Microscan MS-820 Uživatelský manuál Strana 31

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Chapter 2 Communications
MS-820 Industrial Bar Code Scanner User’s Manual 2-7
2–Communications
Tra ns par en t Mode
Definition: In Transparent mode data is passed between the auxiliary port and
the host. The scanner buffers data from the auxiliary port and echoes
the keyed data on the auxiliary port.
Auxiliary port data is passed through to the
host whenever a return key is pressed at the
auxiliary port or whenever bar code data is
sent. If sent with bar code data, it is processed
on a first-in/first-out basis.
Auxiliary port data to the host is always sent
with a preamble and a postamble.
If the scanner is in a polled mode to the host,
auxiliary port data will still pass through.
<D> is the only command accepted by the scanner from the auxiliary
port. All other commands will pass through to the host.
Data initiated from the Scanner
Transmission to the auxiliary port occurs
immediately upon a good read.
Scan data to the auxiliary port does not include
a preamble or a postamble.
Communications with the auxiliary port is
always in Point-to-Point protocol, even if the
host is in a polled protocol mode.
Data initiated from the Host
All host data is echoed to the auxiliary port in
unpolled mode.
Usage: A common application, in conjunction with handheld scanners, is one
that employs an auxiliary readout to detect mis-applied bar code labels.
Serial Cmd: <Kyaux port mode,baud rate,parity,stop bits,data bits,daisy chain ID
status,daisy chain ID>
1 = Transparent
Scanner
Host
Aux
Port
Scanner
Host
Aux
Port
Scanner
Host
Aux
Port
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