PLX3x Series ♦ Multi-Protocol Gateways Hardware Information
User Manual
ProSoft Technology, Inc. Page 47 of 215
January 25, 2018
4.2.5 RS-485 Interface Connection
The following illustration applies when the RS-485 interface is selected.
NOTE: This type of connection is commonly called a RS-485 half-duplex, 2-wire connection. If you
have RS-485 4-wire, full-duplex devices, they can be connected to the gateway's serial ports by
wiring together the TxD+ and RxD+ from the two pins of the full-duplex device to Pin 1 on the
gateway and wiring together the TxD- and RxD- from the two pins of the full-duplex device to Pin 8
on the gateway. As an alternative, you could try setting the gateway to use the RS-422 interface
and connect the full-duplex device according to the RS-422 wiring diagram. For additional
assistance, please contact ProSoft Technical Support.
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