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B–13
Host I/O Interfaces
Type of Mode
Pin ByteNibbleCompatibleSource of Data
26 Printer Signal Ground (Data 7)
27 Printer Signal Ground (Data 8)
28 Printer Signal Ground (PError, Select, nAck)
29 Printer Signal Ground (Busy, nFault)
30 Printer Signal Ground (nAuto, nSelectIn, nInit)
31 Printer nInit
32 Printer NFault nDataAvail aDataAvail
33 Printer Not Defined
34 Printer Not Defined
35 Printer Not Defined
36 Printer nSelectIN 1284 Active 1284 Active
NOTE: The length of the data cable from the host computer to the printer
should not exceed 10 meters (32 feet).
Host Clock / nWrite. Driven by host. Data transferred from host to printer. When
printer sends data, two types are available: in Nibble Mode (signal is set high) or
in Byte Mode (signal is set low).
Data 1 through Data 8. These pins are host-driven in Compatibility Mode and
bidirectional in Byte Mode. They are not used in Nibble Mode. Data 1 is the least
significant bit; Data 8 is the most significant bit.
Printer Clock / Peripheral Clock / Interrup. Driven by the printer. A signal from
the printer indicating the character or function code has been received and the
printer is ready for the next data transfer.
Printer Busy / Peripheral Acknowledge / nWait. Driven by the printer. Indicates
that the printer cannot receive data. (Data bits 4 and 8 in the Nibble Mode.)
Acknowledge Data Request / nAcknowledge / nWait. Driven by the printer.
Indicates that the printer is in a fault condition. (Data bits 3 and 7 in Nibble
Mode.)