If you used a straight through serial cable from your PC to the CNC then the CNC is likely DCE, since the PC serial is usually DTE. If you used a null modem cable then the CNC could be DTE. You didn't specify which cable you used.
DCE is Data Communication Equipment and originally was a device like a modem, not a Terminal or PC. DTE, the Data Terminal Equipment was "in charge" and could control peripherals like serial modems or printers. A modem or DCE device generally just waits there to be told what to do. DTE connects to DCE with a "standard" cable which is just straight through since the hardware DCE and DTE ports themselves are wired such that the TXD from DTE connects to the RXD of DCE and vice versa. To connect DTE to DTE or DCE to DCE you need a "null modem" cable which swaps those pins in the cable, otherwise you have both TXD connected to each other = won't work. What UART adapter are you using on BBB? Did I miss that information? Apologies if I just added to the confusion. Bruce -- 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/41fdcae3-e966-415c-bb07-156662743ee5%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
