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Installation Guide
PBX Interface T942PX
5. Addressing
Select the proper address by setting address selector
switch SW01 (see the document System Installation,
under "Addressing"). The address must not be 00
nor the same as any other 900 unit address.
6. Selection of A or B Bus
A bus is normally used. To use B bus: remove the
0-ohm resistors R87, R88 from the PC board and
solder together jumper points S04 and S05.
(See drawing above.)
7. Wiring Runs
The plastic partition (shaded in the drawing) is scored
to facilitate breaking at convenient intervals.
1996 11 06
1
8
SW01
R87
S04
R88
S05
1
1
1
2
3
4
5
6
2
1. Use pliers to break off a suitable section.
2. Run the wiring out through the partition.
Wiring can be run three ways from the unit:
• Remove the rectangular pieces and run the
cabling out through the side (1).
ON
1
OFF
• Break off sections at short side of case and run
the cabling downwards (2).
• Run the cabling through the round holes at the
bottom of the case (3)
Secure the wiring with cable straps.
8. Connecting Supply Voltage and Buses
1. Supply voltage is connected to screw 1 and 2 of
screw connector J03. (See the document "System
Installation", under "Supply Voltage").
2. Connect modular bus cabling to J01 and J02
(1 in drawing at below left),
and/or
A or B bus to J03 screw 5 and 6
(dwg below and 2 in drawing at left).
NOTE: The data lines are polarized. Use only
Supply voltage in
Supply voltage out
3
3
2
2
twisted-pairs for two-wire connections!
A or B bus
TD 91012GB
1
J03
1
+12V
2
GND
3
4
5
BUS 1
6
BUS 2
3
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