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INSTALLATION
15
2
2.3.2 RS485 Half-Duplex Main Interface
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 Figure 13
and par. 2.6.2).
The following pins of the 25-pin connector are used for RS485 half-duplex
communication:
Pin Name Function
2 RTX485+ Transmitted/received data (+)
4 RTX485- Transmitted/received data (-)
7 SGND* Main reference ground
*SGND is internally connected to the GND through a filtering circuit.
MATRIX
4
RTX485-
RTX485+
2
MULITPLEXER
RTX485-
RTX485+
7
SGND
RS485REF
Earth
Ground
1
SHIELD
Figure 13 - RS485 Half-duplex Connections