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NDA-24233 Issue 2 Page 1-1
VisuaLink 128/384 Engineering Guide Chapter 1
Chapter 1: VisuaLink Command Fundamentals
Preface
Thank you very much for purchasing the VisuaLink 128 or VisuaLink 384.
VisuaLink is suitable for a conference with one to three people on a site, and it is a device to realize a
multimedia communication of video, voice, and graphic information by connecting to an ISDN line.
This document explains the external console of the VisuaLink from a console such as a personal computer.
NEC Corporation
Notes to Remember:
(1) It is prohibited to copy a part of or the whole of the contents of this document without permission.
(2) The contents of this document may be modified without notice.
(3) We did our best in creation of this document; however, if you notice any problems, errors, and
omissions, please let us know.
(4) We are not responsible for the result of any operation of the device regardless of the above note.
(5) Please prepare countermeasures such as recovery and backup for possible failures on a system side
when you use this device in a system in which a superior reliability is expected.
1.1 Summary
VisuaLink is equipped with a serial external control port that enables a control from a console such as a
personal computer.
The VisuaLink executes a command and returns a response based on the inputting of a command that consist of
4 characters or one character and three numbers.
1.2 Communication Outline
Communication protocol between the VisuaLink and a console are consisted of the following:
[1] Command: A protocol issued by a console executes a process on VisuaLink.
[2] Response: A protocol that issues a result for a command to a console. It is always issued at a command
reception. Responses are normal ending response and error response.
[3] Report: When a status is changed inside VisuaLink, a change notice such as an alarm is issued to a
console. Message protocol is issued independently from a command.