43967002TH Rev.1
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Oki Data CONFIDENTIAL
1. Configuration
Note!
Signal name in the parenthesis ( ) indicates the nibble mode.
Functions in the compatible mode is described only.
The nibble mode in compliance with IEEE std12_4-1994 that is
specified by IEEE is supported. If any computer or cable that do not
comply with this specification is sued, unexpected operations may
occur.
1.5.3 Parallel interface specifications
Fundamental specifications
Parallel interface in compliance with IEEEstd1284.-1994
Connector
Printer side: 36 pins receptacle (male) connector type: 57RE-40360-830B-D29
(Manufactured by Daiichi-Denshi Industry or equivalent )
Cable side: 36 pins plug (male) connector type: 57FE-30360 (Manufactured by
Daiichi-Denshi Industry or equivalent )
Cable
Use the cable in compliance with IEEE std. 1284-1994 of less than 1.8 m or equivalent
(Use the shielded cable.)
Transmission mode
Compatible/Nibble/ECP
Interface Level
Low level: +0.0 V to +0.8 V
High level: +2.4 V to +5.0 V
Connector pin arrangement
18
36
19
1
Interface signal
Pin No.
Signal name
Direction
Function
1
nStrobe (HostClk)
TO PRINTER Pulse to read data. Data is read at trailing edge.
2
9
DATA 1
DATA 8
Bi-direction
8-bit parallel data High level is “1” and low level
is “0”.
10
nAck(PtrClk)
FROM
PRINTER
Signal indicating completion of data reception
11
Busy(PtrBusy)
FROM
PRINTER
Signal indicating if a printer is ready to receive
data. Data reception is impossible while it is
high-level.
12
PError(AckDataReq) FROM
PRINTER
High-level indicates paper error.
13
Select(Xflag)
FROM
PRINTER
When the parallel interface is available, it is
always at high-level.
14
nAutoFd(HostBusy) TO PRINTER Used by the bidirectional communication
15
-
-
Not used
16
GND
-
Signal ground
17
FG
-
Chassis ground
18
+5V
FROM
PRINTER
Unable to supply power to outside device.
19 30 GND
-
Signal ground
31
nInit(nInit)
TO PRINTER Printer is initialized at low-level.
32
nFault(nDataAvail)
FROM
PRINTER
When a printer is in the alarm state, it is set to
low-level.
33
GND
-
Signal ground
34
-
-
Not used
35
HILEVEL
FROM
PRINTER
Pulled up to + 5 V with 3.3 k resistor inside a
printer.
36
nSelectIn
(IEEE1284 active)
TO PRINTER Used by the bidirectional communication It must
be at the low-level during the compatible mode.