I’ve made some progress on this. It seems that the VCP appears as /dev/ttyACM0, which means I can open a PuTTY session using this as the serial line without getting a fatal error message. However, I can’t send anything from PuTTY to the Gumstix. If I send from the command line e.g. echo ‘some_command’ > /dev/ttyACM0 , my receiver sees ‘some_command’ plus whatever I previously had typed into PuTTY . I think PuTTY might be failing to send \n which my receiver needs to start processing a command. I’ve tried Implicit LF in every CR.
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