Transparent Mode - Microscan MS-3 User Manual

RS-232 Auxiliary Port

Transparent Mode

Usage: A common application, in conjunction with handheld scanners, is one that
employs an auxiliary readout to detect mis-applied bar code symbols.
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.
Data initiated from the Auxiliary Port
• Auxiliary port data is passed through to the host whenever a return
key is pressed at the auxiliary port or symbol data is sent.
• Whenever aux port data is sent with symbol
data, the aux port data will appear between the
preamble and the symbol data.
• 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 NOT pass through.
• <D>
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 imme-
diately 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 and polled mode.
Serial Cmd: <K101,aux port
ID status,daisy chain ID>
1 = Transparent
MS-3 Laser Scanner User's Manual
3-14
is the only command accepted by the
mode,baud rate,parity,stop bits,data bits,daisy chain
Aux Aux
Host Host
Port Port
Scanner Scanner
Aux
Host
Port
Scanner
Aux
Host
Port
Scanner