(card, GET_STATUS, (char) NULL);
+    send_mess(card, GET_STATUS, (char*) NULL);
     comm_status = recv_mess(card, buff, 1);
     if (comm_status == 0)
     {
@@ -270,7 +270,7 @@ static int set_status(int card, int signal)
      * Skip to substring for this motor, convert to double
      */
 
-    send_mess(card, GET_POS, (char) NULL);
+    send_mess(card, GET_POS, (char*) NULL);
     recv_mess(card, buff, 1);
 
     motorData = NINT (atof(buff) / cntrl->drive_resolution);
@@ -339,7 +339,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
 	strcpy(buff, nodeptr->postmsgptr);
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
@@ -538,7 +538,7 @@ static int motor_init()
 
 	    do
 	    {
-		send_mess(card_index, GET_IDENT, (char) NULL);
+		send_mess(card_index, GET_IDENT, (char*) NULL);
 		status = recv_mess(card_index, buff, 1);
                 retry++;
 	    } while (status == 0 && retry < 3);
@@ -557,7 +557,7 @@ static int motor_init()
 
 
 	    /* Set Controller to REMOTE mode */
-     	    send_mess(card_index, REMOTE_MODE, (char) NULL);
+     	    send_mess(card_index, REMOTE_MODE, (char*) NULL);
 
 	    {
 	        struct mess_info *motor_info = &brdptr->motor_info[0];
diff --git a/motorApp/PiSrc/drvPIC663.cc b/motorApp/PiSrc/drvPIC663.cc
index 379e5168..532494fd 100644
--- a/motorApp/PiSrc/drvPIC663.cc
+++ b/motorApp/PiSrc/drvPIC663.cc
@@ -214,7 +214,7 @@ static int set_status(int card, int signal)
     if (cntrl->status != NORMAL)
 	charcnt = recv_mess(card, buff, FLUSH);
 
-    send_mess(card, "TS", (char) NULL);		/*  Tell Status */
+    send_mess(card, "TS", (char*) NULL);		/*  Tell Status */
     charcnt = recv_mess(card, buff, 1);
     if (charcnt > 9)
 	convert_cnt = sscanf(buff, "S:%2hx %2hx %2hx\n", 
@@ -255,7 +255,7 @@ static int set_status(int card, int signal)
     minusLS = mstat2.Bits.lo_limit ? 0 : 1;
 
    /* Parse motor position */
-    send_mess(card, "TP", (char) NULL);  /*  Tell Position */
+    send_mess(card, "TP", (char*) NULL);  /*  Tell Position */
     recv_mess(card, buff, 1);
     motorData = NINT(atof(&buff[2]));
      
@@ -309,7 +309,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
 	strcpy(buff, nodeptr->postmsgptr);
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
@@ -521,7 +521,7 @@ static int motor_init()
 	    do
 	    {
                 sprintf(buff,"\001%1XVE", cntrl->asyn_address);
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
 		status = recv_mess(card_index, buff, 1);
 		retry++;
 	    } while (status == 0 && retry < 3);
diff --git a/motorApp/PiSrc/drvPIC844.cc b/motorApp/PiSrc/drvPIC844.cc
index 457841ef..ae873800 100644
--- a/motorApp/PiSrc/drvPIC844.cc
+++ b/motorApp/PiSrc/drvPIC844.cc
@@ -264,7 +264,7 @@ static int set_status(int card, int signal)
     cntrl->status = NORMAL;
     status.Bits.CNTRL_COMM_ERR = 0;
 
-    send_mess(card, "MOT:COND?", (char) NULL);
+    send_mess(card, "MOT:COND?", (char*) NULL);
     recv_mess(card, buff, 1);
 
     mstat.All = atoi(&buff[0]);
@@ -295,7 +295,7 @@ static int set_status(int card, int signal)
      * Skip to substring for this motor, convert to double
      */
 
-    send_mess(card, "CURR:TPOS?", (char) NULL);
+    send_mess(card, "CURR:TPOS?", (char*) NULL);
     recv_mess(card, buff, 1);
 
     motorData = atof(buff);
@@ -364,7 +364,7 @@ static int set_status(int card, int signal)
     status.Bits.EA_SLIP_STALL = 0;
     status.Bits.EA_HOME	      = 0;
 
