Specifications

Ammonia Gas Monitor – Multi Zone
Instruction 3015-5113 17
Connecting Communication Devices
Remote Display Module (AGM-RD) Connection
The AGM-MZ is connected to the AGM-RD using a shielded twisted pair instrument cable. The maximum
distance between the farthest away AGM-MZ and AGM-RD is 4500 feet.
Use any of the remaining service knockouts to gain access to the interior of the monitor. The RS-485
communication wiring between the AGM-MZ and AGM-RD must be connected in the following manner:
Locate the RS-485 connector in the AGM-MZ (page 15). Connect one lead of a twisted shielded pair to
the “B” connection point (the far right point), note the wire color. Connect the second wire to the “A”
connection point (the middle), note the wire color. Connect the ground to the “
” connection point
Locate the RS-485 connector marked “TO MONITORS” in the AGM-RD (See this topic in the AGM-RD
manual 3015-5162). This connector is located on the bottom of the AGM-RD PC board, second from the
right. Make the wire run to the AGM-RD and connect the twisted shielded pair to the RS-485 “TO
MONITORS” connector using the same color code as used on the AGM-MZ.
Integrating with Building Management Systems
The AGM-MZ may be connected directly to a Building Management System using a shielded twisted pair
cable. The cable from the Building Management System is connected to the RS-485 connector inside the
AGM-MZ. MODBUS RTU is the standard communication protocol.
Use any of the remaining service knockouts to gain access to the interior of the monitor. Locate the RS-485
connector and remove it from the circuit board. Secure the wire leads to the connector orienting them as
shown in the diagram below. Check to make sure that the polarity matches the wiring to the Building
Management System. When you are through securing the connections, carefully plug the connector back
onto the circuit board.
Larger Integrated Systems
You may also connect the AGM-MZ to a Building Management System through an AGM-RD. In this case,
first connect the AGM-MZ to the AGM-RD as described above. Then, follow the instructions in the
Communications Connections section of the AGM-RD manual (3015-5162) for information on how to connect
the AGM-RD to a Building Management System.
RS-485 Connector
RS-485
GROUND
LEAD A
LEAD B