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4.2 WIRING FOR MULTIPOINT CIRCUITS
The Model 2089 supports multi-point applications using either a
HOST
XMT+---------------------RCV+-----------------------RCV+
XMT- ---------------------RCV- -----------------------RCV-
RCV+---------------------XMT+-----------------------XMT+
RCV- ---------------------XMT- -----------------------XMT-
Figure 6. Daisy chain wiring for Model 2089 host and slaves
star or daisy chain topology. Both topologies require special wiring, as
well as specific DIP switch settings for master and slave units. Refer to
Section 5.0 for multipoint DIP switch settings.
4.2.1 STAR TOPOLOGY
Using a star topology, you may connect several Model 2089s
together in a master/slave arrangement. Maximum distance between
the units will vary based upon the number of drops, data rate, wire
gauge, etc. Call Technical Support for specific distance estimates.
Figure 5 (below) shows how to wire the two-pair cables properly for
a Model 2089 star topology. Note that the ground connection is not
needed.
4.2.2 DAISY CHAIN TOPOLOGY
Using a daisy chain topology, you may connect several Model
2089s together in a master/slave arrangement. Maximum distance
between the units will vary based upon the number of drops, data rate,
wire gauge, etc. Call Technical Support for specific distance estimates.
Figure 6 (below) shows how to wire the two-pair cables properly for
a Model 2089 daisy chain topology. Note that the ground connection is
not needed.
4.3 CONNECTION TO THE EIA/TIA-574 INTERFACE
The Model 2089 is designed to plug directly into the DB-9 serial
port of an EIA/TIA-574 DTE device (PC, laptop, host). If you must use
a cable to connect the Model 2089 to the DTE device, make sure that it
FIRST SLAVE
(Continued)
15
OTHER SLAVE(S)
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