BasicMicro

Thank you for your reply. I have attached an extract of code that will show methodology plus results. I embedded some code to print to the debug screen as the code was running and it shows the command info plus whether the command gave an ack result or not. Some of the commands could be in doubt as ...

"Drive M1, M2 or both with Signed Speed and Accel". I seem to have found a situation where these particular commands are working fine but failing to return the &HFF flag. My command line uses 'AND' &HFF to set the 8th bit above the normal checksum. Works fine for most of my command...