Specifications

Touch Controllers Reference Guide50
Format Tablet
Syntax: <SOH>FT<CR>
Description: Outputs the X, Y touch coordinate data in a 5-byte packet. The
packet includes 1 status byte and 4 bytes of binary X, Y coordinate
data. The protocol also establishes the X and Y coordinate output as
14 binary bits providing a range of 0 to 16,383.
The low order bits (X3 – X0 and Y3 – Y0) are not significant in a
1024 by 1024 touchscreen because data can fluctuate with each touch,
and therefore may not be completely accurate.
To use Format Tablet, the controller and host system must be in an
8-bit data communication mode. The Format Tablet command returns
a negative response if the controller is in 7-bit format.
Format Tablet is the most efficient packet (sends approximately 192
packets per second at 9600 baud). It also contains touchdown and
liftoff information. Format Tablet is the standard for MicroTouch
product development.
For comparison, Format Hexadecimal and Format Decimal (which
send approximately 106 packets per second at 9600 baud) are not as
efficient as Format Tablet. These data formats do not contain
touchdown and liftoff information unless you also use the Mode Status
command.
Response: <SOH>0<CR> Positive response.
After the controller is in Format Tablet mode, touching the screen
causes the controller to return a response in the following format:
SXxYy
S = Status byte; first byte of data. Refer to Table 9.
X
x = X (horizontal) coordinate data; second and third bytes of data.
Yy = Y (vertical) coordinate data; fourth and fifth bytes of data.