Datalogic DS4800 Reference Manual

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Datalogic DS4800 Reference Manual Manual pdf 44 page image

DS4800 REFERENCE MANUAL44.2.2 RS485 Full-Duplex InterfaceThe RS485 full-duplex (5 wires + shield) interface is used for non-polled communicationprotocols in point-to-point connections over longer distances (max 1200 m / 3940 ft) thanthose acceptable for RS232 communications or in electrically noisy environments.The CBX pinout follows:CBX100/500 FunctionTX+ RS485 Transmit Data +RX+ RS485 Receive Data +TX- RS485 Transmit Data -RX- RS485 Receive Data -SGND Signal GroundRX485+ TX485+SGND RX485- TX485-USER INTERFACESGND TX+ RX+TX- RX-SCANNERFigure 24 - RS485 Full-duplex ConnectionsNOTEFor applications that do not use RX485 signals, do not leave these linesfloating but connect them to SGND as shown below.RX485+SGND RX485-USER INTERFACESGND TX+TX-SCANNERFigure 25 - RS485 Full-duplex Connections using Only TX Signals36