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GE EPM 5300 Manuale Utente Pagina 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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