Eaton Network Adapter FCC 15 User Manual

Contents

Eaton Network Adapter FCC 15 User Manual Manual pdf 11 page image

EATON Powerware® Modbus® Card User’s Guide S 164201376 Rev C www.powerware.com 7Chapter 3 Wiring the Modbus CardThe Modbus Card provides an easy path for integrating a PowerwareUPS into an RS-485 Modbus network and also provides isolation of thecommunication between the UPS and the RS-485 Modbus network.You can use the DB-9 port or terminal strip on the Modbus Card to wireinto a two-wire or four-wire network.Two-Wire NetworksThe Modbus Card’s default configuration is for two-wire, half-duplex,RS-485 networks. Figure 6 shows a detailed view of two-wireconnections using the Modbus Card terminal strip.Slave Device #1Master DeviceSlave Device #2RT *RT **See NoteUPS withModbus Card RxD+ RxD–T-- R+T+ GndR-- T-- R+T+ GndR--T--R+T+GndR--Figure 6. Two-Wire RS-485 Modbus NetworkNOTE Only one transmission pair is used. It is not necessary to jumper the unused pairtogether (this connection is made internally). Belden 9841 or equivalent cabling (a singletwisted-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).