GE EPM 5200 User Manual

Page 27

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CHAPTER 4: COMMUNICATION INSTALLATION

GE Multilin EPM 5000 series Advanced Power Meters

23

4.3: Network of Instruments and Long Distance Communication

The RS-485 Transceiver is required for a large network of instruments.

• In a two-wire connection, a maximum of 900 instruments can be included in the same network

(Figure 4.7)

• In a four-wire connection, a maximum of 3600 instruments can be included in the same network

(Figure 4.8).


Figure 4.7: 2-Wire RS-485 Communication Installation Connection with Transceiver

Figure 4.8: 4-Wire RS-485 Communication Installation Connection with Transceiver



Use modems (dedicated or dial-up) when the instruments are located at great distances. However, set
the modem to auto answer at the recommended value of 1200 baud rate, if noise conditions exist. Also,
flow control must be disabled.






DEVICE

DEVICE

DEVICE

DEVICE

RS-485

TRANSCEIVER

(Acts as Repeater)

RS-485

TRANSCEIVER

(Acts as Repeater)

32

TRANSCEIVERS

32 UNITS

32 UNITS

COMPUTER

DEVICE

DEVICE

DEVICE

DEVICE

RS-485

TRANSCEIVER

(Acts as Repeater)

RS-485

TRANSCEIVER

(Acts as Repeater)

32

TRANSCEIVERS

32 UNITS

32 UNITS

COMPUTER

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