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DS1500
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2.6.3 RS232 Master/Slave
The RS232 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 9 slaves connected together.
The Slave scanners use RS232 only on the main and auxiliary serial interfaces. Each
slave DS1500 transmits the messages received by the auxiliary interface onto the main
interface. All messages will be passed through this chain to the Master.
The Master scanner is connected to the Host on the main serial interface. The main
interface type for the master scanner is RS232.
There is a single reading phase and a single message from the master scanner to the
Host computer.
Either
On-Line or Serial On-Line Operating modes can be used in this layout.
When On-Line Operating mode is used, the external trigger signal is unique to
the system, however it is not necessary to bring the external trigger signal to the
Slave scanners.
The main and auxiliary ports are connected as shown in the figure below.
Host
1
2
3
1
2
3
Main serial interface
A
uxiliary serial interface
External Trigger (for On-Line mode)
2
DS1500
Slave
1
1
DS1500
Slave
DS1500
Master
Figure 21 – RS232 Master/Slave Layout
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