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AT-MGS-402 User Manual
4. Operation
4.1 Overview
4.1.1 Main Function
Every second the AT-MGS-402 Gas Detection Controller collects gas concentration and status information
from each connected gas detector. Connection status, fault and alarm conditions are indicated by the LED
matrix for each channel. Detector data and controller status information can also be communicated via
Modbus, to a master or BMS device.
4.1.2 Power Up
During power up the perimeter visual alarm and the audible alarm will both run through a test cycle.
The green Power LED for the controller
(See item 2, “Figure 2 - Front Panel Layout” on page 7)
will illuminate.
When the AT-MGS-402 establishes communications with the AT- MGS-410 controllers the Fault LED for the
controller
(item 2, “Figure 2 - Front Panel Layout” on page 7)
will go from amber to not illuminated. It can take
up to 5 minutes for the AT-MGS-410 Gas Detectors to warm up.
4.1.3 Channel Number Keys
Pressing a channel number key for five-seconds on the front panel of the AT-MGS-402 will silence an audible
alarm for 30-minutes. After which time, AT-MGS-402 will re-alarm or reset depending on whether the alarm
condition still remains.
4.2 Controller Setup
4.2.1 Modbus Setup
Configure AT-MGS-402 to BMS. If using the AT-MGS-402 to interface with a BMS as a slave the Modbus
protocol needs to be configured.
(Refer to “Figure 2-3 - AT-MGS-402 Layout” on page 6.)
