@Shaurabh OK they actually have a pretty nice document for that! Now what is your CNC machine? What serial port document do you have for it?
The serial cape has only TXD and RXD driven, no handshake or flow control. The CNC might expect something specific. It does look like the serial cape has some of the control signals fed back, I did not study it enough and map the 5x2 ribbon cable to the DB9 to figure that out. You would need a null modem cable between the BBB DTE serial port and the CNC DTE serial port, or you can modify the BBB serial as DCE instead. If you make the BBB as DCE, and connect a straight serial cable to your PC DTE, you should see the BBB bootloader information every time BBB powers up. And you can log in to BBB on that serial0 port too. If things are eventually connected correctly to the CNC, it will also see the BBB bootloader information: is that OK for the CNC or will it get confused? If the CNC sends some data to the BBB during bootup it could confuse BBB. So it might be better to use serial4, set as DCE which has no BBB debug use already. If you do that, you could connect serial4 as DCE from BBB to your PC with a straight cable, and pretend your PC is the CNC. See if you can open a terminal on the PC and BBB and see data both ways. If so then it should work on the CNC just by moving the cable over. This assumes the CNC doesn't need some specific flow control or handshake. You might be able to disable that from the CNC side so all it needs is TX and RX. Aren't serial ports wonderfully confusing? At this moment I have a headache from working on code and hardware (not on BBB, we are using a Teensy ARM Cortex M4 this time) talking to a custom RS422-sort-of serial connection so I feel your pain. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAC32br%2BK65pihWC4ZwDfCB8xgwNxe1pAZ2oj_RWME%3DL3KVPX%3DQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
