Brother TD-2120N - Manual (Page 30)

Raster Command Reference
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4. Printing Command Details
(7) Notification number
Notification Value
Not available 00h
Cooling (started) 03h
Cooling (finished) 04h
Waiting for peeling 05h
Finished waiting for peeling
（Not used：Reserved）
06h
Printer paused 07h
Finished printer pause
（Not used：Reserved）
08h
(8) Battery level
Battery Level Value
Full 00h
Half 01h
Low 02h
Charging required 03h
AC adaptor in use 04h