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Software Usage and Examples
BAR CODE SOFTWARE
The
HP
82718A includes software that decodes two types of bar code labels, Code 39 and Code 11, when
scanned by a digital bar code wand and the HP-7SD. The decoders are compatible with switched and
unswitched wands, high resolution infrared wands (wavelength 830-920 nm), and medium resolution
visible light wands (wavelength 700 nm).
The
CODE:::9$
and
CODE 11 $
keywords scan Code 39 and Code 11 bar code labels up to 42 characters
long (including the check digit) and decode them into strings of ASCII characters. Audible feedback
indicates good and bad scans. The keywords
CD I G ITO
t·~
and
CD I G ITO F F
(default behavior) allow
you to specify whether the decoders should automatically verify the check digit while scanning. For
unreadable labels,
CD'· . . . :::9
and
CD'·.·'ll
verify the check digits of labels entered from the keyboard.
The bar code commands duplicate commands that exist in the
HP
82 nSA Bar Code Reader Module (see
appendix C for details).
Scanning a Bar Code Label
To scan a label, enter the keyword for the type of label to be decoded (either
CODE:::9$
or
CODE
11$),
then scan the label with the wand. If the HP-7 SD can decode the label, it will return the scanned data as
a string, and issue a high tone. If the label did not decode properly, or if 2-1/2 minutes have gone by
with no scanning, a null string will be returned, and a low tone will be issued. If
CD I G I T
ot'~
has been
executed, labels without check digits will not decode properly.
Here is the recommended procedure for scanning a bar code label with a wand:
1) Connect the wand to the HP-7 SD, and turn the computer on.
2) Execute the keyword for the type of label you are scanning
(CODE:::'3$
for Code 39 labels or
CODE 11 $
for Code 11 labels).
3) If you are using a switched wand, depress and hold the wand switch.
4) Place the wand tip into the quiet zone (the white area preceding the bar code label), with a tilt
angle between 0 and 30 degrees normal to the surface.
5)
Scan the entire label smoothly, making sure the wand tip does not go outside the rectangular
boundary of the bar code label.
6)
If you are using a switched wand, release the switch after scanning the label to conserve battery
power.
Using Audible and Visual Prompts
Most applications will use some type of programmed prompting to signal the user when to scan the label.
The
BEEF'
command gives audible prompts, and the
D I
::;p command gives visual prompts.
The prompting done by the program and the scanning done by the user must be synchronized. The
program should not wait so long after a signal that the user scans before the decoder is ready. Here is
a
program guaranteed to frustrate anyone trying to scan labels:
56
I
1
j
j
1
1
1
1
1
1
\I
u
H
rn
at
ft
CI
CI
th
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