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INSTALLATION
The custom cables have the following specifications:
•
twisted pair AWG 24 wires
•
120 Ω impedance
•
maximum network cable length 1200 meters
Pin
Function
1
RS485 +
2
RS485 -
3
N.C.
4
VDC –
5
VDC –
6
N.C.
7
VDC +
8
VDC +
RJ45
5
2
1
When wiring the multidrop cables, note the following:
As with all bus systems, the best overall performance is obtained by keeping cable
length to a minimum.
Pin 8 (or 7) should be connected only if power has to be propagated from a cradle to a
STARGATE™ base station or STAR-Box™ converter via the cable. See par 3.2 for
example network layouts.
Pins 5 (or 4) should always be connected as reference ground.
To avoid excessive voltage drop, it is recommended not to propagate power between
OM-3000 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.
VDC-
RS485-
RS485+
Twisted Pair - RS485 bus
Multidrop Cables
Pin 1
Data
only
Twisted Pair - Power supply
RJ45
RJ45
8
5
5
2
2
1
1
Data
and
Power
Supply
RJ45
VDC+
VDC-
RS485
RS485
Twisted Pair - RS485 bus
2
8
5
2
1
7
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