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Scan Error Conditions
Most scan errors are caused by slow or uneven scanning, inaccurate scans, i.e., missing some of the bars in a row, excessively tilting
the wand, or by defective bar code. When the wand detects a scan error condition, the HP-41C sounds the prolonged scan error tone,
and, in most cases, displays an error message. Bar coded information from the row causing the scan error is rejected, and no
information transfer or function execution takes place.* To hear the difference between the normal scan tone and the scan error tone,
scan the following rows of paper keyboard bar code. Scanning the row of good bar code gives you the normal scan tone and causes
the indicated function to be executed. Scanning the meaningless bar code consistently produces the scan error tone. Scanning the
defective paper keyboard (or label) bar code can result in no response, a scan error indication, or, in some cases, the wrong function.
Good Bar Code
(Disables automatic turn-off.)
ON
You can reduce errors to a minimum by developing a good scanning technique and by protecting your bar code. When you experience
scan errors that are not due to defective bar code, you can normally recover by simply rescanning the rejected row. But if the error
condition persists, ou may want to execute the
and the bar code is not worn of poorly printed, refer to
Direct sunlight overloads the wand's light sensor sufficiently to hinder or prevent the wand from reading bar code. For this reason, if
you operate the wand in direct sunlight, shield the bar code you are scanning.
Error Messages
W: ADDR ERR
W: CHKSUM ERR
*
Most bar code types use a checksum to detect errors, e.g., the checksum in program bar code causes an error message if the bar pattern is misread.
However, with the short rows and similar patterns in paper keyboard and label bar code, it is possible that a row code as one function can be misread
and accepted as another function. In most cases this condition is due to defective bar code or use of improper scan techniques.
Errors and Messages
WNDTST
Address error. An attempt was made to store data in a nonexistent data storage register.
Recovery: You may want to use
existing storage register. If you interrupt a
reexecute the entire operation.
bbb.eee,
Checksum error. The system has detected a scan error or program barcode sequence error.
Recovery: Paper keyboard or date barcode. Re-scan the row where the error condition occurred. If
repeated scan errors occur, the barcode may be defective. Enter the function or data from the keyboard. If
data entry was under
WNDDTA
1. Press the
key to terminate the
2. Enter from the keyboard all remaining data in that series to avoid any storage errors.
3. If the error occurs in a running program, execute
Recovery: Program barcode.
1. Check the display prompts to be sure you scanned the proper row. Scan the row indicated by the
prompt.
HP 82153A - Wand Owner Manual - page 19
Appendix A
Meaningless Bar Code
function (refer to
page
appendix
B, Maintenance and Service.
to create more storage register space or store the data in another,
SIZE
WNDDTX
of
control, do the following:
WNDDTX
or
WNDDTA
WNDDTX
Defective Bar Code
(Disables automatic turn-off.)
ON
16,
). If
WNDTST
WNDTST
operation to create more storage registers of change
function.
to resume program execution.
R/S
indicates wand read failures
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