Matrix-1000™ Reference Manual
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3.3.2 RS485 Half-Duplex 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 22 and par.
3.6.2).
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 22 - RS485 Half-Duplex Connections
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