I'm trying to use the uart on an MSP-FET to connect to a custom-made board. But I stumble on the first hurdle - getting some traffic through the uart.
I'm bridging pins 12 and 14 (TX and RX) and all other pins are disconnected. I was expecting to be able to loop some data, but I don't get anything.

I'm running Ubuntu Linux 20.4 and I get two tty's - ttyACM0 and ttyACM1. But none of them responds when I connect using minicom.

I have tested with an FTDI serial adapter, and that one works fine. (ttyUSB0)

(MSP-FET = MSP MCU Programmer and Debugger by Texas Instruments, used for developing devices based on MSP430 microcontrollers. It utilises a 14 pin connector with jtag, Spy-Bi-Wire and uart interfaces. )

  • \$\begingroup\$ Had to look up what a "MSP-FET" is, so added a link to your question :) \$\endgroup\$ Sep 13, 2020 at 9:27
  • \$\begingroup\$ Which MSP-FET? And which connector? \$\endgroup\$
    – CL.
    Sep 13, 2020 at 11:07
  • \$\begingroup\$ @CL Sorry, I didn't know that there were more than one product called MSP-FET. See the link that Marcus Müller so kindly added. I'm also adding a short description in case the link breaks in future. \$\endgroup\$
    – Robert
    Sep 13, 2020 at 14:22
  • \$\begingroup\$ Are you trying to use 9600 baud? What happens if you switch to a higher rate? \$\endgroup\$
    – CL.
    Sep 13, 2020 at 14:51
  • \$\begingroup\$ @CL It started working at 38400. Thank you. Why wouldn't it work on lower baud rates? Or rather, what made you come up with the suggestion to increase the rate? \$\endgroup\$
    – Robert
    Sep 13, 2020 at 16:05

1 Answer 1


I had the same issue. The problem is that you have to "activate" the COM port. One way to do it is starting a debug session in CCS. Other option is using the MSPFlasher and executing the order MSPFlasher -z [VCC].


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