Interface Specifications; Parallel Interface (Centronics) - Star Micronics NP-215 Specifications

3. Interface specifications

3.1 Parallel interface (Centronics)

1) Data input
2) Control signals
3) Input signal to a printer
DATA 0 – 7
/STB
/INIT
/LF
4) Output signal from a printer
/ACK
BUSY
/ERROR
In the LOW status, all control circuits in the printer stops (negative logic)
PE
SLCT
5) Input/Output signal level
Input low level
Input high level
Output low level
Output high level
*I
OL
6) Input/Output conditions
: 8 bit parallel method(DATA 0 – DATA 7)
: /ACK, BUSY, /STB, /ERROR, PE, SLCT, /INIT
: 8 bit parallel signal(positive logic)
: Signal to read 8 bit data(negative logic)
: Signal to reset an entire printer(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.
: Outputs when roll paper becomes empty (positive logic)
: Signal to indicate on-line status (positive logic)
Code
V
V
V
V
4mA
VCC
100
74LV14
VCC
74LV574
3.3k
510
1SS319
47
74LV14
47
74LV32
Standard value
Min. TYP.
- -
IL
0.7Vcc -
IH
- -
OL
0.7Vcc -
OH
STROB
IN PUT
PD0~PD7
IN PUT
INIT IN
IN PUT
ACK, P E, SLCT, ERROR
OUT PUT
BUSY
OUT PUT
10
Unit
Max.
0.18Vcc V
- V
0.7Vcc V
- V
VCC
10K
○ LF
IN PUT