DB-25 slave to Mettler M400

[questioneronfile777]

I want to use PID control for a pH control loop. pH goes down, pump turn on. I have a Masterflex l/s with a DB-25 cable that I want to connect to a Mettler M400. The pH probe is already functional. I am not sure how to wire this pump for proper functionality.

[rolfk · Accepted solution]

That’s definitely a question for Mettler Toledo technical support.