Rs485 Half-Duplex Interface - Datalogic Compact 2D Reader Matrix-2000 Reference Manual

CBX ELECTRICAL CONNECTIONS

4.2.3 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. 6.4) exploiting
a proprietary protocol based on polled mode called MUX32 protocol, where a master device
polls slave devices to collect data.
CBX100/500
RTX+
RTX-
SGND
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.
Figure 47 shows a multidrop configuration with Matrix-2000™ readers connected to a
Multiplexer.
This is an example of multidrop wiring. Consult the multiplexer manual for
complete wiring instructions.
CAUTION
Function
RS485 Receive/Transmit Data +
RS485 Receive/Transmit Data -
Signal Ground
SGND RTX+
READER
Figure 46 - RS485 Half-duplex Connections
USER INTERFACE
RTX485+
SGND RTX485-
RTX-
4
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