Pulnix TS-9720EN Series Manual de usuario descargar pdf (Pagina 27)

Page 17

Interfaces

VIS 300/400 EN ImageServer User’s Guide

7 Interfaces

7.1 Process Server interface

The interface to the process server is defined using ASN.1 notation (Abstract Syntax Notation One).

The ImageServer uses an open source ASN.1 compiler available at:http://lionet.info/asn1c/.

There are also many other ASN.1 compilers to choose from, depending on the target platform and target

programming language. The ASN.1 specification for the ImageServer to ProcessServer is listed below.

________________________________________________________________________________

-- ImageServer-ProcessServer INTERFACE SPECIFICATION

-- Notes

-- =====

-- All messages will be prefixed by a 32bit integer in network byte order

-- (most significant byte first). This prefix will contain the length (in bytes) of

-- the message (excluding the prefix). This prefix is not part of the ASN.1 message

-- definition!

-- This integer is needed because TCP/IP is stream based and not message based.

-- Sockets

-- =======

-- The ImageServer-ProcessServer interface will be implemented via a single TCP/IP

-- socket on each machine.

-- The ProcessServer system is the server, ImageServer is the client.

-- transaction-id

-- ==============

-- Every message will have a transaction id. Responses to messages will use the

-- transaction id of the original message. Not every message will require a response.

-- If a message needs no response then a transaction id of zero may be used.

-- ProcessServer allocated transaction-id's will be positive whole numbers.

ImageServer

-- allocated transaction-id's will be negative. This will allow the recipient of

-- a message to determine whether a message is a response or an unsolicited

-- message.

-- Link Establishment

-- ==================

-- When the ImageServer connects to the ProcessServer, the ImageServer starts

-- by sending an alive message.

-- link-check Messages

-- ===================

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Pulnix TS-9720EN Series Manual de usuario Pagina 27