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A-52 IntelliTouch/SecureTouch Guide
• Intermittent touch data. If the system is reporting touch data at a slow or
varying rate, the problem may be caused by a low signal strength or
excessive noise in the system. Generation of touch data when the touchscreen
is not touched is most likely caused by excessive system noise. See the
sections and, page and, respectively. Use of SAWDUMP (a DOS utility
included with most Elo driver software and available on Elo’s website,
www.elotuch.com, may help to identify these problems. Contact Elo
Application Engineering, 1-800-557-1458 ext. 6, for more information.
• Linearity. As the IntelliTouch system is inherently stable and drift-free,
apparent linearity problems are usually due to video alignment errors or
display drift. See Video Alignment Problems, page 51.
The remainder of this appendix deals with component-level troubleshooting of
controllers, power supplies, the touchscreen, and cables.
Serial Controller
The 2310B operates at 9600 baud, 8 data bits, 1 stop bit, and no parity. See page
75 for controller jumper settings.
The 2500S operates at 9600 baud.
Using the COMDUMP Utility
COMDUMP is a DOS utility included with most Elo driver software and
available at www.elotouch.com. Use COMDUMP to verify basic controller
functionality and to determine whether or not data is reaching the serial port.
COMDUMP can be run without a touchscreen driver loaded.
Type”COMDUMP <n>” where <n> is the number of the COM port. Detailed
instructions can be found on Elo’s Web Tech site, www.elotouch.com/support.
If you are not running under DOS, boot your PC from a DOS diskette before
running COMDUMP. If you cannot run DOS (use an ASCII terminal or a
communications program in local mode to get a similar type of analysis
provided by COMDUMP). Another option is to temporarily connect the
touchscreen to a PC with DOS and run COMDUMP.
If the hardware is functioning properly, untranslated (raw) coordinates will be
returned at a constant rate only when the touchscreen is touched. If no data is
transmitted on touch, or if data is transmitted when the touchscreen is not
touched (either continuously or intermittently), you have a hardware problem.
If the LED is accessible, and indicates that data is being transmitted, confirm the
communication parameters, then try another serial port, possibly on another
computer. Also see RS-232 Connections, page 54.