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ENQ/STX protocol In addition to this XON/XOFF message, the possibility exists of re-
questing a status byte from the printer using the ENQ code (hex. 05,
dec. 5).
The STX code (hex 02, dec. 2) is used to clear any error messages
(parity error, buffer overflow).
Status byte Bit 0 – 1
Bit 1 – 1
Bit 2 – 0
Bit 3 – 1
Bit 4 – 1
Bit 5 – 1
Bit 6 – 1
Bit 7 – 0
BUSY
Off Line
Paper end
Always 1
Cover open
Buffer overflow
Parity or frame error
Always 0
STX (hex02) Clears any previous parity or framing error as well as
any buffer overflow error.
ENQ (hex05) The current printer status is sent to the host.
XON/XOFF This protocol is automatically used for data flow control
and printer status handling.
HandThr.=ON The STX and ENQ characters are not filtered out of the
data stream and control the interface in addition.
HandThr.=OFF The STX and ENQ are filtered out of the data stream
and handled immediately by the interface.
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Reference manual Interfaces
165