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Originally Posted by Kyveck
I ran the serial port diagnostic tests. In loopback mode, terminal input was not echoed.
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This indicates that your TTL-RS232 converter board, cable, or the TTL serial port port itself is messed-up. To discount the TTL serial port as the source of your problem, remove the converter board from the TTL serial port and short the RX and TX pins with a piece of wire, jumper block etc. See the attached file to identify the RX and TX pins. Once you've done that, reload the serial port diagnostics and perform test one, the loopback test. If you get characters echoed back to the terminal, your problem is either the converter board or your cable. Remove the jumper and plug the converter board back in and short the two upper pins that connect to the red and white wires. Perform the loopback test again. Do you get the characters echoed? If not, your converter board is toast. If you do get echo, your PWM cable is bad.
-Kevin