NEC Visualink 128/384 Engineering Guide

							NDA-24233 Issue 2Page v
VisuaLink 128/384 Engineering Guide Table of Contents
Chapter 4:  Error Response Table  ............................................................................ 4-1
Chapter 5:  List of Factors for Disconnection in Table  .......................................... 5-1
Appendix A:  Pin-out Specification ...........................................................................A-1
Appendix B:  Line Speed Specifications ..................................................................B-1
Appendix C:  ISDN Q.931 Cause Code Definitions ..................................................C-1 
						

							NDA-24233 Issue 2Page vi
VisuaLink 128/384 Engineering Guide List of Tables
List of Tables
Table 1:  VIDEO Command  .................................................................................................... 2-1
Table 2:  AUDIO Command  .................................................................................................... 2-1
Table 3:  LINE Setting Command  ........................................................................................... 2-1
Table 4:  DATA Command ...................................................................................................... 2-2
Table 5:  ISDN Registering/Setting Command........................................................................  2-2
Table 6:  Camera related Registering/Setting Command ......................................................... 2-2
Table 7:  Communication Status Reading Command  .............................................................. 2-2
Table 8:  Alarm related Command ........................................................................................... 2-2
Table 9:  History Reading Command  ...................................................................................... 2-2
Table 10:  Registering Local Location Name Command  .......................................................... 2-3
Table 11:  Serial Port Control Command ................................................................................... 2-3
Table 12:  Acquiring Version Command  ................................................................................... 2-3
Table 13:  Maintenance Command  ............................................................................................ 2-3
Table 14:  Report Response Control Command  ........................................................................ 2-3
Table 15:  Maintenance and Other Command  ........................................................................... 2-3
Table 16:  Maintenance and Other Command  ........................................................................... 2-3
Table 17:  Model Identification Command  ................................................................................ 2-4
Table 18:  Audio Training Command  ........................................................................................ 2-4
Table 19:  ISDN Control Command  .......................................................................................... 2-4
Table 20:  Camera Control Command  ....................................................................................... 2-4
Table 21:  Option Control Command  ........................................................................................ 2-4
Table 22:  Multi-point Conference Control   .............................................................................. 2-4
Table 23:  Opening Message Command  .................................................................................... 2-4
Table 24:  Communication Status Report Command  ................................................................ 2-5
Table 25:  Alarm Status Report Command  ................................................................................ 2-5
Table 26:  Video Status Report Command  ................................................................................ 2-5
Table 27:  Participating Status Report Command ...................................................................... 2-5
Table 28:  ISDN - Report Command  ......................................................................................... 2-5
Table 29:  Camera Control Report Command  ........................................................................... 2-5
Table 30:  Option Control Report Command ............................................................................. 2-5
Table 31:  Other Report Command  ............................................................................................ 2-5
Table 32:  Multi-point Related Report Command  ..................................................................... 2-6
Table 33:  Multi-Screen Related Report Command ................................................................... 2-6
Table 34:  Microphone Command  ............................................................................................. 2-6
Table 35:  System Error Command ............................................................................................ 2-6
Table 36:  On-Screen Display  ....................................................................................................2-6
Table 37:  Current Power OFF Condition .................................................................................. 2-6
Table 4-1:  Error Response Table  ...............................................................................................4-1 
						

							NDA-24233 Issue 2Page 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. 
						

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Chapter 1 VisuaLink 128/384 Engineering Guide
1.3  Physical/Electrical lnterface
The external control port is at the back of the VisuaLink and uses DIN8 pin connectors.  The maximum length 
of the control cable shall be no more than 20 ft. (6.1 meter) due to electric characteristics.  Connector pin 
positions are as follows:
Note:
  Directions of signals are output from VisuaLink.
NO Name Direction Features
1 RS OUT Request to Send
2CS IN Clear to Send
3 SD OUT Send Data
4 GND - Signal Ground
5 RD IN Receive Data
6
7 DTK OUT Data Terminal Ready
8 DSR IN Data Set Ready 
						

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VisuaLink 128/384 Engineering Guide Chapter 1
1.4  Communication Format
Communication between a console and VisuaLink 128/384 is done in a start-stop synchronization of the 
following format.
Data Format
Data Length: 7, 8 bit ASCII code
Stop Bit: 1 bit
Parity: Even, Odd, NONE parity
Baud: 1200, 2400, 4800, 9600bps
Note:
 Default setting for VisuaLink is 9600, 8, none, 1.
To change the default setting use the SSPR command.
A: Connect terminal to VisuaLink Serial 2
B: Set terminal application to:
Baud:  9600
Parity:  Even
Bit:  8
Stopbit:  1
C: Calculate the Baud, Parity, and Bit
D: Set system parameter command for the appropriate setting
Example: SSPR 168=21
Means:  Your VL in now set up for 2400, 8, EVEN, 1
E: Reset the VL.
START
1 23456789STOP AS CII 8bit
PT Y
b7      b6      b5      b4      b3       b2       b1      b0
Not in use
00 : 7 bit | EVEN | STOP
01 1 7 bit |ODD | STOP
10 : 8 bit | EVEN | STOP
11 : 8 bit | NONE | STOP
00 : 1200bps
01 : 2400bps
10 : 4800bps
11 : 9600bps
Not in use 
						

