Rs485 Half-Duplex Interface - Datalogic DS2100N Reference Manual

5

5.2.3 RS485 Half-Duplex Interface

This interface is provided for backward compatibility. We recommend using
the more efficient ID-NET™ network for Master/Slave or Multiplexer layouts.
NOTE
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
2 RTX+
4 RTX-
7 GND
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 DS2100N scanners connected to a
Multiplexer.
This is an example of multidrop wiring. Consult the multiplexer manual for
complete wiring instructions.
CAUTION
52
Function
RS485 Receive/Transmit Data +
RS485 Receive/Transmit Data -
Ground
DS2100N
2
RTX+
4
RTX-
7
GND
Chassis 1
Figure 49 - RS485 Half-duplex Connections
DS2100N REFERENCE MANUAL
MULTIPLEXER
RTX485 +
RTX485 -
RS485REF