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Data Communication Settings
47
Pass Through Options
Pass Through mode allows two or more devices to be connected to a single external serial interface. The scanner
transmits messages received by its auxiliary interface (RS232 only) onto its main interface.
In this configuration a series of scanners can be connected together using RS232 on the main interface and all
messages will be passed through this chain to the host. The reading phase of each scanner is independent from the
others in a Pass Through chain.
Applications can also be implemented to connect a device such as a hand-held reader to the Auxiliary port for
additional manual code reading capability.
For the description of these layouts refer to the scanner Reference Manual under "Typical Layouts".
When using Pass Through mode, follow these programming notes:
1.
Program the serial ports in the same way regarding baud rate, data bits, stop bits and parity on al the devices in
the Pass Through chain.
2.
The Termination string must be configured in the same way as the message terminator on the device connected
to the Auxiliary port. The terminator will be forwarded with the message.
3.
The Serial On-Line, Master/Slave and Crisplant protocol parameters are not configurable for the Auxiliary
interface.
String Max Length
It defines the maximum length of the expected string to be received. In case the string is longer than the one
expected, it will be discarded.
Termination String
It defines the characters terminating the expected string.
Pass Through on ID-NET™
If the scanner is set as a Slave (MULTIDATA), the Pass Through network can be made using ID-NET™ which is faster
and it also frees up the Aux serial channel so that each Slave scanner can accept input data, for example from a hand-
held reader.
The Main Serial Interface always echos the Aux interface data and can be used to monitor this data.
Auxiliary Serial Port Parameters
Baud Rate
Baud rate is the transmission speed in a communication line.
Selections: from
1200
to
115200
Parity
Parity is a parameter indicating the presence of a control bit in the communication protocol frame.
Selections:
None
Odd
Even
Data Bits
Data Bits is a parameter indicating the number of bits composing the data packet of the communication protocol
frame.
Stop Bits
Stop Bits is a parameter indicating the number of stop bits in the data packet of the communication protocol frame.