Fixed endless loop when communication times out and added

diagnostics.

src/turboPmacAxis.cpp

@@ -161,7 +161,15 @@ asynStatus turboPmacAxis::init() {
              axisNo_, axisNo_, axisNo_, axisNo_, axisNo_);
     status = pC_->writeRead(axisNo_, command, response, 6);
     if (status != asynSuccess) {
-        return status;
+        asynPrint(
+            pC_->pasynUser(), ASYN_TRACE_ERROR,
+            "Controller \"%s\", axis %d => %s, line %d\nCould not communicate "
+            "with controller during IOC initialization. Check if you used "
+            "\"pmacAsynIPPortConfigure\" instead of the standard "
+            "\"drvAsynIPPortConfigure\" function in the .cmd file in order to "
+            "create the port driver.\nTerminating IOC.\n",
+            pC_->portName, axisNo(), __PRETTY_FUNCTION__, __LINE__);
+        exit(-1);
     }
     nvals = sscanf(response, "%d %lf %lf %lf %lf %d", &axStatus, &motorPos,
                    &motorVmax, &motorVelocity, &motorAccel, &acoDelay);