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MGS-402 User Manual
Refer to the MGS-410 User Manual (P/N: 1100-2294) or Quick Start Guide (P/N: 1100-2290) for location and
connection of the corresponding Modbus terminal block in the MGS-410 gas sensor.
NOTE: Ensure that the corresponding wire colors noted above are connected to the correct 'B' and
'A' terminals in the Modbus terminal block in the MGS-410 gas sensor and the ground and drain
are properly terminated according to Modbus protocol.
3.6.2 Integration with Building Management System
A second Modbus connection is available in the MGS-402 to connect to a Building Management System
(BMS). The physical connections are made the same as described above in section 3.6.1 but using the
Modbus/BMS terminal block (item 3 in "Figure 2-3 - MGS-402 Layout" on page 7).
1. Locate the Modbus / BMS terminal block in the MGS-402.
2. Feed Belden 3106A or equivalent cable through one of the M16 cable glands (item 13 in "Figure
2-3 - MGS-402 Layout" on page 7) and connect to the appropriate terminals noting the color
of the wire.
3. Make similar connections to the BMS noting wire color.
4. Controller/BMS Modbus configuration will need to be completed in section 4.2, Controller Setup.
3.7 Connecting External Alarms
3.7.1 Overview
In addition to the integrated visual and audible alarms there are several outputs available in the MGS-402 to
interface with external ventilation, external equipment or for connection to a BMS or buildings fire safety panel.
There are (3) form C relay contacts rated 10A at 240VAC and (2) Analog Outputs (4-20ma, 1-5V, 2-10V). In
addition there is (1) Remote Silence input to interface with a momentary push button that may be in a
different location than the MGS-402. See items 1 (Analog outputs), 7-9 (Form C Relays) and 4 (Remote Silence) in
"Figure 2-3 - MGS-402 Layout" on page 7.
The additional outputs should be wired in the same manner as the power and Modbus connections. Use
appropriate conductor sizes on the form C relays that adhere to local building codes. The remote silence
and analog outputs can be wired using Belden 3106A or equivalent cable.
NOTE: The relay contacts are rated 10A at 250VAC resistive load.
1100-2570 Rev 1
11
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