44205401TH Rev.1
16 /
Oki Data CONFIDENTIAL
1. Configuration
1.5.4 Specification of parallel interface
1.5.4.1 General of parallel interface
Spec.
IEEE1284-1994 conforming parallel interface
Item Content
Related mode Compatible mode, nibble mode, and ECP mode
Data bit length Compatible: 8, nibble: 4, ECP: 9bit
1.5.4.2 Connector and cable of parallel interface
(1) Connector
Printer side : 36-Pole connector (Female)
57LE-40360-12(D56) (made by DDK) equivalent goods
Cable side : 36-Pole connector (male)
57FE-30360-20N(D8) (made by DDK) equivalent goods
Pin layout seen from interface cable side
(2) Cable
IEEE1284-1994 cable of less than 1.8m is used.
(
For avoiding noise interference, please use shielded cable with the twisted-pair wire.)
1.5.4.3 Parallel interface level
Low level 0.0V~+0.8V
High level +2.4V~+5.0V
1.5.4.4 Signal of interface
Pin NO.
Name of signal Direction Function
1 nStrobe (HostClk) TO PRINTER It is a pulse to read data. Data is read by
posterior end.
2~9 DATA 1~DATA 8 Bi-direction It is parallel data of 8 bits. The high level is
“1", and the Low level is “0".
10 nAck(PtrClk) FROM
PRINTER
It is a signal that shows the data reception
completion.
11 Busy(PtrBusy) FROM
PRINTER
It is a signal that shows if the printer is
receiving the data. Data cannot be received
when it is at the high level.
12 PError
(AckDataReq)
FROM
PRINTER
The paper error is shown when it is at the
high level.
13 Select(Xflag) FROM
PRINTER
When parallel interface is effective, it is
always in high-level state.
14 nAutoFd(HostBusy) TO PRINTER It is used by the bidirectional communication.
15 - - Not use
16 GND - Signal ground
17 FG - Chassis ground
18 +5V FROM
PRINTER
It cannot supply power outside.
19~30 GND - Signal ground
31 nInit(nInit) TO PRINTER The printer is initialized with the low level.
32 nFault(nDataAvail) FROM
PRINTER
When the printer is in alarm state, it
becomes low level.
33 GND - Signal ground
34 - - Not use
35 HILEVEL FROM
PRINTER
It is pulled up to +5V at 3.3K
in the printer.
36 nSelectIn
(IEEE1284 active)
TO PRINTER It is used by bidirectional communication. It
must be low level when it is in compatible
mode.
Notes!
• The signal name sho
wed in the bracket is a signal name in nibble mode.
• It only describes the function in compatible mode.
• The nibble mode of IEEEstd1284-1994 regulated by Institute of Electrical
and Electronics Engineers is supported. Using the computer and the
cable unsupported this standard may lead to unexpected operation.
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