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7.2 Parallel Interface
Connector Pin Assignment
Item
Specification
Method
Centronics
Data transfer rate
1000 to 6000 cps
Synchronization method
External supply strobe pulse
Handshaking
By ACK and BUSY signals
Logic level
TTL-compatible
Pin No.
Signal Name
IN/OUT
Function
1
STROBE
IN
Normally HIGH. Data reading starts after this signal
becomes LOW.
2 ~ 9
DATA 1 ~ 8
IN
Data. HIGH for “1”, LOW for “0”.
10
ACK
OUT
Turned ON when data acquisition is complete.
11
BUSY
OUT
Reception of data is possible when this signal is LOW;
reception is not possible when HIGH.
12
PAPER OUT
OUT
Becomes HIGH when no paper is inserted.
13
SELECTED
OUT
Becomes HIGH when the printer goes on line.
14 ~ 15
N/C
Not used
16
SIGNAL GND
Signal ground
17
CHASSIS GND
Printer frame ground
18
+5 V
+5 V for external equipment (50 mA max.)
19 ~ 30
TWISTED
PAIR RETURN
Return signal for various signals
31
RESET
IN
Initializes the printer when LOW.
32
ERROR
OUT
Becomes LOW when the printer cannot function.
33
EXT GND
Ground terminal for external equipment
34 ~ 35
N/C
Not used
36
—
Always HIGH
Summary of Contents for TUP452-24
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