Parallel interfacing, Specifications, Paper specifications – Panasonic KX-P3124 User Manual
Page 101
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Parallel Interfacing
A method of transferring data from a computer to a printer through a parallel interface based on the
Centronics Standard.
Specifications:
•data transfer speed: 1000 cps minimum
•synchronization: external STROBE pulse
• logic levels: TTL
___
•handshaking: BUSY and ACK signals
•connector type: 57-30360 (AMPHENOL) or equivalent
•cable: use a shielded cable (6'5" /1.95 meters) or less in length.
When the printer is processing data, the BUSY signal is high. The printer will not accept new data
from the computer. After the processing is completed, the BUSY signal goes low. (The BUSY signal
is also high when the printer is OFF LINE). When the busy signal occurs, the ACK signal goes low
indicating to the computer that the data has been processed and the printer is ready to accept more
data. This handshaking routine occurs each time a character is sent to the printer.
BUSY
SLCT
PO
ERROR
ON LINE
LOW
HIGH
LOW
HIGH
OFF LINE
HIGH
LOW
LOW
LOW
PAPER OUT
HIGH
LOW
HIGH
LOW
Printer Status signals
Signal
pin
Return
side pin
Signal
Direc
tion
1
19
STB
Input
2
20
DATA 1
3
21
DATA 2
4
22
DATA3
5
23
DATA 4
6
24
DATAS
7
25
DATA 6
8
26
DATA 7
9
27
DATA 8
10
28
ACK
Output
11
29
BUSY
12
PO
Pin Configuration (Parallel)
Signal
pin
Return
side pin
Signal
Direc
tion
13
SLCT
Output
14
AUTO FEED XT
Input
15
16
SG
17
FG
18
-b5V
Output
31
30
PRIME
Input
32
ERROR
Output
33
SG
34
35
36
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