4.1.2 TWISTED PAIR CONNECTION USING RJ-11 OR RJ-45
The RJ-11 and RJ-45 connectors on the Model 1004A’s twisted pair
interface are pre-wired for a standard TELCO wiring environment. The
signal/pin relationships are shown below:
RJ-11
SIGNAL
RJ-45
SIGNAL
1 ...................GND
†
1 ...................N/C
2 ...................RCV-
2 ...................GND
3 ...................XMT+
3 ...................RCV-
4 ...................XMT-
4 ...................XMT+
5 ...................RCV+
5 ...................XMT-
6 ...................GND
6 ...................RCV+
7 ...................GND
8 ...................N/C
†
Connection to ground is optional
When connecting two Model 1004A’s, 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-Wire)
SIGNAL
PIN#
PIN#
SIGNAL
XMT+
4-----------------------4
XMT+
XMT-
5-----------------------5
XMT-
†
Connection to ground is optional
4.2 WIRING FOR MULTIPOINT CIRCUITS
The Model 1004A 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. Note:
Refer to Section 3.2.2 for multipoint DIP switch settings.
4.2.1 STAR TOPOLOGY
Using a star topology, you may connect several Model 1004As
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.
13
14
1
2
3
4
5
6
7
8
1
2
3
4
5
6
