2

DS1500

 

2.6.3RS232 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.

DS1500

Slave

DS1500

2

1

 

Slave

1

2

DS1500

Master

 

 

 

3

1

Main serial interface

Host

1

 

 

 

2

Auxiliary serial interface

 

 

3

External Trigger (for On-Line mode)

 

 

Figure 21 – RS232 Master/Slave Layout

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