I’m confused

2208e comms problem

I have a 2208e temperature controller with a bisynch comms module which i'm communicating to via serial port (using labview). Certain commands work fine (ask for temperature, change setpoint etc.), but some commands don't seem to work - for instance i can change the proportional gain, but when i try and change the integral or differential gain it doesn't work. Similarly, i can go from Auto-manual mode, but not back again! Any ideas what i'm doing wrong? The code i'm using is copied directly from a 2400 series on another system where it works perfectly.
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