Pro-face FP-790T, User Manual

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Touch Panel Commands
4-4 FP-790T User Manual
(2) Data Format
All data is in 8-bit ASCII format, and is structured in the following 11 byte
strings.
Header: 1 byte (T = touched; R = released)
X coordinate: 4 bytes (0000 ~ 1023)
Separator: 1 byte (,)
Y coordinate: 4 bytes (0000 ~ 1023)
Termination code: 1 byte (CR = 0Dh)
X coordinate Y coordinate
31h ('0') ~ 39h ('9')
four digits 31h ('0') ~ 39h ('9')
four digits
54h ('T') : Touched
52h ('R') : Released 2Ch (',') : fixed 0Dh ('\n') : fixed
<Example>If the coordinate (X=23, Y=500) is touched.
T0023, 0500CR touched
T0023, 0500CR continuous output at the same location
T0024, 0500CR moving the finger without releasing touch
T0024, 0499CR
continuous data output unless finger is released
T0022, 0501CR
T0023, 0500CR
R0023, 0500CR
when released, only 1 unit of data is sent
(3) Sampling Rate
A maximum of 87 points per second.
(4) Cable Connection
Connect the RS-232C connector provided at the rear of the FP to the host’s
serial interface through the optional SIO cable.
Chapter 1 Introduction
Connect the host (PLC) data cable to the FP's rear-mounted RS-232C connector.
(Digital's optional SIO cable is recommended)
The PL's touch panel provides a resolution of “1024” (10 bit). However,
the resolution of the actual output data is only 20 to 990 (approx.).
Therefore, all the coordinates of the pixels on the horizontal axis cannot
be detected. According to this calculation, the FP's output data includes
coordinates that cannot be displayed, since the touch panel is larger
than the display device.