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A
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M-3520 Instruction Book
4–4
Multiple Systems Setup
The individual addressing capability of IPScom
®
and the relay allows multiple systems to share a
direct or modem connection when connected using
a communications-line splitter (see Figure 4-2). One
such device enables 2 to 6 units to share one
communications line.
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CAUTION
:
Units connected to a communications
line splitter must have a unique communications
address. If two or more units share the same address,
corrupted communications will result.
Serial Multidrop Network Setup
Individual remote addressing also allows for
communications through a serial multidrop network.
Up to 32 relays can be connected using the same
2-wire or optional 4-wire RS-485 communications
line.
Appendix B, Figure B-2 illustrates a setup of RS-232
Fiber Optic network, and Figure B-3 illustrates a
2-wire and 4-wire RS-485 network.
Other communication methods are possible using
the M-3520 Intertie Protection Relay. An Application
Note, “
Serial Communication with Beckwith Electric’s
Integrated Protection System Relays” is available
from the factory, or from our website at
www.beckwithelectric.com.
Communications-Line Splitter
Up to six controls
can be used with a
communications-line splitter.
Address 2
Address 4
Address 5
Address 6
Address 3
Address 1
IBM-Compatible PC
Integrated Protection
System
Null Modem Cable for
Direct RS-232 Connection
Master Port
Figure 4-2
Multiple Systems Addressing Using Communications-Line Splitter
M-3520
Summary of Contents for M-3520
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