Bacharach HGM300, Руководство по установке и эксплуатации

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10
Instruction 3015-4149
SECTION 5
Multiple HGM’S
MULTIPLE HGM300’S WITH RDM800
NOTE 1: The last HGM300 or RDM800 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 HGM300’s
NOTE: The terminators in the RDM800 and HGM300 Unit 4 must be in the “IN”
position. The terminators in HGM300 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 HGM300 may be connected to a Building Management System via the RS-485 connector. The node
address switch on each HGM300 can 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 RDM800 as address “1” therefore you should not have a unit set to “0” and another
set to “1” on the same network.
If the HGM300 network is connected directly to a Building Management System it may not be connected
to the RDM800. However, the RDM800 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 RDM800 port while the downstream RDM800 port talks to the HGM300’s. In this case, the BMS is
talking “through” the RDM800 to the HGM300’s, but not physically on the HGM300/RDM800 network.
NOTE: If the HGM300 is not at the end of the line in a series connection, then the terminator on the HGM
must be set to “OUT.” Also, each end of the series must have the terminator set to “IN”.
TERMINATOR
“OUT”
TERMINATOR
TERMINATOR TERMINATOR TERMINATOR
“IN” “OUT” “OUT” “IN”
HGM300
NODE 1 HGM300
NODE 2 HGM300
NODE 3 HGM300
NODE 4
BMS
TERMINATOR
“IN”
RMD800
HGM300
UNIT 2
NODE 2 HGM300
UNIT 3
NODE 3 HGM300
UNIT 4
NODE 4 HGM300
UNIT 1
NODE 1
RS-485