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When connecting two Model 1008s, it is necessary to use a
crossover cable. The diagrams below show how a crossover cable
should be constructed for the following environments: 4-wire RJ-11,
4-wire RJ-45, 2-wire RJ-11 or 2-wire RJ-45.
RJ-11 Cable (4-Wire)
SIGNAL PIN# PIN# SIGNAL
GND
†
1-----------------------6 GND
†
RCV- 2-----------------------4 XMT-
XMT+ 3-----------------------5 RCV+
XMT- 4-----------------------2 RCV-
RCV+ 5-----------------------3 XMT+
GND
†
6-----------------------1 GND
†
†
Connection to ground is optional
RJ-45 Cable (4-Wire)
SIGNAL PIN# PIN# SIGNAL
GND
†
2-----------------------7 GND
†
RCV- 3-----------------------5 XMT-
XMT+ 4-----------------------6 RCV+
XMT- 5-----------------------3 RCV-
RCV+ 6-----------------------4 XMT+
GND
†
7-----------------------2 GND
†
RJ-11 Cable (2-Wire)
SIGNAL PIN# PIN# SIGNAL
XMT+ 3-----------------------3 XMT+
XMT- 4-----------------------4 XMT-
RJ-45 Cable (2-W
ire)
SIGNAL PIN# PIN# SIGNAL
XMT+ 4-----------------------4 XMT+
XMT- 5-----------------------5 XMT-
†
Connection to ground is optional
13
4.2 WIRING FOR MULTIPOINT CIRCUITS
The Model 1008 supports multi-point applications using either a
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 1008s
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 1008 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
1008s 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.
(Continued)
14
HOST FIRST SLAVE SECOND SLAVE
XMT+ RCV+
RCV+
XMT- RCV-
RCV-
RCV+ XMT+
XMT+
RCV- XMT-
XMT-
Figure 5. Star wiring for Model 1008 host and slaves