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PM1000 Series Power Meters PLSED309039EN

Chapter 6 – Data Communication 08/2010

Figure 6-2: Closed loop, 2-wire half duplex.

Advantage – Reliable communications, tolerant to one break in the

cable.

Communication Capabilities

Table 6-1: RS 485 communication distances

NOTE: Distances listed should be used as guide only and cannot be guaranteed for non-

PowerLogic devices. Above distances subject to vary based on the quality of the cable.

Daisy-chaining Devices to the Power Meter

RS 485 slave port allows the power meter to be connected in a daisy chain

with up to 31 2-wire devices. In this bulletin, communications link refers to a

chain of devices that are connected by a communications cable. See Figure

6-3.

Figure 6-3: Daisy-chaining 2-wire devices

NOTE: Belden 3105A/9841 colors: Blue (+), White (-)

 If the power meter is the first device on the daisy chain, connect it to the

host device using a RS 232 to RS 422/RS 485 converter or RS 485 to

Ethernet converter.

PM1200 power meters rear view

RS485

communication port

RS485 Data

Converter

RS485

RS232

Baud Rate

Maximum communication distances 1 to 32 devices

Meters ( Typical with Belden 3105A cables)

9600

1200

19200

900

Belden 3105A/9841 or

equivalent

MCT2W-485 terminator

on the last device of

the daisy chain

Power Meter 1200 or other POWERLOGIC 2-wire compatible devices

Towards PC

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Schneider Electric K series Manual do Utilizador Página 48