Datalogic Matrix 450, Reference Manual

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MATRIX 450™ REFERENCE MANUAL
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4
NOTE
For applications that do not use RX485 signals, do not leave these lines
floating but connect them to SGND as shown below.
RX485+
SGND RX485-
USER INTERFACE
SGND TX+
TX-
READER
Figure 32 - RS485 Full-duplex Connections using Only TX Signals
4.2.3 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, exploiting a proprietary
protocol based on polled mode called MUX32 protocol, where a master device polls slave
devices to collect data.
CBX100/500 Function
RTX+ RS485 Receive/Transmit Data +
RTX- RS485 Receive/Transmit Data -
SGND Signal Ground
SGND RTX485-
USER INTERFACE
SGND RTX+
RTX-
READER
Figure 33 - RS485 Half-duplex Connections