I am currently working on a project using two arduinos to essentially extend an RS422 device over TCP/IP. The device uses the 4-wire TX+, TX-, RX+, RX- wiring but I can only find RS485 shields on the market, I have two of these shields for testing purposes at the moment and trying to work out if it will accept an RS422 input. I know the protocols are similar but also different in the way signal flows (full-duplex vs half-duplex) however the shield I am using seems to accept 4-wire.
The device requires bi-directional communication from either end so it probably further complicates what I’m trying to do using a 422 device with 485 shields.
The problem I’m facing is there is little to no documentation on these RS485 shields so I really have no idea if what I want to do is possible.
The RS485 Shield: http://linksprite.com/wiki/index.php5?title=RS485_Shield_V2.1_for_Arduino
Shield Schematic: https://s3.amazonaws.com/linksprite/Shields/RS485/RS485shield-v2.pdf
If this is not possible does anyone know any RS422 Shields that they can recommend? I am actually struggling to find one searching online.
Any help would be much appreciated. Thanks!!