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3. Interface specifications
3.1 Parallel interface (Centronics compliant)
1) Data input
2) Control signals
3) Input signal to a printer
DATA 0 – 7
/STB
/LF
4) Output signal from a printer
/ACK
BUSY
/ERROR
PE
SLCT
5) Input/Output signal level
Input low level
Input high level
Output low level*
Output high level
*I
OL
6) Input/Output Circuits conditions
74LV574
74LV32
D-F0390 NP-326 Product specifications Ver.0.02
: 8 bit parallel method(DATA 0 – DATA 7)
: /ACK, BUSY, /STB, /ERROR, PE, SLECT
: 8 bit parallel signal(positive logic)
: Signal to read 8 bit data(negative logic)
: Signal to feed paper to print mechanism(negative logic)
: Enquiry signal for 8 bit data. It's also pulse signal which is output after
BUSY signals (negative logic)
: Indicate BUSY status of the printer. Inputs new data at LOW status
(positive logic)
: This signal becomes LOW when a printer is in the alarm status.
In the LOW status, all control circuits in the printer stops (negative logic)
: Outputs when roll paper becomes empty (positive logic)
: Signal to indicate on-line status (positive logic)
Code
V
4mA
VCC
100
STROB
74LV14
IN PUT
VCC
3.3k
PD0~PD7
IN PUT
510
INIT IN
1SS319
IN PUT
47
ACK, P E, SLCT, ERROR
74LV14
OUT PUT
47
BUSY
OUT PUT
Standard value
Min.
TYP.
V
-
IL
V
3.25
IH
V
-
OL
3.25
OH
10
Unit
Max.
-
0. 8
V
-
5.25
V
-
0.7
V
-
-
V
VCC
10K
○ LF
IN PUT
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