Chapter 4: Programming 4-3
• 9600 baud
• No parity
• 7 data bits
• 2 stop bits
• Format hex
• Autobaud enabled
For better compatibility with the MicroTouch DOS and Windows
drivers and mouse emulator it is desirable to select the following
communications parameters:
• 9600 baud
• No parity
• 8 data bits
• 1 stop bit
• Autobaud disabled
These parameters are loaded into the on-board EEPROM chip during
manufacture of the board.
The Windows driver expects a 9600N81/tablet configuration. Both the
DOS driver and the mouse emulator expect 9600N81, but can run at
2400 baud. The Autobaud feature permits the touch controller to figure
out what baud rate the system is running by examining a command
from the system. The problem is that the system must send the
command first. If the system sends no command (as happens after a
stand-by), the controller does not know the system's baud rate and
does not send any touch coordinate data. This is seen to the operator
as a dead sensor after coming out of stand-by. Disabling Autobaud
permits the touch controller to recover from a stand-by situation,
because it begins immediately sending points when touched after a
stand-by.
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