Microscan MS-3 Manual Book page 28

Auxiliary Port
Half Duplex Mode
Definition: In Half Duplex mode all auxiliary port data and bar code data is sent
directly to the host. Bar code 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> is the only command that is accepted by the scanner from the
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 parame-
ters specified in the configuration menu (e.g.,
Preamble, Postamble, End of Read Cycle).
Data is initiated from the Host
• All host data is echoed to the auxiliary port in
unpolled mode.
Usage: Useful when the user wants bar code data displayed on an auxiliary
screen close to the scanner.
Serial Cmd: <K101,aux port
ID status,daisy chain ID>
2 = Half Duplex
MS-3 Laser Scanner User's Manual
2-8
mode,baud rate,parity,stop bits,data bits,daisy chain
Aux
Host
Port
Scanner
Aux
Host
Port
Scanner
Aux
Host
Port
Scanner