Datalogic Scanning Matrix 400 - Manual (Page 77)

19-PIN CONNECTOR ELECTRICAL CONNECTIONS
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5
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:
Pin Name Function
M RTX+ RS485 Receive/Transmit Data (+)
N RTX- RS485 Receive/Transmit Data (-)
L GND Ground
MATRIX
RTX-
RTX+
MULITPLEXER
RTX485-
RTX485+
GND RS485REF
SHIELD
N
M
L
K
Earth Ground Earth Ground
Chassis
Figure 80 - 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.