Pulnix TS-9720EN Series Instrukcja Użytkownika Pobierz pdf (Strona 28)

Page 18

Interfaces

VIS 300/400 EN ImageServer User’s Guide

-- The link will be 'kept alive' by transmitting a 'keep alive' message

-- on the link periodically when there is no other traffic in that

-- direction on the link. The keep alive message will consist of 4

-- bytes containing zeros (i.e. a byte count indicating that a 0 length

-- message follows.)

-- This will be implemented by both the ProcessServer and ImageServer.

-- Both the ProcessServer and ImageServer will assume the link is dead

-- if no messages are received over the link for a period time.

-- There will be no error detection or correction over that provided by

-- TCP.

-- Message acknowledgement

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

-- If the ImageServer or the ProcessServer does not receive an expected

-- acknowledgement message within a specific time-out period, then the

-- ImageServer or the ProcessServer retransmits the initiating message.

-- The retransmitted message is an exact copy of the original message.

-- This restriction also applies to the transaction-id.

-- If the does not receive the expected acknowledgement within the time-out

-- period, then the ImageServer or the ProcessServer continues to retransmit

-- the initiating message every time-out period.

-- It will do this for some specified number of times.

-- Receiving an acknowledgement during this time, “completes” the protocol

-- normally.

-- If the ImageServer hits the limit in the number of transmissions and does

-- not receive an acknowledgement, then the ImageServer closes the socket,

-- and connects again, and starts the protocol from "alive"

-- MESSAGES SENT BY ImageServer

-- MESSAGE RESPONSE COMMENT

-- alive (init)

-- vdt vdt-ack

-- error error-ack

-- MESSAGES SENT BY ProcessServer

-- MESSAGE RESPONSE COMMENT

-- init init-ack

-- send-file-path file-path

-- del-data del-data-ack

-- status-inq status

-- config status

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Pulnix TS-9720EN Series Instrukcja Użytkownika Strona 28