I need to interface with a motor controller through RS232. I am using an arduino for this. The datasheet has a page on RS232 interfacing shown below, could someone please identify what I would need to communicate with this from an arduino?
there are no details on the RS232 voltages, as far as I know following the standard I should be able to communicate with lines from 0 to +3.3v since this lies within the spec of 0v to +3 - +12v however so far I am unable to get a response from the device by connecting Tx, Rx, and GND to a ttl logic USB serial device, nor my arduino.
Using the RS232 cable supplied with the controller I am able to communicate both with the supplied software and through a serial COM port sniffer, so I am sure my data addressing is correct.
I feel like there is a perhaps a voltage level difference issue, or maybe i need to control the other pins however I was under the impression these were optional, could someone please shed some light?