Specifications

Little Board P6d Module
2-21
Table 2-20. Parallel Port Connections (J9)
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.
IEEE-1284-compliant Cables
Using the parallel port for high-speed data transfer in ECP/EPP modes requires special cabling for
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 16MHz
The wire-to-wire crosstalk should be no greater than 10%
Please refer to the IEEE-1284 standard for the complete list of requirements for a compliant cable
assembly, including recommended connectors