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WIRING THE MODBUS CARD
EATON
Powerware
®
Modbus
®
Card User’s Guide
S
164201376 Rev C
www.powerware.com
10
3
8
7
9
1
6
2
4
5
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
C A U T I O N
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).
Содержание Network Adapter FCC 15
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