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INSTALLATION
2.6.4
RS485 Master/Slave
The RS485 master/slave connection is used to collect data from several scanners to
build either 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.
Auxiliary serial interface
1
RS485HD Main serial interface
2
External Trigger
3
DS2400
Slave
1
1
PWR/TXD
EXT TRIG
GOOD READ
LAS ER ON
DS2400
Figure 31 - RS485 Master/Slave layout
Host
DS2400
Slave
3
2
DS2400
Master
2
1
27
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