This card can be addressed via the dipswitch and the RS422 Full Dublex communicates with the Windows desktop program and provides information from the switch on the screen to monitor the relay status from the screen and to control it remotely. 1024 cards can be controlled. Since I started working with PcbWay, I would like to thank you very much for adding a new color to my 3rd order and prototype works. They're really good at helping. The pcb quality is excellent, the process of monitoring the phase of the process is reassuring, relieving, and making great efforts to assist in all kinds of issues. You can order without hesitation. Thank you very much PcbWay, well you are there...