Datalogic QLM500 Manuel d'installation télécharger pdf (Page 71)

25-PIN CABLE ELECTRICAL CONNECTIONS

5.2.3 RS485 Half-Duplex Interface

NOTE

This interface is provided for backward compatibility. We recommend using

the more efficient ID-NET™ network for Master/Slave or Multiplexer layouts.

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

protocols.

It can be used for Multidrop connections with a Datalogic Multiplexer, (see par. 6.5) exploiting

a proprietary protocol based on polled mode called MUX32 protocol, where a master device

polls slave devices to collect data.

The connector pinout follows:

25-pin

Name

Function

RTX+

RS485 Receive/Transmit Data +

RTX-

RS485 Receive/Transmit Data -

GND

Ground

RTX+

RTX-

RTX485 +

RTX485 -

GND

MULTIPLEXER

RS485REF

DS2400N

Chassis

Figure 67 - RS485 Half-duplex 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 68 shows a multidrop configuration with DS2400N scanners connected to a

Multiplexer.

CAUTION

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

complete wiring instructions.

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Datalogic QLM500 Manuel d'installation Page 71