Datalogic QLM500 Manual de Instruções descarregar pdf (Página 88)

MATRIX 410™ REFERENCE MANUAL

5.4.3 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 available 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 following pins of the M16 19-pin connector are used for RS485 half-duplex

communication:

Name

Function

RTX+

RS485 Receive/Transmit Data (+)

RTX-

RS485 Receive/Transmit Data (-)

GND

Ground

MATRIX

RTX-

RTX+

MULITPLEXER

RTX485-

RTX485+

GND

RS485REF

SHIELD

Earth Ground

Chassis

Figure 79 - 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

VisiSet™ utility or by the Host Programming Mode.

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Datalogic QLM500 Manual de Instruções Página 88