User`s guide

DC 900-1343D 11
Preface
Purpose of Document
This document describes the operation and programming interface required to use
Simpact’s Digital Data Communications Message Protocol (DDCMP) product, which
is a point-to-point serial line protocol. The DDCMP software runs on either a Simpact
Freeway communications server or on a Simpact embedded ICPs. The DDCMP imple-
mentation complies with the DDCMP Specification, version 4.0, AA-D599A-TC (with
a configuration option to use version I2).
Note
In this document, the term “Freeway” can mean either a Freeway
server or an embedded ICP. For the embedded ICP, also refer to
the user’s guide for your ICP and operating system (for example,
the ICP2432 User’s Guide for Windows NT ).
Intended Audience
This document should be read by programmers who are interfacing a client application
program to Simpact’s DDCMP product running on Freeway. You should understand
the Freeway data link interface (DLI), as explained in the Freeway Data Link Interface
Reference Guide , and be familiar with the communication message formats required by
the DDCMP protocol.