INSTALLATION

2.8.2Network 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

PinFunctionMultidrop Cables

 

1

RS-485

+

Pin 1

Data

2

RS-485

-

 

and

3

N.C.

 

 

Power

4

VDC –

 

 

Supply

5VDC –

6N.C.

7VDC +

8

VDC +

 

 

 

Data

 

 

 

 

 

 

 

 

 

 

 

only

 

 

 

 

RJ45

 

 

 

 

RJ45

Twisted Pair - Power supply

RJ45

 

RJ45

VDC+

 

 

 

VDC-

 

 

 

8

 

 

 

 

8

5

 

 

 

5

 

 

VDC-

 

 

 

 

RS-485-

 

5

 

 

 

5

2

 

 

2

 

 

RS-485-

 

 

 

RS-485+

2

 

 

2

1

 

 

 

 

1

 

 

RS-485+

 

 

 

 

1

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

Twisted Pair – RS-485 bus

Twisted Pair – RS-485 bus

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.

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