Daisy Chaining Comm/Net Products

Alarm daisy chaining is a commonly used process for connecting a series of product alarms from the same locations. With Comm/net products this is often seen in BDFB’s or with Comm/net Systems panels in the same rack row.

Daisy Chaining with a terminal block

Terminal Block Alarm Daisy Chain

Above is a diagram showing a NC daisy chain for a series of terminal bloc alarms.

The COM connection of the first panel is wired to the alarm monitoring system. Then in the middle panel the NC is connected to the COM of the next panel in the row. Then that pattern is repeated as many times as necessary down the row or up the BDFB. Then the NC connection from the last panel is connected to the alarm monitoring system.

The same technique can be used for NO, just wire to that pin of the terminal block instead of NC. 

Daisy Chaining with RJ45 connections

* Use IEC T568B terminations for all RJ45 Alarm monitoring on Comm/Net products.


WARNING: When using RJ45 daisy chaining the NO condition must be monitored, you cannot monitor NC.

When daisy chaining panels with RJ45 connections the two RJ45 jacks on Comm/net products are commend together. So simply run a cable connecting one panel to the next panel and so on down the row. Then on the last panel connect the jack to alarm monitoring system. Refer to the manual for the product you are wiring for the pin out of the connector.

BDFB’s come with the daisy chain wiring already in place from the factory. So all you need to do is connect the last jack in the chain to the alarm monitoring system. 

IEC T568B Pin out

If you are having trouble with this guide, please contact Comm/net Systems Support.

Comm/net Systems Inc. Support


(206) 282-8670

or submit a support ticket through this portal.