Pin No.

Direction

IEEE 1284-B connector

 

 

 

 

 

 

 

 

 

Compatibility

 

Nibble

 

ECP

 

 

 

 

 

 

 

31

IN

nlnit

 

 

nReverse

 

 

 

 

 

 

Request

 

 

 

 

 

 

32

OUT

nFault

 

nDataAvail

 

nPeriphRequ

 

 

 

 

 

 

est

 

 

 

 

 

 

 

33

 

 

 

GND

 

 

 

 

 

 

 

34

 

 

 

NC

 

 

 

 

 

 

 

35

OUT

 

 

+5V

 

 

 

 

 

 

36

IN

nSelectin

 

IEEE1284 Active

 

 

 

 

 

 

 

Note:

The column heading “Direction” refers to the direction of signal flow as viewed from the printer.

nstrobe/HostClk

Compatibility mode:

Latch pulse used to read in print data. When

 

low, DATA is valid.

negotiation phase:

Latch pulse used to read in print data. When

 

low, DATA is valid.

negotiation phase:

Latch pulse used to read in extensibility reguest

 

values.

Nibble mode:

Always high.

ECP mode:

Used to transfer data and addresses from the

 

host to the printer with handshaking via

 

PeriphAck (Busy).

DATA 1 to DATA 8 (bidirectional, but may always be an input if ECP or EPP mode is not supported)

Compatibility mode:

Forward channel data.

negotiation phase:

Extensibility request value.

Nibble mode:

Not used.

ECP mode:

Bi-directional data.

A-6Technical Specifications