Citation de: jross001 le Jeudi 07 Décembre 2023, 02:20:06 AMThank you. I'm guessing the board is fine. Both serial2 (TX/RX) and serial3 (Tx+/- rx+/-) report "test" when the loopback is in place.
Citation de: jross001 le Jeudi 07 Décembre 2023, 02:20:06 AM2. what is that little breakout board on the PCB? RS232 to TTL?
It's TTL to RS232 converter
Citation de: jross001 le Jeudi 07 Décembre 2023, 02:20:06 AM3. Can I just do RX+TX+GND headers directly into RS232-RS422 converter or do I need the TTL?
No, you need RS232 for the RS232/RS422 converter.