Eaton Network Adapter FCC 15 User Manual

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Eaton Network Adapter FCC 15 User Manual Manual pdf 12 page image

WIRING THE MODBUS CARDEATON Powerware® Modbus® Card User’s Guide S 164201376 Rev C www.powerware.com8Four-Wire NetworksThe Modbus Card also supports four-wire, half-duplex, RS-485 networks.Figure 7 shows a detailed view of four-wire connections using theModbus Card terminal strip.Slave Device #1Master DeviceSlave Device #2*See NoteRT *RT *RT *RT *UPS withModbus Card RxD+ RxD–TxD+ TxD–T--R+ T+Gnd R-- T--R+ T+Gnd R--T--R+T+GndR--Figure 7. Four-Wire RS-485 Modbus NetworkNOTE Belden 9842 or equivalent cabling (a dual twisted-pair shielded cable with ground)is recommended.NOTE If the Modbus Card is the last device installed in the network chain or the length ofthe network cable is excessive, termination needs to be enabled (see page 10).RS-485 Terminal StripThe RS-485 five-position terminal strip provides an alternate interface toattach the RS-485 transmission lines. This connector also allows externalresistors to be applied to terminate the network.Before connecting the RS-485 network to the Modbus Card, remove thedetachable plug from the 5-pin terminal strip connector. The RS-485signal names are shown just above the connector (see Figure 8).For two-wire networks. Connect the RS-485 network signal TxD(+) to theRxD(+) input signal on the Modbus Card terminal strip. Connect theRS-485 network signal TxD(–) to the RxD(–) input signal on the ModbusCard terminal strip. The Modbus Card factory-default jumper setting forJ9 and J10 is two-wire communication.