Roland DXY-1100, Справочник по командам

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How the hardwire handshake changes the remaining buffer capacity is shown in Fig. 5-7.
Remaining buffer capacity
(1)If data is transmitted to the DXY-1000 series with the DTR pin “ High" when a full buf­
fer capacity (empty now) is available, the remaining buffer capacity gradually
decreases because the data transmission speed is faster than the drawing speed.
(2) lf the remaining buffer capacity is less than the block size (80 bytes are the default
value) as determined by the 1st parameter of the ESC.H or ESC.I command, the
DXY-1000 series sets the DTF pin to “ Low". The remaining buffer capacity in­
creases gradually because of no data transmission from the computer.
(3)lf the remaining buffer capacity is larger than 512 bytes, the DXY-1000 series sets
the DTR pin to “ High". The computer then transmits the data again.
Fig. 5-7
The default after the power is turned ON means you are ready to use this hardwire hand
shake.
No matter what kind of handshake you set other than above, the DXY-1000 series switches
the DTR pin from “ High” to “ Low” and vice versa according to the remaining buffer capaci
ty. If this is inconvenient, you can fix the DTR pin at “ High" with the 1st parameter of the
ESC.@ command.
5-9