Specifications

Touch Controllers Reference Guide16
MicroTouch recommends that you use N, 8, 1 (no parity, 8 data bits,
and 1 stop bit) and 9600 baud for most touch applications. All
MicroTouch touchscreen drivers communicate with the controller at
N, 8, 1, 9600.
For the TouchPen controller, MicroTouch recommends 19200 baud
for use with character recognition systems that require high pen data
rates. Systems that cannot handle the higher data rates seen from the
pen may result in degraded pen performance. To improve
performance on these systems, use a slower baud rate.
Automatic Baud Rate Detection
As listed in Table 2, AutoBaud Enable is the factory default for some
touchscreen controllers. However, MicroTouch recommends that you
disable autobaud for several reasons.
When AutoBaud is enabled, the controller changes its communication
rate to that of the next command from the host system. Thereafter,
the controller sets its communication rate to the first command
received from the host system after powering on the unit.
Although the AutoBaud Enable command sets the communication
rate, it does not automatically set the parity, the number of data bits,
and the number of stop bits. The controller cannot communicate with
the host system unless all communication parameters are the same.
Because this automatic feature is limited to the communication rate,
MicroTouch recommends that you issue an AutoBaud Disable
command to turn off the AutoBaud feature. After you disable
AutoBaud, send a Parameter Set command to change the
communication parameters (parity, number of data bits, number of
stop bits, and baud rate).
!