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Handshake timing
When the vacant area for data in the input buffer drops to
256 bytes, the printer outputs an X-OFF code or sets the DTR
flag to 1 (MARK) to indicate that it cannot receive data. When
the vacant area for data in the buffer increases to 512 bytes, the
printer outputs an X-ON code or sets the DTR flag to 0
(SPACE) to indicate that it is ready to receive data.
Error handling
When the printer detects a parity error, it prints an asterisk (*).
The printer ignores all other errors, including framing and
overrun errors.
Using Optional Interfaces
7-5