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Chapter 1 VisuaLink 128/384 Engineering Guide
Command Format
Command: Transmit 4-character commands (only upper case can be used)
Space: More than one space is transmitted between a command and a parameter
Parameter: If a command requires a parameter, a parameter is assigned. (Only upper case can be used)  
However, if parameters are more than one, more than one space is transmitted between parameters.
CR: Transmit Carriage Return Code
 (ODH).
LF: Transmit Line Field
 (OAH)
Response Format
When the VisuaLink 128/384 is provisioned and controlled with a console, VisuaLink 128/384 always sends a 
response. Responses are normal response and error response.  When sending a command from a console, 
please transmit the next command after checking a response.  A response is transmitted in the following 
format.
Normal Ending
Parameter:   If a command is inquiring a provisioned value, a response parameter is returned. If there is no. 
parameter, it is omitted. However, if parameters are more than one, more than one space is 
transmitted between parameters.
Space: More than one space is transmitted between a command and a parameter.
CR: Transmit Carriage Rerun Code
 (ODH).
LF: Transmit Line Field
 (OAH)
Error Ending
ERRxx: Three-character ERR
 and a 2-digit error number are transmitted indicating a failure.
CR: Transmit Carriage Return Code
 (ODH). 
LF: Transmit Line Field
 (OAH)
Report Format
Command: Transmit 4-character reports Command (only upper case can be used)
Space: More than one space is transmitted between a command and a parameter
Parameter: If a command requires a parameter, a parameter is assigned. (Only upper case can be used)  
However, if parameters are more than one, more than one space is transmitted between parameters.
CR: Transmit Carriage Return Code
 (ODH).
LF: Transmit Line Field
 (OAH)
Command Name
Space Parameter CR+LF
Response Parameter (when required)
OKCR+LF
ERRxx CR+LF
Command Name
Space Parameter CR+LF 
						

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VisuaLink 128/384 Engineering Guide Chapter 1
1.5  Communication Procedure
There is no procedure for communication between a console and VisuaLink as a rule. Therefore, a 
communication line is presumed to be error-free. When it is remotely operated with a modem, efficient 
operation may not be expected when a line error occurs. Because of this, in a remote control, a modem with 
error correction feature shall be used, or VisuaLink shall be checked for operation.
Command/Response Procedure
VisuaLink transmits a confirmation on whether a command is received and the process is completed. After 
sending a command, please always analyze the transmitted response before issuing a next command. If the 
next command is issued before a response, an error response such as currently processing may be returned.
(1) Command 1 is issued using the external control port rather than a personal computer.
(2) Analysis of a received command (parameter error, etc.) is implemented.
(3) After an analysis, if it is normal, a normal response is transmitted to a personal computer after 
transmitting to the remote in communication. However, if it is error response, the error shall be 
analyzed, and a command shall be either suspended or re-issued.
(4) After verifying that Response 1 is normal, issue Command 2.
Note:
 After issuing a command from a console, if an alarm emits in VisuaLink, an alarm report may be 
transmitted before a response to the command.
Abnormal Handshake Procedure
When the VisuaLink receives a report command from a remote unit at a time the VisuaLink is sending a 
command to the remote unit in communication, the VisuaLink transmits an indication to a PC using the 
external control port and then transmits a command to the remote unit.
PC Console VisuaLink
Command 1
Command 2
Response
Response
Console VisuaLink              Remote
Command 1
Report Command
Response 1Command 1Report 
						

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Chapter 1 VisuaLink 128/384 Engineering Guide
(1) Command 1 is issued using the external control port rather than a personal computer.
(2) If a report is received from the remote unit before a transmission of Command 1, it transmits a report to 
a PC and then transmits Command 1 to the remote unit. It transmits Response 1 to the PC after the 
transmission. However, in parameter error and etc., it immediately transmits an error response. When an 
error response is received, it analyzes the error contents and suspends the command issuance or reissues 
a command. 
						

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VisuaLink 128/384 Engineering Guide Chapter 1
1.6  Connecting and Incoming Call Control Basic Sequence
Connecting and incoming call control basic sequence (when the incoming call mode of the VisuaLink 
receiving a call is set to the manual incoming call setting) is shown in the following.
Note 1:
  Detailed sequence in a network is omitted in this description. 
Note 2: 
 Parameters of each command is omitted in this description.
ConsoleVisuaLinkISDN
VisuaLink Console
NCRN
Call Origination
Incoming Call
NINC
NCIC Connecting
Connecting OK
NALT
NONLConnectionConnection
OK
NONL
NDSCCommunicating
Disconnect
Disconnect
NDCI
OK
NDCI 
						

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Chapter 1 VisuaLink 128/384 Engineering Guide
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