Oki Data CONFIDENTIAL
44043511TH Rev.2
19 /
1.5.3.5 Parallel Interface Signal
The name of the interface signal and pin number is indicated in Table 1-1.
Table 1-1 Signals
Note! Nibble mode signal names are indicated in the ( ).
Only indicates the Compatible Mode functions.
This printer supports the IEEE 1284-1994 Nibble Mode standardized by the Institute of
Electric and Electronic Engineers (IEEE). Note that use of PCs and cables that do not
comply with this standard may result in unforeseeable operations.
Pin No. Signal Name Direction Function
1 nStrobe
(HostClk)
TO PRINTER Pulse to read data.
Data is read with the latter wire.
2 DATA 1 TO PRINTER 8bit parallel data.
High Level: "1"
Low Level: "0"
3 DATA 2
4 DATA 3
5 DATA 4
6 DATA 5
7 DATA 6
8 DATA 7
9 DATA 8
10 nAck (PtrClk) FROM PRINTER Signal indicating completion of incoming data.
11 Busy (PtrBusy) FROM PRINTER Indicates whether the printer state can accept
data or not.Data cannot be accepted during High
Level.
12 PError (AckDataReq) FROM PRINTER Paper error takes place during High Level.
13 Select (Xflag) FROM PRINTER Always High Level when the parallel interface is
active.
14 nAutoFd (HostBusy) TO PRINTER Used for two-way communications.
15 Unused – Unconnected
16 GND – Ground for signal.
17 FG – Ground for chassis.
18 +5V FROM PRINTER
Provides +5V. Cannot supply power to an
external device.
19 to
30
GND – Ground for signal.
31 nInit (nInit) TO PRINTER Printer is initialized during Low Level.
32 nFault (nDataAvail) FROM PRINTER
When printer is alarming the printer goes to Low
Level state.
33 GND – The ground for signals
34 Unused – Un-connecting.
35 HILEVEL FROM PRINTER 3.3kW inside printer is pulled up by +5V.
36 nSelectIn
(IEEE1284 active)
TO PRINTER Used for two-way communications. Always in
Low Level in the compatible mode.
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