-    send_mess(card, "AXIS:POS?", (char) NULL);
+    send_mess(card, "AXIS:POS?", (char*) NULL);
     recv_mess(card, buff, 1);
     motorData = atof(buff);
     motor_info->encoder_position = (epicsInt32) motorData;
@@ -387,7 +387,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
 	strcpy(buff, nodeptr->postmsgptr);
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
@@ -596,7 +596,7 @@ static int motor_init()
 
 	    do
 	    {
-		send_mess(card_index, GET_IDENT, (char) NULL);
+		send_mess(card_index, GET_IDENT, (char*) NULL);
 		status = recv_mess(card_index, buff, 1);
                 retry++;
 	    } while (status == 0 && retry < 3);
diff --git a/motorApp/PiSrc/drvPIC848.cc b/motorApp/PiSrc/drvPIC848.cc
index dd533b3d..8aba08c4 100644
--- a/motorApp/PiSrc/drvPIC848.cc
+++ b/motorApp/PiSrc/drvPIC848.cc
@@ -341,7 +341,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
 	strcpy(buff, nodeptr->postmsgptr);
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
@@ -548,7 +548,7 @@ static int motor_init()
 
 	    do
 	    {
-		send_mess(card_index, GET_IDENT, (char) NULL);
+		send_mess(card_index, GET_IDENT, (char*) NULL);
 		status = recv_mess(card_index, buff, 1);
 		retry++;
 	    } while (status == 0 && retry < 3);
diff --git a/motorApp/PiSrc/drvPIC862.cc b/motorApp/PiSrc/drvPIC862.cc
index 683f20eb..241e0081 100644
--- a/motorApp/PiSrc/drvPIC862.cc
+++ b/motorApp/PiSrc/drvPIC862.cc
@@ -225,7 +225,7 @@ static int set_status(int card, int signal)
     if (cntrl->status != NORMAL)
 	charcnt = recv_mess(card, buff, FLUSH);
 
-    send_mess(card, "TS", (char) NULL);		/*  Tell Status */
+    send_mess(card, "TS", (char*) NULL);		/*  Tell Status */
     charcnt = recv_mess(card, buff, 1);
     if (charcnt > 18)
 	convert_cnt = sscanf(buff, "S:%2hx %2hx %2hx %2hx %2hx %2hx\n", 
@@ -281,7 +281,7 @@ static int set_status(int card, int signal)
 
 
    /* Parse motor position */
-    send_mess(card, "TP", (char) NULL);  /*  Tell Position */
+    send_mess(card, "TP", (char*) NULL);  /*  Tell Position */
     recv_mess(card, buff, 1);
     motorData = NINT(atof(&buff[2]));
      
@@ -335,7 +335,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
 	strcpy(buff, nodeptr->postmsgptr);
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
@@ -547,7 +547,7 @@ static int motor_init()
 	    do
 	    {
                 sprintf(buff,"\001%1XVE", cntrl->asyn_address);
-                send_mess(card_index, buff, (char) NULL);
+                send_mess(card_index, buff, (char*) NULL);
 		status = recv_mess(card_index, buff, 1);
 		retry++;
 	    } while (status == 0 && retry < 3);
diff --git a/motorApp/PiSrc/drvPIE516.cc b/motorApp/PiSrc/drvPIE516.cc
index 1494a581..847db296 100644
--- a/motorApp/PiSrc/drvPIE516.cc
+++ b/motorApp/PiSrc/drvPIE516.cc
@@ -243,14 +243,14 @@ static int set_status(int card, int signal)
     recv_mess(card, buff, FLUSH);
 
     readOK = false;   
-    send_mess(card, READ_ONLINE, (char) NULL);
+    send_mess(card, READ_ONLINE, (char*) NULL);
     if (recv_mess(card, buff, 1) && sscanf(buff, "%d", &online_status))
       {
 	if (!online_status)
 	  {
 	    /* Assume Controller Reboot - Set ONLINE and Velocity Control ON */
-	    send_mess(card, SET_ONLINE, (char) NULL);
-	    send_mess(card, SET_VELCTRL, (char) NULL);
+	    send_mess(card, SET_ONLINE, (char*) NULL);
+	    send_mess(card, SET_VELCTRL, (char*) NULL);
 	  }
 
