Barcode reader VB34
Installation
Da
te
of
issue
06/
1
3
/2005
25
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
Fuchs Group • Tel.: G49 621 776-0 • USA +1 330 4253555 • Sin65 67799091 • Internet http://www.pepperl-fuchs.com
If the RTS/CTS handshake protocol is active, the VB34 reader sets the RTS output in
order to indicate that it wants to transmit a message. The receiver activates the CTS
to start the transmission.
Figure 6.12
Connection layout of the RS232 interface
RS485 interface (full duplex)
The RS485 full-duplex interface is suited for continuous (not running in dialog
operation) communication protocols in point-to-point configuration. In this case,
greater distances and a higher tolerance towards electrical interfering signals
compared with the RS232 interface can be realised.
In full-duplex operation, the RS485 interface uses the following pins of the 25-pin or
26-pin connector:
Figure 6.13
Connection layout of the RS485 interface (full duplex)
RS485 interface (half duplex)
The RS485 interface in half-duplex operation is suited for Multidrop connections with
a VISOLUX Multiplexer or for master/slave configurations.
In half-duplex operation, the RS485 interface uses the following pins of the 25-pin or
26-pin connector:
Pin
Description
Function
2
TX485+
RS485 output (+)
3
RX485+
RS485 input (+)
4
TX485-
RS485 output (-)
5
RX485-
RS485 input (-)
7
GND_ISO
Signal ground