Appendix B Host Computer Interface

[ ]: Signal names in the Auto mode and Nibble (high) mode (IEEE1284).

In the Auto mode and Nibble (high) mode, these signals are bi- directional.

Detailed descriptions of the signals follow.

Strobe* [nStrobe] (Pin 1)

A negative-going Strobe* pulse causes the printer to read and latch the data on the Data 0 [1] to Data 7 [8] signal lines.

Data 0 [1] to Data 7 [8] (Pins 2 to 9)

These eight signals form the data byte sent from the host computer to the printer. Data 7 [8] is the most significant bit.

Acknowledge* [nAck] (Pin 10)

This negative-going pulse acknowledges the previous charac- ter received by the printer.

Busy [Busy] (Pin 11)

This signal is high when the printer is busy and low when it is able to accept more data.

Paper Empty [PError] (Pin 12)

This signal goes high when the printer has received a print job and run out of paper.

Online [Select] (Pin 13)

This signal is high when the printer is online and low when the printer is offline. It goes low when the GO key is pressed to set the printer offline.

+5 V DC (Pin 18)

This line is connected to the printer’s +5 V DC line (+5 V ±0.5 V, maximum 400 mA [Serial and Parallel total], fused).

Error* [nFault] (Pin 32)

When the high-speed parallel line control is on (FRPO O2=2), this line returns error status.

Power Ready (Pin 35)

This signal is high when the printer is turned on.

NOTE

The Paper Empty, Online, and Error signals are not used un- less enabled by the FRPO command (O2 parameter).

2. USB Interface

This printer supports the Hi-Speed USB 2.0. USB (Universal Serial Bus) interface specifications and interface signals are as follows.

2.1 Specifications

Basic specification

Complies with the Hi-Speed USB 2.0.

Connectors

Printer: B-type receptacle (female) with upstream port

Cable: B-type plug (male)

Cable

Use a shielded cable that complies with USB 2.0 and not long- er than 5 meters (16 feet).

Transfer Mode

Full speed (max. 480 Mbps)

Power Control

Self-power device

2.2 Interface Signals

USB Connector Pin Assignment

Pin

Signal

Description

 

 

 

1

Vbus

Power supply (+5 V)

 

 

 

2

D-

Data transmission

 

 

 

3

D+

Data transmission

 

 

 

4

GND

Signal ground

 

 

 

Shell

 

Shield

Table B-2

B-2

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HP WP36/50 manual USB Interface, Specifications

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