diff --git a/dsmApp/src/MD90Driver.cpp b/dsmApp/src/MD90Driver.cpp
index 33d0181..db5907a 100644
--- a/dsmApp/src/MD90Driver.cpp
+++ b/dsmApp/src/MD90Driver.cpp
@@ -185,7 +185,7 @@ asynStatus MD90Axis::sendAccelAndVelocity(double acceleration, double velocity)
   // Velocity provided in steps/sec
   // Our unit step size of the encoder is 10 nm, but the motor moves in steps approx. 5 micrometers.
   // Motor controller accepts step frequency in Hz.
-  freq = NINT(fabs(velocity / COUNTS_PER_STEP));
+  freq = NINT(fabs(velocity / 500.));
   sprintf(pC_->outString_, "SSF %d", freq);
   status = pC_->writeReadController();
   if (!status) {
@@ -446,7 +446,7 @@ asynStatus MD90Axis::poll(bool *moving)
   if (comStatus) goto skip;
   // The response string is of the form "0: Current step frequency: 100"
   sscanf(pC_->inString_, "%d: %[^:]: %d", &replyStatus, replyString, &replyValue);
-  velocity = replyValue * COUNTS_PER_STEP;
+  velocity = replyValue * 500.0;
   setDoubleParam(pC_->motorVelocity_, velocity);
 
   // Read the current motor integral gain (range 1-1000)
diff --git a/dsmApp/src/MD90Driver.h b/dsmApp/src/MD90Driver.h
index 80e1859..0b1e056 100644
--- a/dsmApp/src/MD90Driver.h
+++ b/dsmApp/src/MD90Driver.h
@@ -2,6 +2,9 @@
 FILENAME...   MD90Driver.h
 USAGE...      Motor driver support for the DSM MD-90 controller.
 
+Mark Rivers
+March 1, 2012
+
 */
 
 #include "asynMotorController.h"
@@ -12,8 +15,6 @@ USAGE...      Motor driver support for the DSM MD-90 controller.
 // No controller-specific parameters yet
 #define NUM_MD90_PARAMS 0  
 
-#define COUNTS_PER_STEP    1000.0
-
 class epicsShareClass MD90Axis : public asynMotorAxis
 {
 public: