Parallel Interface Specifications - Oki MC860 Maintenance Manual

Oki Data CONFIDENTIAL

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
43967002TH Rev.1
1
19
Interface signal
Pin No. Signal name Direction
1 nStrobe (HostClk) TO PRINTER Pulse to read data. Data is read at trailing edge.
2 DATA 1 Bi-direction
9 DATA 8
10 nAck(PtrClk) FROM
PRINTER
11 Busy(PtrBusy) FROM
PRINTER
12 PError(AckDataReq) FROM
PRINTER
13 Select(Xflag) FROM
PRINTER
14 nAutoFd(HostBusy) TO PRINTER Used by the bidirectional communication
15 - -
16 GND -
17 FG -
18 +5V FROM
PRINTER
19 30 GND -
31 nInit(nInit) TO PRINTER Printer is initialized at low-level.
32 nFault(nDataAvail) FROM
PRINTER
33 GND -
34 - -
35 HILEVEL FROM
PRINTER
36 nSelectIn TO PRINTER Used by the bidirectional communication It must
(IEEE1284 active)
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. Configuration
Function
8-bit parallel data High level is "1" and low level
is "0".
Signal indicating completion of data reception
Signal indicating if a printer is ready to receive
data. Data reception is impossible while it is
high-level.
High-level indicates paper error.
When the parallel interface is available, it is
always at high-level.
Not used
Signal ground
Chassis ground
Unable to supply power to outside device.
Signal ground
When a printer is in the alarm state, it is set to
low-level.
Signal ground
Not used
Pulled up to + 5 V with 3.3 k resistor inside a
printer.
be at the low-level during the compatible mode.
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