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INSTALLATION
2.5.3
RS232 Master/Slave
The RS232 master/slave connection is used to collect data from several decoders to
build a multi-sided reading system; there can be one master and up to 9 slaves
connected together.
The slave decoders are connected to the main and auxiliary serial interfaces. Each
slave DP1200 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 decoder is connected to the Host on the main serial interface. The
possible main interface types for the Master decoder are RS232, RS485 or 20 mA
C.L..
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 decoders.
The main and auxiliary ports are connected as shown in the figure below.
DP1200 Master
1
Host
2
3
Main serial interface
1
Auxiliary serial interface
2
3
External Trigger (for On-Line mode)
Figure 26 - RS232 Master/Slave layout
LSXXXX
reader
2
DP1200 Slave
1
LSXXXX
reader
27
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