Service manual

BUSY (out)
Compatible mode: HIGH status indicates the printer is not ready to accept data.
Negotiation phase: Reflects busy status in forward channel.
Reverse data transfer
phase:
Nibble data bit is 3, then 7 in nibble mode.
Reverse idle phase: Reflects busy status in forward channel.
ECP mode: Used for flow control in forward channel.
Also used in reverse mode as the 9th data bit, which indicates
whether signal data information is data or command.
PE (out)
Compatible mode: Indicates paper jam or paper empty status in paper tray or cassette.
ERRX goes LOW when PE goes HIGH.
Negotiation phase: HIGH status indicates whether or not IEEE is supported.
Then, it follows nDataAvail (nFault).
Reverse data transfer
phase:
Nibble data bit is 2, then 6 in Nibble mode.
Reverse idle phase: Remains HIGH until the host computer requests data transmission.
Then, it follows nDataAvail (nFault).
ECP mode: Aknowledges nReverseRequest when this signal is set to LOW.
The host computer detects the status as an allowance to drive signal
data.
Slctout (out)
Compatibility mode: Always HIGH
Negotiation phase: Xflag indicates Extensibility flag. It is used in response to
extensibility request value from the host computer.
Reverse data transfer
phase:
Nibble data bit is 1, then 5 in nibble mode.
Reverse idle phase: Same as negotiation phase.
ECP mode: Same as negotiation phase.
AutoX (in)
Compatible mode: Not used.
Negotiation phase: This signal goes HIGH and IEEE 1284 active (nSelectIN) goes LOW
when requesting IEEE 1284 mode. Then it is set to HIGH by setting
PtrClk (nAck) to LOW.
Reverse data transfer
phase:
The host computer informs the printer that it is ready to receive data
in nibble mode by setting this signal to LOW. Then sets the signal to
HIGH to inform the printer that data has been received.
Reverse idle phase: This signal goes HIGH in response to a LOW pulse of PtrClk (nAck)
to enter reverse data phase again. Reverse idle phase is returned to
compatibility mode if this signal goes HIGH and IEEE 1284 active
(nselectIn) goes LOW at the same time.
ECP mode: Used for flow control of forward channel. Also used in reverse
mode as the 9th data bit, which indicates whether signal data
information is valid data or command.
Product Description EPL-N2000 Service Manual
1-20 Rev. A