HP Support Online Guide DJINTRFC

Printer Interf ace HP DeskJet Printers

HP DeskJet Printers

The following information applies to HP DeskJet 500, 600 and 800 Series
printers.

Interface information for HP DeskWriter printers and Macintosh compatible
dual-port DeskJet printers such as HP DeskJet 850C, 855C and 870C may
be found under “Printer Interface/HP DeskWriter Printers.”

Cable and Connector Information

Recommended Interface Cables

HP Cable

Host Interface

HP IEEE-1284

Compliant Cable

HP IEEE-1284

Compliant Cable

Part Number Cable Length Cable Connectors

C2950A 2 Meters DB-25 Male to 36-Pin

Centronics Male

C2951A 3 Meters DB-25 Male to 36-Pin

Centronics Male

Interface Specifications

HP DeskJet printers communicate with computers through a single
IEEE1284-B parallel I/O interface connector. For more information about
interface connection and operation, see “DOS I/O Interface Description.”

Communication Modes and Supported Protocols

Category Specification

Interface Protocol IEEE-1284 Compatible
Communication Modes Available * Compatible (Centronics)

* Nibble
* ECP

Printer Interf ace HP DeskJet Printers

IEEE-1284 Interface Connector

IEEE-1284 Interface Port (DOS/MS Windows)

Pin

Number Source

1 Host nStrobe HostClk HostClk
2 Bi-Directional Data 1 (LSB)
3 Bi-Directional Data 2
4 Bi-Directional Data 3
5 Bi-Directional Data 4
6 Bi-Directional Data 5
7 Bi-Directional Data 6
8 Bi-Directional Data 7

9 Bi-Directional Data 8
10 Bi-Directional nAck PrtClk PeriphClk
11 Bi-Directional Busy PrtBusy PeriphAck
12 Bi-Directional PError AckDataReq nAckReverse
13 Bi-Directional Select Xflag Xflag
14 Host nAutoFd HostBusy HostAck
15

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Compatibility

Mode

Nibble

Mode

ECP

Mode

Printer Interf ace HP DeskJet Printers

IEEE-1284 Interface Port (DOS/MS Windows) (Cont.)

Pin

Number Source

16 Logic Gnd
17 Chassis Gnd
18 Peripheral Peripheral Logic High
19 Signal Ground (nStrobe)
20 Signal Ground (Data 1)
21 Signal Ground (Data 2)
22 Signal Ground (Data 3)
23 Signal Ground (Data 4)
24 Signal Ground (Data 5)
25 Signal Ground (Data 6)
26 Signal Ground (Data 7)
27 Signal Ground (Data 8)
28 Signal Ground

29 Signal Ground

30 Signal Ground

31 Host nInit nInit nReverseRequest
32 Peripheral nFault nDataAvail nPeriphRequest
36 Host nSelectLn 1284 Active 1284 Active

Compatibility

Mode

Nibble

Mode

(Perror, Select, nAck)

(Busy, nFault)

(nAuto Fd, nSelectLn, nInit)

ECP

Mode