Ampro Corporation P5X manual J15 Signal DB25 Pin Name Function In/Out, IEEE-1284-compliant Cables

Table 2–22. Parallel Port Connections (J15)

J15	Signal			DB25
Pin	Name	Function	In/Out	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 16 MHz

•The wire-to-wire crosstalk should be no greater than 10%

2–26