 	send_mess(card, READ_ONTARGET, PIE516_axis[signal]);
@@ -367,7 +367,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
 	strcpy(buff, nodeptr->postmsgptr);
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
@@ -585,15 +585,15 @@ static int motor_init()
 	    {
 	      online = false;
 	      /* Set Controller to ONLINE mode */
-	      send_mess(card_index, SET_ONLINE, (char) NULL);
-	      send_mess(card_index, READ_ONLINE, (char) NULL);
+	      send_mess(card_index, SET_ONLINE, (char*) NULL);
+	      send_mess(card_index, READ_ONLINE, (char*) NULL);
 	      if ((status = recv_mess(card_index, buff, 1)))
 		online = (atoi(buff)==1) ? true : false;
 	      else
 		retry++;
 	    } while (online == false && retry < 3);
 
-	    send_mess(card_index, GET_IDENT, (char) NULL);
+	    send_mess(card_index, GET_IDENT, (char*) NULL);
 	    status = recv_mess(card_index, buff, 1);
 	    
 	    /* Parse out E516 revision (2 decimal places) and convert to int */
@@ -626,7 +626,7 @@ static int motor_init()
 	    brdptr->total_axis = total_axis;
 
 	    /* Turn ON velocity control mode  - All axis */
-	    send_mess(card_index, SET_VELCTRL, (char) NULL);
+	    send_mess(card_index, SET_VELCTRL, (char*) NULL);
 
 	    for (motor_index = 0; motor_index < total_axis; motor_index++)
 	    {
diff --git a/motorApp/PiSrc/drvPIE517.cc b/motorApp/PiSrc/drvPIE517.cc
index 5ba40cb9..9e3b2b4f 100755
--- a/motorApp/PiSrc/drvPIE517.cc
+++ b/motorApp/PiSrc/drvPIE517.cc
@@ -256,7 +256,7 @@ static int set_status(int card, int signal)
 //	  {
 //	    /* Assume Controller Reboot - Set ONLINE and Velocity Control ON */
 //	    send_mess(card, SET_ONLINE, PIE517_axis[signal]);
-//	    //send_mess(card, SET_VELCTRL, (char) NULL);
+//	    //send_mess(card, SET_VELCTRL, (char*) NULL);
 //	  }
 
 	send_mess(card, READ_ONTARGET, PIE517_axis[signal]);
@@ -372,7 +372,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
 	strcpy(buff, nodeptr->postmsgptr);
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
@@ -595,15 +595,15 @@ static int motor_init()
 	    //{
 	    //  online = false;
 	    //  /* Set Controller to ONLINE mode */
-	    //  send_mess(card_index, SET_ONLINE, (char) NULL);
-	    //  send_mess(card_index, READ_ONLINE, (char) NULL);
+	    //  send_mess(card_index, SET_ONLINE, (char*) NULL);
+	    //  send_mess(card_index, READ_ONLINE, (char*) NULL);
 	    //  if ((status = recv_mess(card_index, buff, 1)))
 		//online = (atoi(buff)==1) ? true : false;
 	    //  else
 		//retry++;
 	    //} while (online == false && retry < 3);
 
-	    //send_mess(card_index, GET_IDENT, (char) NULL);
+	    //send_mess(card_index, GET_IDENT, (char*) NULL);
 	    //status = recv_mess(card_index, buff, 1);
 	    
 	    /* Parse out E517 revision (2 decimal places) and convert to int */
@@ -636,7 +636,7 @@ static int motor_init()
 	    brdptr->total_axis = total_axis;
 
