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INSTALLATION
9
2.8.2 Network Cabling
The Multidrop line is made using RJ45 connectors and a cable having the following
specifications:
• twisted pair AWG 24 wires
• 120 Ω impedance
• maximum network cable length 1200 meters
Pin Function Multidrop Cables
1 RS-485 +
2 RS-485 -
3 N.C.
4 VDC –
5 VDC –
6 N.C.
7 VDC +
8 VDC +
5
2
RJ45
5
2
RJ45
1 1
VDC-
RS-485-
RS-485+
Twisted Pair
–
RS-485 bus
8
5
2
RJ45
8
5
2
RJ45
1 1
Twisted Pair – RS-485 bus
Twisted Pair - Power supply
VDC+
VDC-
RS-485-
RS-485+
When wiring the multidrop cables, note the following:
Pin 8 (or 7) can be connected only if the power has to be propagated from a cradle to a
STARGATE™ base station or STAR-Box™ converter via the cable.
Pins 5 (or 4) should always be connected as reference ground.
To avoid excessive voltage drop, it is recommended not to propagate power between
BC-8060 cradles when used as battery chargers but to supply each cradle
individually. The total number of devices, which can be connected to a single power
supply, depends on the power supply voltage, the wire length and resistance and
therefore the voltage drop. Do NOT connect VDC+ between network devices that are
individually powered.
Data
only
Data
and
Power
Supply
Pin 1