Monday, 15 July, 2002


The CMU is really a software application run on a general purpose computer. The application runs under the Windows NT Operating System. Program, alarm log. and Trending files are held on a normal hard disk. A floppy disk drive and CD-ROM drive is required for setting-to-work and maintenance purposes.
Although two CMUs can be connected to one ATCU, only one CMU can be in control of the ATCU at any one time. The other CMU is then purely a monitor. Control can be taken away from the CMU in control ONLY IF THAT CMU RELEASES CONTROL. If control is released whilst the ATCU is carrying out an antenna move or is tracking, the ATCU will continue in its current task for a time which may be set from a CMU whilst it is in control. At the end of that time, if control has not been taken by one of the CMUs, the ATCU will drop to the STANDBY State, stopping all antenna movement.

The CMUs provide the operator-interface with TS3010. The only system data held in a CMU when it is turned off is its own serial port assignments and Trending chart display settings. All other system data is held by the ATCU, the CMU obtaining it from the ATCU as required.

If the operator takes any action which could cause disruption to signal traffic (such as stopping the Drives whilst tracking is in progress) a warning dialog box appears, requesting confirmation of the action. (This includes closing down the CMU application if it is in control of a tracking ATCU, as the ATCU will eventually stop tracking if it is not under CMU control.)

Each system alarm state is represented on this display, and its condition indicated by a green (inactive) or red (active) square. Alarm suppression is used in generating this display, so that any alarms dependant upon another are shown greyed (ie unknown) if that controlling alarm is active.

The centre of the Trending display is occupied by the Trending Chart, which represents a window on a strip chart, which scrolls to the left when in Real Time. The traces shown on the chart are:-

  1. Beacon signal strength (red);
  2. Antenna Azimuth pointing angle (white), and
  3. Antenna Elevation pointing angle (yellow).

For further information or a demonstration please contact Ian Dick at I.D. & Associates.

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