I have an Arduino Nano which talks happily to my various devices. I have a Synscan v3 Telescope handset that I’d like to interface to, but I am unsure of the exact protocol or voltages.
The purchased PC connections seem to offer USB->MAX232->6p6c connection via a variety of cables and adaptors. It sounds simple but all the PC cables on offer seem to be USB(MAX232)->DB9(m)->DB9(f)->6p6c.
It seems that if I use SoftwareSerial I should be able to take the RxTx pins out of the Arduino (say pins 10 & 11) and run them straight over a 6 core cable to the 6p6c socket on the handset. However…
The various sites I read seem to say that RS232C is +5v->-5v, so I’m not sure where the -5 volts comes from in SoftwareSerial. Would I be better using the RS232 shield, or is there no difference? It would be a bit of a squeeze to get a shield in, but I think there is just space.
Thanks for your time on this.