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VB24
5.2.3 RS485 Half-Duplex Interface
This interface is provided for backward compatibility. We recommend using
the more efficient ID-NET™ network for Master/Slave or Multiplexer layouts.
NOTE
The RS485 half-duplex (3 wires + shield) interface is used for polled communication protocols.
It can be used for Multidrop connections with a Pepperl+Fuchs GmbH Multiplexer, (see par.
6.5) 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:
25-pin
Name
2
RTX+
4
RTX-
7
GND
This interface is forced by software when the protocol selected is MUX32 protocol.
In a Multiplexer layout, the Multidrop address must also be set via serial channel by the
Genius™ utility or by the Host Programming Mode.
Figure 50 shows a multidrop configuration with VB24 scanners connected to a Multiplexer.
This is an example of multidrop wiring. Consult the multiplexer manual for
complete wiring instructions.
CAUTION
58
Function
RS485 Receive/Transmit Data +
RS485 Receive/Transmit Data -
Ground
VB24
2
RTX+
4
RTX-
7
GND
Chassis
1
Figure 49 - RS485 Half-duplex Connections
MULTIPLEXER
RTX485 +
RTX485 -
RS485REF
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