Interface Specifications
Parallel Interface
Data format:
8-bit parallel, IEEE P1284 compatible mode
Synchronization:
STROBE pulse
Handshake timing:
BUSY and ACKNLG signals
Signal level:
TTL compatible
Connector:
36-pin, Centronics compatible connector
Pin assignments
Signal
Pin
Return
Pin
Signal
Direction
Description
1
19
STROBE
IN
STROBE
pulse to read data.
2
3
4
5
6
7
8
9
20
21
22
23
24
25
26
27
DATA 0
DATA 1
DATA 2
DATA 3
DATA 4
DATA 5
DATA 6
DATA 7
IN
IN
IN
IN
IN
IN
IN
IN
These signals represent
information in bits 0 to 7 of
parallel data respectively.
Each signal is at HIGH level
when data is logical 1 and
LOW when it is logical 0.
10
28
ACKNLG
OUT
About a 5-
µ
s pulse. LOW
indicates data has been
received and the printer is
ready to accept more data.
11
29
BUSY
OUT
A HIGH signal indicates the
printer cannot receive data.
The signal goes HIGH in the
following cases:
1) During data entry
(for each character)
2) During initialization
3) During self test,
demonstration, and
default-setting printing
4) During a printer-error state
Technical Specifications
A-9
