1 

Data_Strobe_L 

Data Strobe Low 

Set low during forward channel transfers to latch data into peripheral device. Set high during reverse channel transfers. 

2 to 9 

Data[0..7] 

Data0 Through Data7 

The main data bus for the parallel port. Data0 is the least significant bit (LSB). Are not used during reverse channel transfers. 

10 

ACK_L 

Acknowledge Low 

Driven low by the peripheral device to acknowledge data byte transfer from host during forward channel transfer. Qualifies data being transferred to host in reverse channel transfer. 

11 

BUSY 

Busy 

Driven high to indicate the peripheral device is not ready to receive data during forward channel transfer. Used to send Data3 and Data7 during reverse channel transfer. 

12 

PERROR 

Parity Error 

Driven high by peripheral device to indicate an error in the paper path during forward channel transfer. Used to send Data2 and Data6 during reverse channel transfer. 

13 

SELECT_L 

Select Low 

Indicates the peripheral device is on-line during forward channel transfer. Used to send Data1 and Data5 during reverse channel transfer. 

14 

AFXN_L 

Auto Feed Low 

Set low by the host to drive the peripheral into auto-line feed mode during forward channel transfer. During reverse channel transfer, set low to indicate host can receive peripheral device data and then set high to acknowledge receipt of peripheral data. 

15 

ERROR_L 

Error Low 

Set low by the peripheral device to indicate an error during forward channel transfer. In reverse channel transfer, set low to indicate peripheral device has data ready to send to the host. Used to send Data0 and Data4. 

16 

INIT_L 

Initialize Low 

Driven low by the host to reset peripheral. 

17 

PAR_IN_L 

Peripheral Input Low 

Set low by the host to select peripheral device for forward channel transfer. Set high to indicate bus direction is from peripheral to host. 

18 

Signal ground 

Signal ground 

19 

Signal ground 

Signal ground 

20 

Signal ground 

Signal ground 

21 

Signal ground 

Signal ground 

22 

Signal ground 

Signal ground 

23 

Signal ground 

Signal ground 

24 

Signal ground 

Signal ground 

25 

Signal ground 

Signal ground