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Pin
31
Host
32
Printer
33
34
35
36
Host
NOTE: The length of the data cable from the host computer to the printer should not exceed 32 feet (10
meters).
Host Clock / nWrite. Driven by host. Data transferred from host to printer. When printer sends data, two
types are available. If Nibble mode, signal is set high. If 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 the printer cannot
receive data. (Data bits 4 and 8 in Nibble mode.)
Acknowledge Data Request / nAcknowledge Reverse. Driven by the printer. Indicates the printer is in
a fault condition. (Data bits 3 and 7 in Nibble mode.)
Xflag. Driven by the printer. A high true level indicating the printer is ready for data transfer and the
printer is on line. (Data bits 2 and 6 in Nibble mode.)
Host Busy / Host Acknowledge / NDStrobe. Driven by the host. Activates auto-line feed mode.
Peripheral Logic High. Driven by the printer. When the line is high, the printer indicates all of its signals
are in a valid state. When the line is low, the printer indicates its power is off or its signals are in an invalid
state.
nReverse Request. Driven by the host. Resets the interface and forces a return to Compatibility mode
idle phase.
nData Available / nPeripheral Request. Driven by the printer. Indicates the printer has encountered an
error. (Data bits 1 and 5 in Nibble mode.)
1284 Active / nAStrobe. Driven by the host. A peripheral device is selected.
Host Logic High—Driven by the host. When set to high, the host indicates all of its signals are in a valid
state. When set to low, the host indicates its power is off or its signals are in an invalid state.
nInit —Resets init interface from the host.
Ethernet
Refer to the Integrated Network Interface User's Manual for detailed information on the ethernet interface.
Table 18 1284 Signals
Source of Data
Compatible
nInit
NFault
Not Defined
Not Defined
Not Defined
nSelectIn
Type of Mode
Nibble
Byte
nDataAvail
aDataAvail
1284 Active
1284 Active
215
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