Moving Coordinate of Touch Field Press

When a previously defined touch field (see Create/Define Touch Field) is pressed and the location of the press is changed, and the reporting of the movements is switched on via Enable/Disable Reporting Movements, the movement is indicated by

M key_char ev_coord_x ev_coord_y [ACK]

where key_char is the non-zero character assigned to the touch field previously defined and ev_coord_x / ev_coord_y is the coordinate of press relatively to the upper left corner of the corresponding touch field.

Multi Touch

When more than one touch point are evaluated simultaneously, a point ID is appended to the movement reports

M key_char point_id ev_coord_x ev_coord_y [ACK]

where point_id is a unique ID automatically assigned to the touch point (finger).

The number of concurrently reported touch points can be set by the command Set Number of Touch Points.

Note

The coordinate may turn negative. The minimum / maximum coordinate values which can be reported can even fall outside the physical screen by one pixel when converted to absolute coordinates.
The distance threshold for movement reports can be modified with the command Set Threshold for Movement Reporting.