Rockwell-automation 2755 AtomScan Bar Code Reader Manual de usuario descargar pdf (Pagina 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 <D> 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 <B_>.

•in unpolled mode, all host data is echoed to the

monitor.

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Rockwell-automation 2755 AtomScan Bar Code Reader Manual de usuario Pagina 97