HP Support Online Guide DWINTRFC
Printer Interface HP DeskWriter Printers
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
Clocked Serial
92215S M0197
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-
RxDGround
HSKo or DTR
1
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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