Datalogic DS1500 Troubleshooting Guide download pdf (Page 26)

DS1500

RS485 Half-Duplex Interface

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. 2.6.3

and 2.6.4) 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:

Pin Name Function

6 RTX485+ RS485 transmit/receive data +

2 RTX485- RS485 transmit/receive data -

4 SGND signal ground

RTX485 +

RTX485 -

RTX485 +

RTX485 -

SGND

MULTIPLEXER

RS485REF

DS1500

SHIELD

Earth Ground

Figure 10 - RS485 Half-duplex Connections

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

In a Multiplexer layout or for slaves, the Multidrop address must also be set via the

serial channel by the WinHost utility or by ESC sequences.

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 63 64

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Datalogic DS1500 Troubleshooting Guide Page 26