Proface FP3900 - 19 Flat Panel" - Manual (Page 57)

5.1 Touch Interface Data
5-2 FP-2500/FP-2600 Series User Manual
(2) Data Format
Touch Panel coordinate data is sent to the host using the following format.
All data is in binary format.
Header: 1 byte (11h= touched; 10h = released)
X coordinate: 2 bytes (0 to 3FFh)
Y coordinate: 2 bytes (0 to 3FFh)
If the coordinate (X=23(11h), Y=500(1F4h)) is touched and moved to
the coordinate (X=63(3Fh), Y=250(FAh)).
11h 0h 17h 1h F4h touched
11h 0h 17h 1h F4h continuous output with the same location
11h 0h 18h 1h F3h moving without releasing touch
11h 0h 3Fh 1h FAh continuous data output unless finger is released
11h 0h 3Fh 1h FAh 10h when released, only 1 unit of data is sent
Added when touch is released.
X coordinate Y coordinate
11h 10h