Demonstration 2: Remote Control of a Fieldbus Display (Display Applet)

In this demonstration you will remotely control a CAN fieldbus display which is installed in the Automation Lab of the Fachhochschule Reutlingen. In order to provide a visual feedback of the status of the Display we also installed an interactive Web camera. Figure 1 depicts the hardware and software setup of this demo.


Figure 1: Display Setup

Instructions:

  1. The Display-Client is automatically started while this web site is loaded and appears as a separate Java applet window on your desktop. The client then tries to allocate the Display-Server. When it succeeds, the Selectron I/O module (see Figure 1) is reset to its default state and Applet Ready appears in the status line of the window.
  2. Open a new browser window by clicking the 'Open Web Cam' button.
  3. Please wait until you receive access to the camera and the words 'You are in control' appear in the status display of the camera remote control. This may take some time depending on the number of users currently competing for access to the camera.
  4. Clicking on Preset 1 on the camera remote automatically focuses the camera on the display
  5. You can control the status of the individual letters of the display by (de)activating the corresponding checkbuttons of the Display-Client and observe the results with the camera. Further feedback is provided by changing the colors of the letters in the Display-Client window with respect to the current activation state of the corresponding output line of the I/O module. The 'Start' and 'Stop' buttons let you start or stop a dynamic modification of the status of the display.

Troubleshooting:

This Link may help you.

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