Installation manual

INSTALLATION
13
2
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. 2.5.4 and 2.5.5).
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
DS4600A
MULTIPLEXER
RTX485+
2
RTX485-
4
RTX485+
RTX485-
7
SGND Main
RS485REF
Figure 9 - RS485 Half-Duplex Connections