Fujitsu DL6400Pro User Manual page 179

Parallel Interface
Pin Return
number pin
number
14 —
15 —
16 —
17 —
18 —
19–30 —
31 —
C-4
Table C–1 Parallel interface signals (Continued)
Signal Direction
Compatible mode
Nibble mode
Auto Feed XT Input
Host Busy
—
Signal Ground
(SG)
Frame Ground
(FG)
+5V Output
Signal Ground
(SG)
Input Prime Input
(INPRM)
Description
Not used
Reverse data transfer phase:
This signal is set low when the host can
receive data, and goes high when the
host has received data. Following a
reverse data transfer, the interface enters
the reverse idle phase when the Host
Busy signal goes low and the printer has
no data.
Reverse idle phase:
This signal goes high when the Printer
Clock signal goes low so that the
interface re-enters the reverse data
transfer phase. If it goes high with the
1284 Active signal low, the idle phase is
aborted and the interface returns to the
compatibility mode.
— No connection
— Logic ground level (0 V)
— Printer chassis ground line. FG and SG
are connected.
+5V source (up to 300 mA)
— Twisted-pair return lines
If this signal is low for more than 50 µs,
the printer is reset to initial status and
placed online.
User's Manual