diff --git a/dsmApp/src/MD90Driver.cpp b/dsmApp/src/MD90Driver.cpp
index 52dc57a..2e02278 100644
--- a/dsmApp/src/MD90Driver.cpp
+++ b/dsmApp/src/MD90Driver.cpp
@@ -248,6 +248,22 @@ asynStatus MD90Axis::setClosedLoop(bool closedLoop)
   return status;
 }
 
+/** Set the I Gain of the motor control loop.  The motor is an I- controller
+  * and has no P or D terms.
+  * \param[in] iGain The current I gain in the control loop */
+asynStatus MD90Axis::setIGain(double iGain)
+{
+  asynStatus status;
+  //static const char *functionName = "MD90Axis::setIGain";
+
+  iGain = iGain * 100;
+  if (iGain < 1) iGain = 1.0;
+  if (iGain > 100) iGain = 100.0;
+  sprintf(pC_->outString_, "SGN %d", NINT(iGain));
+  status = pC_->writeReadController();
+  return status;
+}
+
 /** Polls the axis.
   * This function reads the motor position, the limit status, the home status, the moving status, 
   * and the drive power-on status. 
diff --git a/dsmApp/src/MD90Driver.h b/dsmApp/src/MD90Driver.h
index 28717cc..5062b4f 100644
--- a/dsmApp/src/MD90Driver.h
+++ b/dsmApp/src/MD90Driver.h
@@ -27,6 +27,7 @@ public:
   asynStatus stop(double acceleration);
   asynStatus poll(bool *moving);
   asynStatus setClosedLoop(bool closedLoop);
+  asynStatus setIGain(double iGain);
 
 private:
   MD90Controller *pC_;          /**< Pointer to the asynMotorController to which this axis belongs.