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17
Buffer full cancellation in DTR mode (the following is an example in the
Combination mode).
A) Buffer set to “big size” (4K-bytes) (set with dip switch 2-3)
When available space drops below 256 bytes, DTR is set to “MARK.” When
data in the buffer drops below 256 bytes, DTR is set to “SPACE.”
B) Buffer set to “small size” (45-bytes) (set with dip switch 2-3)
When available space drops below 16 bytes, DTR is set to “MARK.” When data
in the buffer drops below 16 bytes, DTR is set to “SPACE.”
Data buffer
Full
Near Full
Near Empty Empty
DTR “MARK” DTR “SPACE”
Remainder
256 bytes
256 bytes
Data buffer
Full
Near Full
Near Empty Empty
DTR “MARK” DTR “SPACE”
Remainder
16 bytes
16 bytes