diff --git a/src/drv/drvGpib.c b/src/drv/drvGpib.c
index 4be758fbf..3196b97ec 100644
--- a/src/drv/drvGpib.c
+++ b/src/drv/drvGpib.c
@@ -1988,7 +1988,11 @@ int	time;
   {
     bbdpvt.rxMaxLen = length > BB_MAX_DAT_LEN ? BB_MAX_DAT_LEN+7 : length+7;
     bbdpvt.ageLimit = 0;
-    (*(drvBitBus.qReq))(&bbdpvt, BB_Q_LOW);
+    if ((*(drvBitBus.qReq))(&bbdpvt, BB_Q_LOW) != OK)
+    {
+      bbdpvt.status = BB_NONODE;
+      return(ERROR);
+    }
     semTake(*(bbdpvt.psyncSem), WAIT_FOREVER);	/* wait for response */
 
     if (ibDebug || bbibDebug)
@@ -2076,7 +2080,11 @@ int	time;
     }
 
     bbdpvt.ageLimit = 0;
-    (*(drvBitBus.qReq))(&bbdpvt, BB_Q_HIGH);
+    if ((*(drvBitBus.qReq))(&bbdpvt, BB_Q_HIGH) != OK)
+    {
+      bbdpvt.status = BB_NONODE;
+      return(ERROR);
+    }
     semTake(*(bbdpvt.psyncSem), WAIT_FOREVER);	/* wait for response */
 
     if (ibDebug || bbibDebug)
@@ -2126,7 +2134,11 @@ int     length;
   {
     bbdpvt.txMsg.length = BB_MAX_DAT_LEN+7;	/* send a chunk */
     bbdpvt.ageLimit = 0;
-    (*(drvBitBus.qReq))(&bbdpvt, BB_Q_HIGH);
+    if ((*(drvBitBus.qReq))(&bbdpvt, BB_Q_HIGH) != OK)
+    {
+      bbdpvt.status = BB_NONODE;
+      return(ERROR);
+    }
     semTake(*(bbdpvt.psyncSem), WAIT_FOREVER);	/* wait for response */
 
     length -= BB_MAX_DAT_LEN;			/* ready for next chunk */
@@ -2136,7 +2148,11 @@ int     length;
   {
     bbdpvt.txMsg.length = length+7;		/* send the last chunk */
     bbdpvt.ageLimit = 0;
-    (*(drvBitBus.qReq))(&bbdpvt, BB_Q_HIGH);
+    if ((*(drvBitBus.qReq))(&bbdpvt, BB_Q_HIGH) != OK)
+    {
+      bbdpvt.status = BB_NONODE;
+      return(ERROR);
+    }
     semTake(*(bbdpvt.psyncSem), WAIT_FOREVER);	/* wait for response */
 /* BUG -- check bitbus response */
   }
@@ -2257,7 +2273,11 @@ bbGpibIoctl(int link, int bug, int cmd, int v, caddr_t p)
       bbDpvt.ageLimit = 0;
   
       /* send it to the bug */
-      (*(drvBitBus.qReq))(&bbDpvt, BB_Q_HIGH);
+      if ((*(drvBitBus.qReq))(&bbDpvt, BB_Q_HIGH) != OK)
+      {
+        bbDpvt.status = BB_NONODE;
+        return(ERROR);
+      }
       semTake(*(bbDpvt.psyncSem), WAIT_FOREVER);	/* wait for finish */
       if ((bbDpvt.status == BB_OK) && (!(bbDpvt.rxMsg.cmd & BB_IBSTAT_TMO)))
         stat = OK;
@@ -2286,7 +2306,11 @@ bbGpibIoctl(int link, int bug, int cmd, int v, caddr_t p)
       bbDpvt.ageLimit = 0;
   
       /* send it to the bug */
-      (*(drvBitBus.qReq))(&bbDpvt, BB_Q_HIGH);
+      if ((*(drvBitBus.qReq))(&bbDpvt, BB_Q_HIGH) != OK)
+      {
+        bbDpvt.status = BB_NONODE;
+        return(ERROR);
+      }
       semTake(*(bbDpvt.psyncSem), WAIT_FOREVER);	/* wait for finish */
       if ((bbDpvt.status == BB_OK) && (!(bbDpvt.rxMsg.cmd & BB_IBSTAT_TMO)))
         stat = OK;