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2
RS485 Half-Duplex Interface
The RS485 half-duplex (3 wires + shield) interface is used for polled communication
protocols.
It can be used in a master/slave layout or for Multidrop connections with a Datalogic
Multiplexer, (see par. 2.6.4 and 2.6.5).
The connector pinout follows:
Pin
2
4
7
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 serial
channel by the WinHost utility or by ESC sequences.
16
DS2400
2
TX485+
4
TX485-
3
RX485+
RX485-
5
7
SGND
Figure 15 - RS485 full-duplex connections
Name
Function
RTX485+
RS485 transmit/receive data +
RTX485-
RS485 transmit/receive data -
SGND
signal ground
DS2400
2
RTX485 +
4
RTX485 -
7
SGND
Figure 16 - RS485 half-duplex connections
USER INTERFACE
+
RX485
-
+
TX485
-
+
SGND
MULTIPLEXER
RTX485 +
RTX485 -
RS485REF
DS2400
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