How to troubleshoot D636A Device Comm Error D6112

Overview

Device Comm Error displays on the keypad. Reports trouble zone 2.

Wiring issue with the devices.

Issue

Device Comm Error displays on the D636 keypad. CS is receiving a Trouble zone 2 signal.

Solution

The devices (D636, D620, D640) have a wiring issue.

All device data wiring should be connected in series.

Example: Data wire out from panel terminal 11 to the first device