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12.4
RS485 Master/Slave
The RS485 master/slave connection is used to collect data from several scanners to
build a multi-point or a multi-sided reading system; there can be one master and up
to 5 slaves connected together.
The slave scanners are connected together using RS485 half-duplex on the main
serial interface. Every slave scanner must have a multidrop address in the range 0-4.
The master scanner is also connected to the Host on the RS232 auxiliary serial
interface.
The External Trigger signal is unique to the system; there is a single reading phase
and a single message from the master scanner to the Host computer.
It is necessary to bring the External Trigger signal to all the scanners.
The main and auxiliary ports are connected as shown in the figure below.
Figure 12.4 RS485 Master/slave layout
The auxiliary serial interface of the slave scanners can be used in Local
Echo communication mode to control any single scanner (visualize
collected data) or to configure it using the VisoSetup utility or Host
Mode programming procedure.
Information
The termination resistors of the RS485 bus must not be installed.
Subject to reasonable modifications due to technical advances.
Pepperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
1 Auxiliary serial interface
2 RS485HD Main serial interface
3 External Trigger
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SLAVE
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TYPICAL LAYOUTS
Host
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Copyright Pepperl+Fuchs, Printed in Germany
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MASTER
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