3D Compass DCM302B commands

I am Testing serial communication by using PL2303 (serial to usb ttl) and compass Rion DCM302B.
when i executed the calibration command, i was getting response from device. but when i tried other commands like declination and setting module address and so on, now my device is not responding on any of the command. what can i do to resolve this matter??

Hello,

As neither of those are Pololu products, I’d recommend asking the manufacturer of your compass and/or serial adapter since they should be able to give you more specific advice. (I moved your post to the more general electronics discussion section of the forum.)

Kevin