21
Using the screw terminal interfaces:
The wire colours below assume the use of the recommended cable and follow
the ChallengerPlus LAN conventions.
For communications, the following connections are required:
• The - terminal is the interface 0V reference. Connect it to the black
wire.
• The D+ terminal is data positive. Connect it to the white wire.
• The D- terminal is data negative. Connect it to the green wire.
• The data cable shield should be connected or insulated according to
the system earthing plan. Earthing points are identified on figure 2 as
items 2 and 4.
On the RS485 BUS1 and BUS2 interfaces, the +12 terminal is able to
provide +12 V to RASs or other remote devices. Connect the +12
terminal to the red wire when using this feature.
Note: Devices connected to the RS-485 buses and powered by the
Network Access Controller must comply with Appendix B: Output
fusing and user current limits on page 34.
When multiple devices are to be connected to the same network, the
use of TS0844 or TS1044 Power Distribution Boards is recommended
to increase the number of terminals and simplify the wiring effort.
To prevent failures, false alarms and hazards, all wires inside the
enclosure should be insulated up to the point of contact. Typically less
than 2mm of bare conductor should be exposed outside of the screw
terminal blocks and all conductor strands bound by the crew.
Damaged insulation, poor workmanship and other observed faults
must be corrected as soon as possible.
Using the plug-in BUS 1 sockets:
To easily connect a Tecom peripheral to BUS 1, connect a 4-way RS-485
cable (supplied with the Tecom peripheral) to one of the 4-pin plug-in RS-485
cable sockets (Figure 2 on page 12, items 14).
Refer to Figure 4 on page 22 for example connections of 4-way RS-485
cables from a Network Access Controller to a Tecom peripheral (items A and
B).
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