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INSTALLATION
2
DS4600
A
USER INTERFACE
7
SGND Main
TX485+
2
TX485-
4
RX485+
3
RX485-
5
RX485
TX485
RS485REF
Earth
Ground
Figure 10 - RS485 Full-Duplex Connections
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 in a master/slave layout or with a Datalogic
Multiplexer, (see par. 2.6.4 and 2.6.5).
The following pins of the 25-pin connector are used for RS485 half-duplex
communications:
Pin Name Function
2 RTX485+ RS485 transmitted/received data +
4 RTX485- RS485 transmitted/received data -
7 SGND Main signal ground main interface
DS4600
A
MULTIPLEXER
RTX485+
2
RTX485-
4
RTX485+
RTX485-
7
SGND Main
RS485REF
Figure 11 - RS485 Half-Duplex Connections
11