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Master Alarm Service Manual
3.7 Master Alarm OUTPUTS
If using dry contacts to connect the APs to a BMS, use the same wiring method/logic as with the INPUTS. It is important
that the wiring for each alarm point OUTPUT correlates to the wiring for the alarm point INPUT. See Figure 3.7 below.
Example: MA 1 INPUT connection corresponds to INPUT P1 on the display. MA 1 OUTPUT connection to the BMS would be wired to the MA 1
Output Terminals.
Corresponds to
INPUT P1
3.7.1
Alarm Outputs via Modbus
For installations that require Alarm Communications via Modbus, the process below should be used in order to
communicate AP information between the Master Alarm and the BMS.
Using communication cable/connector type RJ-11 plug into Serial Port #2 on the HMI/PLC (See Figure 3.7.1). Plug
the other end of the cable into the device that will be monitoring the APs. Reference page 14 for Modbus Net ID screen
configuration.
PORT 2 Master Alarm HMI/PLC Modbus Connection
Use Port 2 for Remote AP Communications. Port 2 is clearly
marked on the unit – please be sure to connect properly.
[FIGURE 3.7]
[FIGURE 3.7.1]
MA INPUT #1 (+/–)
terminal connection points
MA OUTPUT #1 (+/–)
terminal connection points
