Interfacing, Parallel interfacing, Specifications – Panasonic KX-P3123 User Manual
Page 94
Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".
Interfacing
Parallel Interfacing
A method of transfering 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 (Transistor-Transistor-Logic) levels
• handshaking: BUSY and AC К signals
• connector type: 57-30360 (AMPHENOL) or equivalent
• cable: use a shielded cable (6^571.95 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
SLOT
PO
ERROR
ON LINE
LOW
HIGH •
LOW
HIGH
OFF LINE
HIGH
LOW
LOW
LOW
PAPER OUT
HIGH
LOW
HIGH
LOW
Printer status signals
18
1
o o o o o o o o o o o o o o o o o o
o o o o o o o o o o o o o o o o o o
l
36
19.
Parallel interface connector (printer side)
Signal
pin
Return
side
pin
Signal
Direc
tion
1
19
STB
Input
2
20
D A T A I
3
2 1
DATA 2
4
22
D A T A 3
5
2 3
DATA 4
6
24
DATA 5
7
25
DATA 6
8
26
DATA 7
9
27
DATA 8
10
28
ACK
Output
11
29
BUSY
12
PO
Pin configuration (Parallel)
Singal
pin
Return
side
pin
Signal
Direc
tion
13
SLOT
Output
14
AUTO FEED XT
Input
15
16
SG
17
FG
18
+5 V
Output
31
30
PRIME
Input
32
ERROR
Output
33
SG
34
35
36
94