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Chapter
1
General Information
Introduction
The HP 98628A Data Communications Interface and HP 98691A Programmable Datacomm
Interface are microprocessor-based datacomm interfaces designed for use with HP Series 200
computers. Each interface contains a built-in microprocessor and associated circuits that per-
form all protocol management and signalling functions for data communications using RS-
232C and RS-449 connections.
The HP 98628A Datacomm Interface supports two protocols:
• Asynchronous (Async) protocol commonly used for timesharing and remote host compu-
ter applications as well as connections to remote terminals .
• HP DSN/Data Link Protocol most commonly used with Data Link network applications
based around an HP 1000 network host computer.
The HP 98691A Programmable Datacomm Interface is designed for installing custom protocols
or protocols that are designed and supported by suppliers other than Hewlett-Packard Com-
pany. This interface is usually sold through the supplier of the custom protocol firmware.
Several cable options are also available, accommodating most popular interconnections to
standard datacomm links and modems. They are discussed in Chapter 3.
1
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