Experimental Physics and
Industrial Control System

 

Is there a way to make checksums lower case?

I'm working on streamdevice support for the TE Technology TC-48-20 temperature controller. It uses the checksum that is coded as %01<sum8> in streamdevice format converter. If the checksum contains letters, they are upper case A-F. It works fine when the checksum value only contains 0-9, but the controller rejects any checksum with A-F. I tried hard coding a checksum from a command it had rejected, but making the checksum value lower case, *5e00005A -> *5e00005a, and the controller accepted it. That's fine for requesting values, but I can't hard code the checksum for setting values. Any ideas?

Thanks,

Garth