Access Control/How To Wire a RS485 Reader

How to wire Card Reader via RS-485 protocol


This article is to show how to wire Dahua Card Reader to Dahua Access Controller using RS-485 Protocol.

An RS485 bus is capable of covering up to 1000m end to end, using twisted-pair cables. An RS485 bus can offer good immunity to electrical noise, making it ideal for interconnecting components around buildings.


  • ASC1204C/ASC1204B
  • Dahua Card Reader

Wiring Diagram