Appendix B Host Computer Interface

This appendix explains the signals used in the printer’s paral- lel, USB, and serial (option) interfaces. It also lists pin assign- ments, signal functions, timings, connector specifications, and voltage levels. For details on the network interface, refer to the IB-21E/IB-22 User’s Manual contained on the CD-ROM that is supplied with the printer.

This appendix explains the following topics:

•Parallel Interface

•USB Interface

•Serial Interface (option)

1. Parallel Interface

1.1Parallel Interface Communication Modes

The printer features fast data transmission with the parallel interface. The parallel interface mode can be activated from the operator panel.

See Changing Parallel Interface Modes on page 3-19.

NOTE

Use a parallel printer cable that complies with the IEEE1284 standard.

Nibble (high) [default]

High speed data communication is used in compliance with the IEEE1284 standard. Ordinarily, you should leave this setting unchanged.

Auto

The printer automatically changes its communication mode to the one the host computer is currently using.

Normal

The printer uses the standard communication method pre- scribed for Centronics interfaces.

High-speed

This mode enables faster data transmission between the print- er and the host computer. (Select this mode if printing prob- lems occur when the printer is connected to a workstation.)

1.2 Interface Signals

The pins of the parallel interface connector carry the signals listed in the table in Parallel Connector Pin Assignment. As-

terisks in the table indicate signals that are low active. The table also indicates whether each signal is incoming or outgo- ing with respect to the printer.

Parallel Connector Pin Assignment

Pin

In/out

Description

1

In

Strobe* [nStrobe]

2

In/Out

Data 0 [Data 1]

3

In/Out

Data 1 [Data 2]

4

In/Out

Data 2 [Data 3]

5

In/Out

Data 3 [Data 4]

6

In/Out

Data 4 [Data 5]

7

In/Out

Data 5 [Data 6]

8

In/Out

Data 6 [Data 7]

9

In/Out

Data 7 [Data 8]

10

Out

Acknowledge* [nAck]

11

Out

Busy [Busy]

12

Out

Paper Empty [PError], returns paper

 

 

empty status if FRPO O2=2

13

Out

Online (Select) [nSelect], returns off-

 

 

line status if FRPO O2=2

14

In

Auto-feed [nAutoFd]

15

-

Not connected

16

-

0 V DC

17

-

Chassis GND

18

-

+5 V DC

19

-

Ground

20

-

Ground

21

-

Ground

22

-

Ground

23

-

Ground

24

-

Ground

25

-

Ground

26

-

Ground

27

-

Ground

28

-

Ground

29

-

Ground

30

-

Ground

31

In

Ignored [nInit]

32

Out

Error*, returns error status if FRPO

 

 

O2=2 [nFault]

33

-

Not connected

34

-

Not connected

35

Out

Power Ready

36

In

Ignored [nSelectIn]

Table B-1

B-1

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HP WP36/50 manual Appendix B Host Computer Interface, Parallel Interface Communication Modes, Interface Signals
Page 102 Page 104

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