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INSTALLATION
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 with a Datalogic Multiplexer, (see par. 2.6.3
and 2.6.4) exploiting a proprietary protocol based on polled mode called MUX32
protocol, where a master device polls slave devices to collect data.
The connector pinout follows:
Pin Name Function
6 RTX485+ RS485 transmit/receive data +
2 RTX485- RS485 transmit/receive data -
4 SGND signal ground
RTX485 +
6
RTX485 -
2
RTX485 +
RTX485 -
4
SGND
MULTIPLEXER
RS485REF
DS1500
13
SHIELD
Earth Ground
Figure 9 - RS485 Half-duplex Connections
This interface is forced by software when the protocol selected is MUX32 protocol.
In a Multiplexer layout or for slaves, the Multidrop address must also be set via the
serial channel by the WinHost utility or by ESC sequences.
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