Specifications

CHAPTER 3
Controller LED Diagnostics
MicroTouch controllers are highly reliable units; however, there may
be occasions when the controller does not perform exactly as you
expected. Serial/SMT controllers provide visual feedback via an LED
indicator on the controller.
When you power-up the unit, the LED is bright until the controller
start-up sequence completes. Following start-up, the LED becomes
dim and remains dim as long as you do not touch the touchscreen.
When you touch the screen, the LED becomes bright.
A flashing (or blinking) LED indicates the controller’s power-on
self-test failed. Refer to Table 13 and Table 14 for a description of
each error code.
Some errors are nonrecoverable, meaning that normal touchscreen
operation cannot occur. Other errors assume default conditions, and
touchscreen operation can proceed. For example, an incorrect
NOVRAM checksum is a recoverable error. In this case, operation
continues using factory default conditions (as if a Restore Defaults
command was issued).