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DS2400 DATALOGIC
2.22
- 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.
Host
DS2400 Master
2
Auxiliary serial interface
1
RS485 HD Main serial interface
3
External Trigger
DS2400
Slave
DS2400 Slave
2
1
3
1
1
Figure 2.31 - RS485 Master/Slave layout