Figure 18 Connecting A Sensor To The Alarm Slot; Figure 19 Daisy-Chaining An External Alarm Sensor To Other Switches Of The Same Model - ZyXEL Communications MES-3728 User Manual

2c Repeat the process for the sensor's other power output wire. A total of four sensors
may be connected to the ALARM connector in this way using the remaining power
input pins.
3 Insert the alarm connector into the ALARM slot.

Figure 18 Connecting a Sensor to the ALARM Slot

Smoke
Detector
ALARM
Connector
4 To connect an output device such as an alarm bell, repeat the previous steps but this time
connect to either pins (1,2) or (2,3) on the ALARM 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.
1 Use wires of the correct gauge to connect either of the power output pin pairs (1-normal
close, 2-common) or (2-common, 3-normal open) on the ALARM connector to the input
power pin pairs of an ALARM connector on another ZyXEL Switch.
2 When daisy-chaining further Switches ensure that the output power pins you use are the
same as those you used when connecting to the first switch, as shown in the diagram
below.

Figure 19 Daisy-chaining an External Alarm Sensor to Other Switches of the Same Model

MES-3728 User's Guide
11 10 10 9 8 7 6
Alarm Input Pins
11 10
11 10
11 10
Pin Assignments
Chapter 3 Hardware Overview
Spring
Clip
5 4 3 2 1
Alarm Output Pins
.........
3 2 1
.........
3 2 1
.........
3 2 1
49