Ampro Corporation P5X ユーザーズマニュアル
2–26
Table 2–22. Parallel Port Connections (J15)
J15
Pin
Signal
Name
Function
In/Out
DB25
Pin
1
STB*
Output Data Strobe
Out
1
3
PD 0
LSB Of Printer Data
I/O
2
5
PD 1
Printer Data 1
I/O
3
7
PD 2
Printer Data 2
I/O
4
9
PD 3
Printer Data 3
I/O
5
11
PD 4
Printer Data 4
I/O
6
13
PD 5
Printer Data 5
I/O
7
15
PD 6
Printer Data 6
I/O
8
17
PD 7
MSB Of Printer Data
I/O
9
19
ACK*
Character Accepted
In
10
21
BUSY
Cannot Receive Data
In
11
23
PE
Out of Paper
In
12
25
SLCT
Printer Selected
In
13
2
AUTOFD*
Autofeed
Out
14
4
ERROR
Printer Error
In
15
6
INIT*
Initialize Printer
Out
16
8
SELIN*
Selects Printer
Out
17
26
KEY
Key Pin
N/A
Note
For maximum reliability, keep the cable between the board and the
device it drives to 10 feet or less in length.
device it drives to 10 feet or less in length.
IEEE-1284-compliant Cables
Using the parallel port for high-speed data transfer in ECP/EPP modes requires special cabling for
maximum reliability.
maximum reliability.
Some of the parameters for a compliant IEEE-1284 cable assembly include:
•
All signals are twisted pair with a signal and ground return
•
Each signal and ground return should have a characteristic unbalanced impedance of 62 +/- 6
ohms within a frequency band of 4 to 16 MHz
ohms within a frequency band of 4 to 16 MHz
•
The wire-to-wire crosstalk should be no greater than 10%