Attached to this discussion is my script. So lately, I've been working on connecting 2 dual channel chemyx syringe pumps. I managed to control them each channel independently using my script. Each channel works perfectly, the only issue I'm having is that every time I put the volume input it would not change in the pump but my rate would. for example if i put in my software vol= 500ul @3.5ul/min, in the pump would only change the rate. besides that, in pump one channel 1 works perfectly but channel 2 of pump one is the one having the problem stated. in pump 2 channel 2 is the one who has the problem stated before too.