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DS8100A REFERENCE MANUAL

4.2.3 RS485 Half-Duplex Interface

NOTE

This interface is provided for backward compatibility. We recommend using

the more efficient Lonworks network for Master/Slave or Multiplexer layouts.

The RS485 half-duplex (3 wires + shield) interface can be used for polled communication

protocols.

It can be used for Multidrop connections with a Datalogic Multiplexer, (see par. "Multiplexer"

in Appendix A) exploiting a proprietary protocol based

on polled mode called MUX32

protocol, where a master device polls slave devices to collect data. The overall maximum

cable length should not exceed 1200 m (3940 ft).

The following pins of the 26-pin connector are used for RS485 half-duplex interface

connection:

Pin Name Function

2 RTX+ RS485 input/output (+)

4 RTX- RS485 input/output (-)

7 GND_ISO Main signal ground

DS8100A

GND_ISO

RTX485+

RTX485-

RS485REF

MULTIPLEXER

RTX485-

RTX485+

Earth

Ground

CHASSIS

Figure 49 – RS485 Half-Duplex Interface Connections

This interface is forced by software when the protocol selected is MUX32 protocol.

In a Multiplexer layout, the Multidrop address must also be set via serial channel by the

Genius™ utility or by the Host Programming Mode.

Figure 50 shows a multidrop configuration with DS8100A scanners connected to a

ultiplexer.

CAUTION

This is an example of multidrop wiring. Consult the multiplexer manual for

complete wiring instructions.

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Datalogic DS8100A-3115 Installationshandbuch Seite 54