I’m trying to set up a simple communication system between an arduino uno and a camera to control its PTZ. This type of camera uses RS-485 with the protocol PELCO D.
My question would be if is possible to wire 2 DO directly to camera and generate the data knowing that:
A - B < -0,3V = MARK = OFF = 1
A - B > +0,3V = SPACE = ON = 0
And within the arduino sketch controlling the bit rate and checksum if necessary.
The main purpose of this question is avoiding new hardware like an rs485 shield or similar.