ZyXEL Communications MES3500-24 User Manual

Chapter 3 Hardware Overview

MES3500-24/24F User’s Guide

Use a connector to connect wires of the correct gauge to the sensor’s signal output pins. See 

 for the wire specifications. Check the sensor’s documentation to identify its 

two signal output pins.

Connect these two wires to any one of the following pairs of signal input pins on the Switch’s Signal 
connector--(4,5) (6,7) (8,9) (10,11). The pin numbers run from the right side of the connector to 
the left.

Connect each of the sensor’s two signal output wires to the Signal connector by depressing 

the spring clip corresponding to the pin you are connecting to.

Insert the wire and release the spring clip.

Repeat the process for the sensor’s other signal output wire. A total of four sensors may be 

connected to the Signal connector in this way using the remaining signal input pins.

Insert the alarm connector into the Signal slot.

Connecting a Sensor to the Signal Slot 

To connect an output devicel, repeat the previous steps but this time connect to either pins (1,2) or 
(2,3) on the Signal connector.

You can also daisy-chain the external alarm to another ZyXEL Switch which supports the external 
alarm feature. If daisy-chaining to a ZyXEL switch that is a different model, check your switch’s 
documentation for the correct pin assignments.

Use wires of the correct gauge to connect either of the signal output pin pairs (1-normal close, 2-
common) or (2-common, 3-normal open) on the Signal connector to the input signal pin pairs of 
an Signal connector on another ZyXEL Switch.

(Dry contact, 

normal open only)