MS/TP Trouble Shooting With Multi-Meter

Many times I've gotten call's from customers saying their data company pulled new Ethernet cables and now one of the MS/TP comm buses on their Niagara-Ax Jace is not communicating at all. Before getting out my laptop, I  get out my Fluke multi-meter using these steps to isolate the problem. 

With your multi-meter set to ohms.

 Step 1: Remove ground/drain wire from Niagara-Ax Jace comm plug.

 Step 2: Place meter leads black lead on the drain wire and the red lead to earth ground .

             a:  3 ohms and above shield not grounded at all.

             b.   less than 3 ohms grounded in more than one place.

             c:  0 ohms is normal reading

With your multi-meter set to DC check comm bus.

  Step 1: Place red lead on positive terminal and black lead on negative terminal of the Niagara-Ax Jace comm plug.

              a: below 200 MV wires shorted.

              b.200 MV normal

              c:above 500 MV one side is not connected.

  

 Check for miss wired net/communicating sensor, from com bus.

  Step 1: Place red lead to comm bus + terminal on the Niagara-Ax Jace the black lead to earth ground.

  Step 2:Place red lead to earth ground and the black lead to the - negative terminal on the Niagara-Ax comm plug.

              a: 2 to 2.5 MV normal reading

              b: 3 to 12 MV net sensor miss wired or shorted

              c: less than 700 MV short to shield

Change multi-meter to AC

  Step 1: Place red lead to comm bus + terminal on the Niagara-Ax Jace the black lead to earth ground.

  Step 2:Place red lead to earth ground and the black lead to the - negative terminal on the Niagara-Ax comm plug.

             a: 2 volts is normal

             b: greater than 2 volts bad or miss wired controller putting voltage on comm wire

             c: less than 2 volts short in comm wire,

 If you get bad read from any of the test,You'll want to deploy the divided conquer method to track down the issue. 

  Step 1: Go to the middle of the MSTP bus and remove the comm bus from the controller. The check voltage and ohms on both wires to locating the bad wire.Leave comm bus wires separated.Go to step 2

  Step 2:  Go to middle of bad the wire, split trunk again.Check voltage and ohms both ways, finding the bad wire.Leave comm bus wires separated.Go to step 3

  Step 3: Repeat steps 2 until you find short or bad voltage.

How to configure Niagara Web Start Java AX 3.8.111

Following the gradual abandonment of Java plugins in almost all internet browsers, Tridium has finally adapted its 3.8 platform to use Java WebStart

Java web Start is an external application that does not use the browser, which makes it easy to connect to the control system without using a plugin.

NOTE

If you have a Supervisor server

In order to use the web start, you must have previously installed the Niagara AX 3.8.111 version in your supervisor or controller

You must also have JAVA installed in your PC ( http://www.java.com/en/ )

For more information, please consult Integra Controles

Prerequisites

You must make sure that JAVA is installed on your PC before

The java is available for free here https://www.java.com/en/download/windows_xpi.jsp

Disregard any incompatibility warnings as Java will not be used with the browser.

Following the installation of JAVA, pass the the next step

To use Java Web Start

Open your browser 

In the address bar of your browser type the address of your Jace

At login, Click on "Click here"  , at the bottom of "To connect using java web start" 

When the file is downloaded to the desktop, close the browser.

Click on the new icon "JACE NAME.jnlp"  (saved on  the desktop or downloads)

The first time click on "do not show this again ..." and press "Run"

From now on you will no longer use an internet browser.

Click on the icon " name of your .jnlp system " and enter your user and password the Web Start interface is similar to that of a browser, but it does not require any plugin