diff --git a/motorApp/MclennanSrc/drvPM304.h b/motorApp/MclennanSrc/drvPM304.h
index ed3b7997..c2c39053 100644
--- a/motorApp/MclennanSrc/drvPM304.h
+++ b/motorApp/MclennanSrc/drvPM304.h
@@ -13,26 +13,34 @@
  * -----------------
  * .01  11/20/98  mlr  initialized from drvMM4000.h
  * .02  09/29/99  mlr  re-wrote for new version of motor software (V4)
+ * .03  02/11/03  mlr  Added support for PM600 model
  */
 
 #ifndef	INCdrvPM304h
 #define	INCdrvPM304h 1
 
 #include "motordrvCom.h"
+#include "serialIO.h"
 
 /* PM304 default profile. */
 
 #define PM304_NUM_CARDS           4
-#define PM304_NUM_CHANNELS        1
+#define PM304_MAX_CHANNELS        10
+
+#define MODEL_PM304 0
+#define MODEL_PM600 1
 
 #define OUTPUT_TERMINATOR "\r"
-#define INPUT_TERMINATOR  '\n'
+#define INPUT_TERMINATOR  (char *) "\n"
 
 struct PM304controller
 {
-    void *serialInfo;       /* For RS-232 */
+    serialIO *serialInfo;   /* For RS-232 */
     int serial_card;        /* Card on which Hideos/MPF is running */
     char serial_task[20];   /* Hideos/MPF task/server name for serial port */
+    int n_axes;             /* Number of axes on this controller */
+    int model;              /* Model = MODEL_PM304 or MODEL_PM600 */
+    int use_encoder[PM304_MAX_CHANNELS];  /* Does axis have an encoder? */
 };
 
 #endif	/* INCdrvPM304h */