HP Support Online Guide DWINTRFC

Printer Interface

HP DeskWriter Printers

This information applies to HP DeskWriter printers and Macintosh compatible dual-port printers such as the HP DeskJet 850C, 855C and

870C.

Interface information for HP DeskJet 500, 600 and 800 series printers is located in “Printer Interface/HP DeskJet Printers.”

Cable and Connector Information

Recommended Interface Cables

Cable Type	HP Cable Part Number	Apple Cable Part Number
AppleTalk Network	92215N	M2068
RS-422-A High-Speed	92215S	M0197
Clocked Serial

Interface Specifications

HP DeskWriter printers have an 8-pin mini-DIN interface connector port. This connector port is compatible with RS-422-A serial, AppleTalk, and high-speed externally-clocked serial mode communication. The printer automatically determines if it is connected to an AppleTalk network or directly to a Macintosh printer port.

Communication Modes and Supported Protocols

Category	Macintosh I/O Connector
Communication Modes	RS-422-A High-speed Serial
	AppleTalk (230.4 K Baud)
Macintosh Protocols	Serial Pacing Protocol (SPP)
	AppleTalk Transaction Protocol (ATP)
	AppleTalk Link Access Protocol (ALAP)
	Datagram Delivery Protocol (DDP)
	Echo Protocol (EP)
	Name Binding Protocol (NBP)
	Printer Access Protocol (PAP)
	Routing Table Maintenance Protocol (RTMP)

Printer Interface

HP DeskWriter Printers

RS-422 Interface Connector (8-pin Mini-DIN)

TxD+

RxD+

TxD-

RxD-

Ground

HSKo or DTR1

RS-422 Interface Port (AppleTalk)

Pin Number	Interface Pin Name	Interface Pine Description
1	DTR	Data Terminal Ready Output Handshake
2	NC	No Connection in Printer
		(Do not connect to ground or any other pin)

3	TxD-	Transmit Data Line
4	Ground	Shield Ground

5	RxD-	Receive Data Line
6	TxD+	Transmit Data Line

7	NC	No Connection
8	RxD+	Receive Data Line

Note HP DeskWriter printer interface ports conform to RS-422 and cannot be configured to operate as RS-232-C.

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