[Technical Notice] RS-485 Readers Failed to Connect to GV-AS Controller

Access Control technical notice
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joycechang
Posts: 7
Joined: June 1st, 2022, 1:16 pm

[Technical Notice] RS-485 Readers Failed to Connect to GV-AS Controller

Post by joycechang »


Article ID: GV4-22-08-17
Release Date: Aug 17, 2022


Applied to
RS-485 readers

Symptom
RS-485 readers failed to connect to GV-AS Controller. When a reader successfully connects to GV-AS Controller via RS-485, the Controller's Web interface should show a green tick under Connection Status, and the reader's LED should switch off from a continuous red.

RS485.png
RS485.png (179.56 KiB) Viewed 139 times

Solution
If the reader's LED remains red and there is no successful connection status on the Web interface as mentioned above, try adding a 180 Ohms terminal resistor on the RS-485 terminal block of the reader to extend the range of data communication.

terminal resistor.png
terminal resistor.png (3.25 KiB) Viewed 139 times
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