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X200: Video Compensation

This article covers X200/R, X200A/R, X200AS/R, X200-USB/P, X200AS-USB/P, also known collectively as the X200.

Long cable lengths can affect video signals, especially when higher screen resolutions are used. In order to eliminate any video signal degradation, Adder X200 extenders provide effective software-based video compensation features.

To use video compensation (sharpness and brightness)

  • On the user keyboard connected to an Adder X200 extender, simultaneously, press the hotkeys (by default, CTRL and SHIFT) along with 1 for the first port of 2 for the second. Now enter video configuration mode, on the same keyboard, simultaneously, press the hotkeys (CTRL and SHIFT) along with ENTER.

    The three keyboard indicators (‘Num Lock’, ‘Caps Lock’ and ‘Scroll Lock’) will now begin to flash in sequence. The speed of the sequence indicates the level of the sharpness adjustment currently applied: the slower the rate, the lower the level of sharpness being applied
    CATX4000 VideoCompensation4

  • While viewing the displayed screen image, use the following keys to adjust the controls:

    Sharpness: Use the Up and Down cursor keys for fine adjustment, PageUp and PageDown for coarse adjustment. There are 255 sharpness levels (one coarse step jumps 10 levels). To autoset sharpness: Press to make the module calculate and apply an automatic compensation level - you can use this as a starting point for your fine tuning. Note: If the monitor goes blank and switches off (due to oversetting the sharpness adjustment) press the Home key to restore.

    Brightness: Use the Left and Right cursor keys for adjustment. There are 255 brightness levels. 
    CATX4000 VideoCompensation5

  • When no shadows are visible and the displayed images have crisp edges, press Enter to exit configuration mode and permanently save all settings. The new compensation settings will be stored, even when power is removed or if a complete reset is initiated. These settings should not require further changes unless the cabling arrangements are altered.!!!Remote user skew adjustment

To use skew adjustment (X200AS models only)

The category 5, 5e and 6 cabling supported by the AdderView CATx consists of four pairs of wires per cable. Three of these pairs are used to convey red, green and blue video signals to the remote video monitor. Due to the slight difference in twist rate between these three pairs, the red, green and blue video signals may not arrive at precisely the same time. This is visible as separate colour shadows on high contrast screen images and is particularly apparent when using higher screen resolutions and some types of category 5e cables.
To alleviate this situation, the Adder X200AS/R modules provide internal skew adjustment that can help to rectify the situation. The skew adjustment works by delaying or advancing the timing of any of the red, green or blue colour signals so that they are all delivered to the monitor at precisely the same time.

  • Download the test pattern.
  • On the keyboard connected to an Adder X200AS extender, simultaneously, press the hotkeys (by default, Ctrl and Shift) along with Enter to enter configuration mode.
    The three keyboard indicators (‘Num Lock’,‘Caps Lock’ and ‘Scroll Lock’) will now begin to flash in sequence. 
    CATX4000 VideoCompensation6

  • As appropriate, press either the R, G or B keyboard keys to select the appropriate colour channel. Corresponding keyboard indicators will flash rapidly to show which channel is currently selected for adjustment:Num Lock for Red, Caps Lock for Green and Scroll Lock for Blue.
    CATX4000 VideoCompensation7

  • Press the Left and Right cursor keys to retard or advance the timing of the selected colour channel respectively. On screen you will see a change in the position of the selected colour crosses (or colour bars) in relation to the other two.
    CATX4000 VideoCompensation8

  • When the selected colour crosses (or colour bars) are correctly positioned, press Enter to exit that colour channel. The keyboard indicators will return to flashing in sequence.
  • If required, repeat steps 3 to 5 to select and adjust any colour channel until the vertical lines of the red, green and blue crosses are all aligned.
  • When all colours are correctly aligned on all video channels, press Enter to exit configuration mode and permanently save all settings.


Once you have made the skew adjustments, it may be necessary to re-adjust the image controls to attain optimum screen images.


Page last modified on Wednesday December 2, 2020 13:43:48 GMT-0000