The display mode shows the actual reading and some additional information in the display. This is the default mode, the ACU enters it automatically after power on. Depending on the selected tracking mode, the default display looks like this:

or alternative

The upper display line shows the actual target name and the three axes angles. The lower line shows the selected tracking mode or alternative the remaining time between the tracking steps (selected with arrow up/down), depending on tracking mode, the size of the tracking memory and the model data or nothing, and the beacon level.

The 4-axis models of the ACU show the actual polarization 2 angle alternatively to the first polarization angle. Press the key 5 at the keypad to see the polarization 2 value:

The ACU shows ‘POLARIZATION 2’ instead of the target name and the 4th axis angle at the right edge of the upper line. After some seconds the ACU returns to the normal display automatically.

While the ACU is not in a regular state, the display shows a message. The ordinary contents of the display and the message are shown alternately, the message blinks on the display. The following messages may be displayed at the corresponding position in the display.

At the corresponding angle position:

• FAULT — General ACU Fault
• TIMEOUT — Motor moves, but the position encoder does not react
• HI-LIMIT — High limit switch is activated
• LOW-LIMIT — Low limit switch is activated
• STOPPED — Motor stopped, over Web interface or with the STOP-Button on front panel
• BEAC FLT — If the ACU reads the beacon level via TCP/IP from sat-nms LBRX and the beacon receiver does not respond
• LOW BEAC — Low beacon signal

If more than one of the above conditions occurs, only that one with the highest precedence is shown. This means for example that the HI-LIMIT state precedes over the LO-LIMIT state.