HP WP36/50 1. Parallel Interface, 1.1Parallel Interface Communication Modes, 1.2 Interface Signals, Pin, NOTE, Auto, Normal, In/out, Table B-1, High-speed, Description

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 prescribed for Centronics interfaces.

High-speed

This mode enables faster data transmission between the printer and the host computer. (Select this mode if printing problems 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 outgoing 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