Rockwell Automation 2755 AtomScan Bar Code Reader - Manual (Page 97)

6–12 Hardware Operation
Publication 2755-6.9
Transparent mode is used to batch data from the auxiliary monitor to
the host. The decoder buffers data from the auxiliary monitor and
displays the keyed data on the auxiliary monitor. The decoder
transmits auxiliary monitor data to the host when a label is scanned
or a carriage return is entered from the auxiliary monitor.
When Then
Data is initiated from the monitor
•
monitor data is passed through to the host
whenever a return key is pressed at the monitor
or whenever bar code data is sent. If monitor
data is sent with bar code data, monitor data is
processed first-in/first-out basis.
•
monitor data to the host is always sent with a
preamble and a postamble.
•
monitor data will still pass through if the decoder
is in a polled mode to the host.
•
a command is the only command accepted
by the decoder from the monitor. All other
commands will pass through to the host.
Data is initiated from the reader
•
transmission to the monitor occurs immediately
upon a good read.
•
scan data to the monitor does not include a
preamble or a postamble.
•
transmission to the host conforms to all the
parameters specified in the configuration menu.
•
communications with the monitor is always
point-to-point protocol even if the host is in a
polled protocol mode.
Data is initiated from the host
•
in a polled mode, data echoed from the host to
the monitor must be in the format .
•
in unpolled mode, all host data is echoed to the
monitor.