Interfacing, Parallel interfacing, Specifications – Panasonic KX-P2023 User Manual
Page 63
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Interfacing
Parallel Interfacing
Communication with a computer is accomplished 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 ACK 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 UNE
HIGH
LOW
LOW
LOW
PAPER OUT
HIGH
LOW
HIGH
LOW
Printer Status signals
18 1
oooooooooooooooooo
oooooooooooooooooo
i36
Parallel Interface Connector (Printer side)
Signal
pin
Return
aide
pin
Signal
Direc
tion
1
19
STB
2
20
DATAI
3
21
DATA 2
4
22
DATA3
Input
5
23
DATA 4
6
24
DATA 5
7
25
DATA 6
8
26
DATA 7
9
27
DATA 8
10
28
ACK
11
29
BUSY
Output
12
PO
Pin Configuration (Parallel)
SIngal
pin
Return
aide
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
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