Powerware FCC 15 Manual de usuario descargar pdf (Pagina 14)

WIRING THE MODBUS CARD

EATON Powerware

Modbus

Card User’s Guide S 164201376 Rev C www.powerware.com

245

Figure 9. RS-485 DB-9 Pin Numbers

Table 2. RS-485 DB-9 Pin Assignments

Pin Number Modbus Card Signal Name

RS-485 Network Signals

Master Signal Name

1 RxD(+) TxD(+)

2 TxD(+) RxD(+)

3 Signal common Signal common

4 Reserved —

5 Reserved —

6 RxD(–) TxD(–)

7 TxD(–) RxD(–)

8 Reserved —

9 Reserved —

Termination

CAUTION

Termination resistors should be placed only at the extreme ends of the RS-485 network. No

more than two termination points should be used in the RS-485 network.

Termination is not required unless the Modbus Card is located at the

end of the RS-485 network or the length of the network cable is

excessive.

If receive termination is required, an on-board 120 ohm termination

resistor may be selected by setting S2-3 to the ON position. A 120 ohm

resistor will be placed in parallel with the RxD(+) and RxD(–) lines (see

Figure 10).

If transmit termination (four-wire networks) is required, an on-board

120 ohm termination resistor may be selected by setting S2-4 to the ON

position. A 120 ohm resistor will be placed in parallel with the TxD(+)

and TxD(–) lines (see Figure 10).

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Powerware FCC 15 Manual de usuario Pagina 14