Neoware T5730 - Compaq Thin Client User Manual page 385

TA6530 Emulation
When the emulation detects an error, the status line will be
temporarily replaced by an error line which will display one of the
following messages:
INVALID LANGUAGE SET REQUESTED
You tried to use an invalid national character set.
INVALID DATA
You tried to enter an invalid character in the current field when in
Block protect mode.
The Status Line 363