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INSTALLATION – DX8200 SERIAL INTERFACE
2.5.3
RS485 Master/Slave
The RS485 Master/Slave connection is used to collect data from several scanners to build
either a multi-sided or extended-width omnidirectional reading system; there can be one
Master and up to 2 Slaves connected together.
The Master and Slave scanners are connected together using RS485 half-duplex on the
auxiliary serial interface.
The Master scanner is also connected to either a Host or a Multiplexer on the main serial
interface. The possible main interface type selections are RS232 or RS485 full-duplex for
Host connections or RS485 half-duplex for Multiplexer connections (see "Main Interface
Selection" in par. 2.2.1).
For the Slave scanners the Multidrop Address Selection can be made using the DIP switch.
The addresses must be consecutive and not include zero for hardware configuration, or be
selected in software (in this case the DIP switch address must be zero for each Slave). See
par. 2.2.2.
The main serial port of the Slave scanners can be used for configuration.
The termination resistors of the RS485 bus must not be installed.
NOTE
Single P.S.
The P.S. signal is unique to the system; there is a single reading phase and a single
message from the master scanner to the Host.
This is the Master/Slave layout connection for PackTrack operating mode. On-Line
operating mode can also be used for this layout.
Connection cables are available as accessories for the Master/Slave Single P.S. layout. See
Figure 32.
Slave
DX8200
Slave
3
1
Main serial interface
2
Auxiliary serial interface: RS485 Half-duplex
3
Presence sensor
Figure 31 - Master-slave Single P.S. layout
1
DX8200
2
DX8200
Master
MULTIPLEXER
MX4000
RS485 Half-duplex
HOST
PC or PLC
RS232
RS485 Full-duplex
2
27
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