Panasonic KX-P3123 User Manual Page 94

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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
oooooooooooooooooo
oooooooooooooooooo
l36 19.
Parallel interface connector (printer side)
Signal
pin
Return
side
pin
Signal
Direc
tion
1
19
STB
Input
2
20
DATAI
3
21 DATA 2
4
22
DATA3
5
23
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
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