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Connecting a Bar Code Reader
Section 3-4
S About RS/CS control
During bar code reading, the NT31/NT31C performs RS/CS control. When the
“Input Method” setting of the NT31/NT31C is set to “Auto”, the RS signal is
turned OFF, prohibiting the next input, until the read data has been notified to the
host.
Because of this, when the “Auto” setting is made, the next input is not possible
until the data has been notified to the host.
However, when the setting is “Auto” and the RS/CS signals of the cable are
shorted, RS/CS control is ineffective. Consequently, data input from the bar
code reader to the NT31/NT31C is updated regardless of whether or not the data
is notified to the host.
For details, refer to the instruction manual for the bar code reader used.
3-4-3 Data Format
The data format for communication when using the bar code input function of the
NT31/NT31C is shown below.
Data Data DataSTX ETX
(03
H)(02H)
The characters which are effective as data are hexadecimal codes from 20 to 7FH,
and the maximum data length is 40 bytes.
Data which does not follow the data format described above is invalidated and dis-
carded.
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