DS2100
24
2
2.5.4 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.
1
2
3
Auxiliary serial interface
RS485HD Main serial interface
External Trigger
Host
DS2100
Slave
DS2100
Slave
DS2100
Master
1
1
1
2
3
Figure 25 – RS485 Master/slave layout
NOTE
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 WinHost utility or
Host Mode programming procedure.
The termination resistors of the RS485 bus must not be installed.
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