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4.2 WIRING FOR MULTIPOINT CIRCUITS
The Model 1070 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.
4.2.1 DAISY CHAIN TOPOLOGY
Using a daisy chain topology, you may connect several Model
1070s 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 Patton Technical Support for specific distance
estimates.
Figure 4 (below) shows how to wire the two-pair cables properly for
a Model 1070 daisy chain topology. Note that the ground connection is
not needed.
In a multipoint topology, you must configure the CARRIER
ENABLE switch (DIP switch 8) differently for the master Model 1070
than for the slave Model 1070(s). Here are the proper DIP switch
settings for a daisy chain topology:
Switch
Number 8
Master Positions OFF
Slave Positions ON
4.2.2 STAR TOPOLOGY
In a star topology, you may connect several Model 1070s 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 Patton Technical Support for specific distance estimates.
Figure 5 (below) shows how to wire the two-pair cables properly for
a Model 1070 star topology. Note that the ground connection is not
needed.
In a multipoint topology, you must configure the CARRIER
ENABLE switch (DIP switch 8) differently for the master Model 1070
than for the slave Model 1070(s). Here are the proper DIP switch
settings for a star topology:
Switch
Number 8
Master Positions OFF
Slave Positions ON
4.2 RS-232 CONNECTION
To connect the Model 1070 to data terminal hardware (PC, host,
terminal, etc.), use a
straight through
RS-232 cable. To connect the
Model 1070 to data communications hardware (modem, multiplexer,
etc.), use a
null modem
RS-232 cable.
HOST FIRST SLAVE SECOND SLAVE
XMT RCV
RCV
XMT RCV
RCV
RCV XMT
XMT
RCV XMT
XMT
Figure 5. Model 1070 star wiring
9 10
HOST FIRST SLAVE OTHER SLAVE(S)
XMT RCV RCV
XMT RCV RCV
RCV XMT XMT
RCV XMT XMT
Figure 4. Model 1070 daisy chain wiring