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User's ManualD-4
INTERFACE INFORMATION
Nibble Mode
Pin numbers 2 to 9, 15 to 31, and 33 to 35 are the same as the conven-
tional mode.
Pin Return Signal Direc- Description
No. Pin No. name tion
1 19 Host Clock Input This signal is set high when
the host requests the reverse
data transfer phase (nibble
mode).
10 28 Printer Clock Output Reverse data transfer phase:
This signal goes high when
data being sent to the host is
established.
Reverse idle phase:
This signal is set low then
goes high to interrupt the
host, indicating that data is
available.
11 29 Printer Busy Output Reverse data transfer phase:
Data bit 3, data bit 7, then
forward path (host to printer)
busy status
12 30 Ack Data Req Output Reverse data transfer phase:
Data bit 2, then data bit 6
Reverse idle phase:
This signal is set high until the
host requests data and, after
that, follows the
Data Available
signal.
13 – X Flag Output Reverse data transfer phase:
Data bit 1, then data bit 5
#D Appendix D 2000.09.20, 2:47 PM4