Proface FP3900 - 19 Flat Panel" - Manual (Page 70)

Chapter 7 Touch Panel Data
7-3
(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)
<Example>
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 F5h 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
X coordinate Y coordinate
11h 10h
Added when touch is released.