Microscan MS-3 User Manual page 53

Half Duplex Mode
Usage: Useful when the user wants symbol data displayed on an auxiliary screen
close to the scanner.
Definition: In Half Duplex mode all auxiliary port data and symbol data is sent
directly to the host. Symbol data is displayed on the auxiliary port screen
at the same time the data is sent to the host.
Data initiated from the Auxiliary Port
• Auxiliary port data to the host is ignored if the
scanner is in a polled mode.
• Auxiliary port data or scanned data is sent to
the host whenever it is received.
• Auxiliary port data is not echoed.
• Auxiliary port data to the host is always sent
without a preamble or a postamble.
• <D>
auxiliary port. All other commands are passed through to the host.
Data initiated from the Scanner
• Scan data is transmitted to the auxiliary port at
the same time it is transmitted to the host.
• Data transmission conforms with all parameters
specified in the configuration menu (e.g., Pre-
amble, Postamble, End of Read Cycle).
Data is initiated from the Host
• All host data is echoed to the auxiliary port in
unpolled mode.
Serial Cmd: <K101,aux port
ID status,daisy chain ID>
2 = Half Duplex
is the only command that is accepted by the scanner from the
mode,baud rate,parity,stop bits,data bits,daisy chain
Chapter 3 Communications
MS-3 Laser Scanner User's Manual
Aux
Host
Port
Scanner
Aux
Host
Port
Scanner
Aux
Host
Port
Scanner
3-15