Bacharach AGM300 - Manual (Page 20)

12 Instruction 3015-4275
Multiple AGM’s
MULTIPLE AGM300’S WITH ADM800
NOTE 1: The last AGM300 or ADM800 on either end of the network must have its terminator
in the “IN” position, and all other units must have their terminators in the “OUT” position.
NOTE 2: The total length of the RS-485 cable cannot exceed 4500 feet. (Use instrument
cable 20 gage multi-strand shielded and twisted pair – similar or equal to Belden
cable #8762.)
RS-485 CONNECTIONS BETWEEN AGM300’s
NOTE: The terminators in the ADM800 and AGM300 Unit 4 must be in the “IN” position. The
terminators in AGM300 Units 1, 2 & 3 must be in the “OUT” position.
TERMINATOR
TERMINATOR TERMINATOR TERMINATOR
“OUT” “OUT” “OUT” “IN”
Connecting to a Building Management System
The AGM300 may be connected to a Building Management System via the RS-485 connector. The node
address switch on each AGM300 may be set from “1” to “15” in order to identify itself to the Building
Management System. Note that Building Management Systems set to a “0” or “1” address both respond to
messages from the ADM800 as address “1” therefore you should not have a unit set to “0” and another set to
“1” on the same network.
If the AGM300 network is connected directly to a Building Management System it may not be connected to the
ADM800. However, the ADM800 has two communication ports, an “upstream” port (labeled TO HOST) and a
“downstream port (labeled TO MONITORS). A BMS node may be connected to the up stream ADM800 port
while the downstream ADM800 port talks to the AGM300’s. In this case, the BMS is talking “through” the
ADM800 to the AGM300’s, but not physically on the AGM300/ADM800 network.
NOTE: If the AGM300 is not at the end of the line in a series connection, then the terminator on the AGM must
be set to “OUT.” Also, each end of the series must have the terminator set to “IN”.
MULTIPLE AGM300'S CONNECTED TO A BUILDING MANAGEMENT SYSTEM
TERMINATOR
“OUT”
TERMINATOR
TERMINATOR TERMINATOR TERMINATOR
“IN” “OUT” “OUT” “IN”
AGM300
NODE 1 AGM300
NODE 2 AGM300
NODE 3 AGM300
NODE 4
BMS
AMD800
AGM300
UNIT 2
NODE 2 AGM300
UNIT 3
NODE 3 AGM300
UNIT 4
NODE 4
TERMINATOR
“IN”
AGM300
UNIT 1
NODE 1
RS-485