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Parallel Interface
User’s Manual C-5
INTERFACE
INFORMATION
Notes:
1. Left-aligned signal names are in compati mode and right-aligned
ones are in nibble mode.
2. The direction (input and output) refers to the printer.
3. Return line: Twisted-pair return line connected to the signal
ground level.
32 — F
ault Output This signal goes low under the following
printer conditions:
(1) Offline
(2) Paper out
(3) Cut-sheet feeder error
(4) Other printer error
D
ata Available Reverse data transfer phase:
This signal is set low when the printer is
ready to send data to the host. During
the data transfer, it is used as data bit 0
(LSB), then data bit 4.
Reverse idle phase:
This signal is used to indicate that data is
available.
33 — Signal Ground
(SG)
— Logic ground level (0 V)
34 —— — No connection
35 — +5 VR Output Pulled up to +5 V through a 3.3 kΩ
resistor
36 — SL
CT-IN Input Not used
1284 Active This signal goes high to cause the printer
to enter the reverse data transfer phase
(nibble mode).
Table C–1 Parallel interface signals (Continued)
Pin
number
Return
pin
number
Signal
Compatible mode
Nibble mode
Direction Description
DL6400/6600 Book Page 5 Thursday, September 21, 2000 7:52 PM