Epson EPL-N2010 Reference Manual page 151

PError/AckDataReq/nAckReverse
Compatibility mode:
negotiation phase:
reverse data transfer phase: In nibble mode, this signal serves as nibble data
reverse idle phase:
ECP mode:
Select/Xflag
Compatibility mode:
negotiation phase:
reverse data transfer phase: In nibble mode, this signal serves as nibble data
reverse idle phase:
ECP mode:
A-8
Technical Specifications
High signal indicates that a feed jam occurred
in the paper supply section, or that there is no
paper in the paper tray.
High signal indicates whether or not IEEE 1284
is supported or not. Afterwards, this signal
conforms with nDataAvail (nFault).
bit 2 and then 6.
High until the host requests a data transfer.
Afterwards, this signal conforms with
nDataAvail (nFault).
Low signal authorizes nReverseRequest. The
host looks at this signal in order to determine
whether or not it has permission to drive the
data signals.
Always high.
Xflag indicates the extensibility flag. Used to
respond to the extensibility request value sent
from the host.
bit 1 and then 5.
Same as negotiation phase.
Same as negotiation phase.