Good evening everyone,
I'm writing this post after hours of troubleshooting and really require some help. I am working on a collegiate project creating a LabView program for a MKS mass flow controller.
I have so far created a program that controls the set point, the flow scale, and a drop down for the necessary gasses.
I bought a NI USB 6001 and a RS232 cable to bare wire, to both send a 0-5v signal to generate the set point and to read a 0-5v signal from the flow signal output.
However, after attempting to test the program in our college lab, I can't seem to get the MFC to activate at all, it doesn't seem to pushing out any gas. I am not sure if its due to the LabView Code or the wiring.
I am connecting the pins of the rs232 cable db 15 to barewire to the NI USB 6001 as follows:
pin 2 - AI 0 of NI USB 6001 ( Flow signal Output) (Final plan is to connect to a breadboard and run across a 10k ohm resistor and then connect to AI 0, but as of now just trying to obtain a signal)
pin 4 - Connected to the constant 5v digital output of the NI USB 6001 (MFC Valve open) (This I'm skeptical if it works since the NI USB 6001 is busy generating and reading signals, I have no idea if this digital output continues to generate 5v. In addition, I'm not sure that 5v is enough to open the valve since the range is 5v to 15v)
pin 7 - Positive terminal of power supply (A power supply is needed to power the MFC since it takes 15v to 24v)
pin 8 - AO 0 of NI USB 6001 (Setpoint Input)
pin 15 - negative terminal of power supply (MFC Chassis ground, i'm not sure if this is the correct ground to use)
I apologize if these are dumb questions as I am a beginner to LabView and have had no other experience utilizing the program besides this project. Below I have attached my VI and a picture of the MFC pin out from the manual.