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This post explains how to calibrate two 2Touch screens to work with a stretched desktop – where the desktop spans across two display screens, with the left hand-end of the task bar in the left hand screen and the right-hand of the task bar in the right-hand screen.   (Note: The other common multiple-screen configuration is the Extended Desktop).

Stretched Desktop

Using 2Touch interactive surfaces in stretched desktop configuration

 

Stretching the desktop across two monitors is a function of the Windows operating system and the graphics card, and is not covered here.

To set up the two touch screens requires the configuration utility USB Config.  The relevant dialogue screens when using this utility are shown below.

Calibration Procedure

  1. The two touch screens are calibrated separately (i.e., only one touch screen should be connected to the computer at a time).
  2. We will call the two touch screens “Touch Panel 1” and “Touch Panel 2” respectively.
  3. Connect Touch Panel 1 to the computer using the USB cable.
  4. Run USB Config and wait a few seconds for it to establish communications (touch panel configuration data appears on the USB Config tabs).
  5. Choose File / Save to save the current Touch Panel 1 settings to a file on the computer for backup purposes.
  6. Press SHIFT CTRL C simultaneously to access the Custom Calibration Points dialog (see screen shot below).
  7. Enter the  calibration points for Touch Panel 1 (See X and Y Calibration Values below).
  8. Click the [Apply] button to commit these settings.
  9. Click the [Save] button to save the settings onto Touch Panel 1 firmware.
  10. Unplug Touch Panel 1 and plug in Touch Panel 2.
  11. Wait a few seconds for USB Config to establish communications with Touch Panel 2.
  12. Choose File / Save to save the current Touch Panel 2 settings to a file on the computer for backup purposes.
  13. Enter the  calibration points for Touch Panel 2 (See X and Y Calibration Values below).
  14. Click the [Apply] button to commit these settings.
  15. Click the [Save] button to save the settings onto Touch Panel 2 firmware.
  16. Close USB Config.
  17. Plug in Touch Panel 1 to a different USB port from Touch Panel 2.

This completes the calibration procedure. The two touch panels now behave as one touch screen covering both display units.

 

USB Config dialog

USB Config dialog

USB Config Dialog

The [Left Half of Screen] button automatically sets the calibration points to values within the left half of the screen.

Returning to Default Settings

To return to default values, go to the General tab of USB Config, and drag the calibration offset slider to zero and then back to 13%. Then click [Save] to save the settings to the touch screen controller board.

X and Y Calibration Values

A touch panel has an XY range of 32767 by 32767. In order to calibrate correctly, we need to split the X range across the two touch panels. So the X-range for Screen 1 will be 0 to 16383 and the X-range for screen 2 will be 16384 to 32767.

The diagram below shows the X and Y calibration points for each touch panel. 

TouchPanel Coordinates

X and Y coordinates for each of the two touch panels

Panel 1
Panel 2
Top left 2000, 4000 Top left 18384, 4000
Bottom right 14383, 28767 Bottom right 30767, 28767

 

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