Brother TD-2120N - Manual (Page 38)

Raster Command Reference
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5. Flow Charts
5. Flow Charts
Normally, printing is performed as buffered printing.
However, if the printer is connected via USB and uncompressed data is received, concurrent printing is
performed.
Note:
Concurrent printing：Printing starts immediately after the printer receives print data.
Buffered printing：Printing starts after one page of print data is received.