Citizen Systems PPU-231II - Manual (Page 97)

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[Caution] • Because frequent writing in the non-volatile memory can
destroy the memory, the writing command (FS g3) should be
used less than 10 times a day.
• It may happen that the printer becomes BUSY during the
process of writing data into the non-volatile memory while
this command is executed. When the printer becomes BUSY,
it will stop receiving data. Therefore, sending data from the
host (Including real time commands) is prohibited.
[Reference] FS g4