3-4SectionConnecting a Bar Code Reader
30
Item Default SettingPossible Settings
Baud rate 4800, 9600, 19200 bps 9600 bps
Input Method
Manual, Auto Manual
Make
the settings shown in the table below
at the bar code reader
. Make sure
that
the baud rate, parity
, stop bit, and data bit settings match the communication
settings
made at the NT21. For details on the setting method, refer to the opera
-
tion manual for the bar code reader used.
Item Possible Settings
Baud rate 4800, 9600, 19200 bps
Parity EVEN, ODD, NONE
Stop bits 1 or 2 bits
Data bits 7 or 8 bits
Preamble STX
Postamble ETX
RS/CS control Available
Communication protocol No-protocol mode
Transmission of number of bar code label digits Transmission prohibited
Transmission of ID characters Transmission prohibited
Bar code types Multi-reading (all types can be
read)
Trigger switch setting Automatic reading mode
About RS/CS Control
During bar code reading, the NT21 performs RS/CS control. When the Input
Method
setting of the NT21 is set to Auto, the RS signal is turned OFF
, prohibit
-
ing the next input, until the read data is notified to the host.
Because of this, when the Auto setting is made, the next input is not possible
until the data is 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 NT21 is updated regardless of whether or not the data is noti
-
fied to the host.
For details, refer to the operation 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
NT21 is shown below.
Data Data DataSTX ETX
(03
H)(02H)
The
characters that are ef
fective
as data are hexadecimal codes from 20 to 7F
H,
and the maximum data length is 40 bytes.
Data
that does not follow the data format described above is
invalidated and dis
-
carded.
Settings at the Bar Code
Reader
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