 	    /* Turn ON velocity control mode  - All axis */
-	    //send_mess(card_index, SET_VELCTRL, (char) NULL);
+	    //send_mess(card_index, SET_VELCTRL, (char*) NULL);
 
 	    for (motor_index = 0; motor_index < total_axis; motor_index++)
 	    {
diff --git a/motorApp/PiSrc/drvPIE710.cc b/motorApp/PiSrc/drvPIE710.cc
index f81e44e3..d5221b40 100644
--- a/motorApp/PiSrc/drvPIE710.cc
+++ b/motorApp/PiSrc/drvPIE710.cc
@@ -351,7 +351,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
 	strcpy(buff, nodeptr->postmsgptr);
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
@@ -560,7 +560,7 @@ static int motor_init()
 
 	    do
 	    {
-		send_mess(card_index, GET_IDENT, (char) NULL);
+		send_mess(card_index, GET_IDENT, (char*) NULL);
 		status = recv_mess(card_index, buff[0], 1);
 
 		/* Parse out E710 revision (3 decimal places) and convert to int */
diff --git a/motorApp/PiSrc/drvPIE816.cc b/motorApp/PiSrc/drvPIE816.cc
index 6b9dd0e0..d08d0117 100644
--- a/motorApp/PiSrc/drvPIE816.cc
+++ b/motorApp/PiSrc/drvPIE816.cc
@@ -252,14 +252,14 @@ static int set_status(int card, int signal)
     recv_mess(card, buff, FLUSH);
 
     readOK = false;   
-    //send_mess(card, READ_ONLINE, (char) NULL);
+    //send_mess(card, READ_ONLINE, (char*) NULL);
 /*    if (recv_mess(card, buff, 1) && sscanf(buff, "%d", &online_status))
       {
 	if (!online_status)
 	  {
 	    *//* Assume Controller Reboot - Set ONLINE and Velocity Control ON */
-	    /*send_mess(card, SET_ONLINE, (char) NULL);
-	    send_mess(card, SET_VELCTRL, (char) NULL);
+	    /*send_mess(card, SET_ONLINE, (char*) NULL);
+	    send_mess(card, SET_VELCTRL, (char*) NULL);
 	  }
 */
 	send_mess(card, READ_ONTARGET, PIE816_axis[signal]);
@@ -377,7 +377,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
 	strcpy(buff, nodeptr->postmsgptr);
-	send_mess(card, buff, (char) NULL);
+	send_mess(card, buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }
 
@@ -597,15 +597,15 @@ static int motor_init()
 	      online = false;
 */
 	      /* Set Controller to ONLINE mode */
-/*	      send_mess(card_index, SET_ONLINE, (char) NULL);
-	      send_mess(card_index, READ_ONLINE, (char) NULL);
+/*	      send_mess(card_index, SET_ONLINE, (char*) NULL);
+	      send_mess(card_index, READ_ONLINE, (char*) NULL);
 	      if ((status = recv_mess(card_index, buff, 1)))
 		online = (atoi(buff)==1) ? true : false;
 	      else
 		retry++;
 	    } while (online == false && retry < 3);
 */
-	    send_mess(card_index, GET_IDENT, (char) NULL);
+	    send_mess(card_index, GET_IDENT, (char*) NULL);
 	    status = recv_mess(card_index, buff, 1);
 	    
 	    /* Parse out E816 revision (2 decimal places) and convert to int */
@@ -639,7 +639,7 @@ static int motor_init()
 	    brdptr->total_axis = total_axis;
 
 	    /* Turn ON velocity control mode  - All axis */
-	    /*send_mess(card_index, SET_VELCTRL, (char) NULL);*/
+	    /*send_mess(card_index, SET_VELCTRL, (char*) NULL);*/
 
 	    for (motor_index = 0; motor_index < total_axis; motor_index++)
 	    {
diff --git a/motorApp/ThorLabsSrc/drvMDT695.cc b/motorApp/ThorLabsSrc/drvMDT695.cc
index 34c60d0e..ab2c8013 100644
--- a/motorApp/ThorLabsSrc/drvMDT695.cc
+++ b/motorApp/ThorLabsSrc/drvMDT695.cc
@@ -334,7 +334,7 @@ static int set_status(int card, int signal)
 	nodeptr->postmsgptr != 0)
     {
         strncpy(send_buff, nodeptr->postmsgptr, 80);
-	send_mess(card, send_buff, (char) NULL);
+	send_mess(card, send_buff, (char*) NULL);
 	nodeptr->postmsgptr = NULL;
     }