^WV - Configure RFID Write Verify
Turns on or off the read-back check the printer performs after encoding a tag.
Some tag manufacturers pre-program their transponders with known test data. ^WV
makes the printer check for it — hex A5A5 in the first two bytes — before it
encodes. It catches a tag already written or an unexpected tag. It is off by
default.
Syntax
^WVeSupport
Accepted and skipped, because it configures the printer rather than the label. It cannot change the rendered output, and Labelary skips it too.
Decides whether the printer reads a tag back after it writes. Neither the write nor the read-back happens here. The renderer does not parse this command. It reports IGNORED_COMMAND at info severity, which does not reach X-Warnings. Labelary is also silent, so the rendered label is identical in both engines and with or without the command. — not pinned by a test
Labelary renders this command.
Parameters
eEnable write verifyoptional · Y or NWhether the printer checks, before it encodes, that the tag holds hex A5A5 in its first two bytes, the test data some manufacturers pre-program. The guide notes the setting is not persistent from label to label.
- Default
- N
- Invalid value
- not documented, and we have not measured it. The renderer does not parse this command or validate its arguments. The guide does not state what a printer does with an out-of-range value.
- Test coverage
- No documented value is exercised by a test (Y, N).
Y- Verify before writing.
N- Do not verify. (default)
Behavior
The setting is not persistent. It applies to the format that carries it and resets
for the next one, so a batch needs it in every format. ^WT parameter v
performs the same check for a single write.
The check happens inside the transponder exchange and never appears on the label.
Example
Turning write verify on above a single line of text:
^XA
^WVY
^FO50,50^A0N,30,30^FDwrite verify on^FS
^XZ
Related commands
^WTWrite RFID TagEncodes data onto a tag.^RFRead or Write RFID FormatReads a tag, encodes a tag, or declares the access password used by later lock commands.^RSSet Up RFID ParametersSets the tag type, the programming position and what the printer does when encoding fails.