Seiko Instruments SII Black-and-White Raster Plotter LP-1020 - Manual (Page 248)

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Warning (Classification: W)
Description : A warning state such as being low on consumables, or
that a data error occurred.
Cause : A consumable is almost used up, or any failure in the
environment, settings, or data occurred.
Measure : Take appropriate measures to remove the cause.
*Log example in case of HPGL format error
“W DATA 0201”