Bacharach AGM300 - Manual (Page 34)

26 Instruction 3015-4275
ADM800 - Communication Connections
AGM300 Network
The ADM800 Ammonia Display Module is connected to the AGM300 network using a shielded twisted pair
cable. The maximum distance between the ADM800 and the farthest AGM300 is 4500 feet.
Use any of the remaining service knockouts to gain access to the interior of the ADM800. The RS-485
communication wiring between the ADM800 and AGM300 must be connected in the following manner:
Locate the RS-485 connector marked “TO MONITORS” in the ADM800 (Page 23). This connector is
located on the far-left bottom of the ADM800 circuit board. Connect one lead of a twisted shielded pair to
the “B” connection point (the far left 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 “GND” connection point.
Make the wire run to the AGM300 and connect the twisted shielded pair to the AGM300 RS-485 connector
(Page 7) using the same color code as used on the ADM800.
Integration with Building Management System
A second RS-485 connector inside the ADM800 allows a Building Management System to “talk” to the AGM300
network through the ADM800. The connection is established using a shielded twisted pair cable.
Use any of the remaining service knockouts to gain access to the interior of the ADM800. Locate the RS-485
connector marked “TO HOST” (Page 23) 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.
RS-485 Connector