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(2) DTR protocol
The DTR signal (pin 20) is set off (low). That is, the Busy signal is issued when 255
(*1)
bytes of data remain
in the buffer. When the printer is placed offline, the DTR signal becomes inactive.
*1 This value is 63 bytes when the print buffer is configured for 256 BYTE in setup mode.
The computer must stop transmission within 255 bytes after the DTR signal is set off (low).
Valid data cannot be guaranteed if data exceeding the buffer capacity is transmitted without regard to the
DTR signal.
Buffer-full recovery timing:
Data transmission is suspended when the DTR signal is set off (low). Even in this state, printing continues.
When the data length of the available area in the buffer exceeds 255 bytes, the DTR signal is on (high). That
is, a “ready” signal is issued.
(3) RC protocol
The RC protocol is the same as the DTR protocol, except that it uses the Reverse Channel signal (pin 11)
instead of the Data Terminal Ready signal (pin 20).