Multipoint Twisted Pair Connection - Patton electronics 2085RC User Manual

When connecting two Model 2085RCs, it is necessary to use a
crossover cable. The diagrams below show how a twisted pair 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#
GND † 1-----------------------6
RCV- 2-----------------------4
XMT+ 3-----------------------5
XMT- 4-----------------------2
RCV+ 5-----------------------3
GND † 6-----------------------1
† Connection to ground is optional
RJ-45 Cable (4-Wire)
SIGNAL PIN#
GND † 2-----------------------7
RCV- 3-----------------------5
XMT+ 4-----------------------6
XMT- 5-----------------------3
RCV+ 6-----------------------4
GND † 7-----------------------2
RJ-11 Cable (2-Wire)
SIGNAL PIN#
XMT+ 3-----------------------3
XMT- 4-----------------------4
RJ-45 Cable (2-Wire)
SIGNAL PIN#
XMT+ 4-----------------------4
XMT- 5-----------------------5
† Connection to ground is optional
PIN# SIGNAL
GND †
XMT-
RCV+
RCV-
XMT+
GND †
PIN# SIGNAL
GND †
XMT-
RCV+
RCV-
XMT+
GND †
PIN# SIGNAL
XMT+
XMT-
PIN# SIGNAL
XMT+
XMT-
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4.4.2 MULTIPOINT TWISTED PAIR CONNECTION

The Model 2085RC supports multipoint applications using a star
daisy chain topology (Section 3.0 describes proper multipoint configu-
ration). Maximum distance between the units will vary based upon the
number of drops, data rate, wire gauge, etc. Call Patton Technical
Support for specific distance estimates. The diagram below shows how
to wire the two-pair cables properly for a Model 2085RC star topology.
Note that the ground connection is not needed.
HOST FIRST SLAVE
XMT+ RCV+
XMT- RCV-
RCV+ XMT+
RCV- XMT-
SECOND SLAVE
RCV+
RCV-
XMT+
XMT-
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