I am trying to get RS232 connection from the PC to Arduino UNO rx/tx pins 1,2 with an intervening cable. This is to allow the PC to be operated remotely from the Arduino, ideally via a 10 metre screened cable.
I have a TTL/RS232 level converter at the Ardino end, having a female DB9 connector. At the PC I am using a USB serial adapter with a corresponding male DB9 connector. This works perfectly and uploads sketches on the bench. It has tell-tale LEDs indicating activity.
My assumption was that I would only require a 'straight' as opposed to cross-over cable with ground (pin 5), Rx (pin 3 at the PC end) and Tx (pin2 at the PC) - pins 3 and 2 respectively and TX and Rx at the Arduino end.
However this does not appear to be working at all, and I am seeing no signal at the PC end (via scope or LEDs), so I am now wondering if I need some strapping to persuade each end that there is a connection operating?
Does anyone know what strapping might be required (and if it is), and practically what baud rate can be achieved over 10 metres? How do I reduce the upload baud rate to keep it working? 115200 baud may be too ambitious.