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The error detection for dead loops is performed by watch-
dog (see below).
You can use special setup codes, perform selftest procedures
for LCD, keyboard, EEPROM, relays and LEDs, watchdog.
The operation of these functions is outlined in the setup
section. The selftest procedures are described in detail in
the following subsections.
DISPLAY SELFTEST
The display selftest procedure consists of lighting up all of the
display segments together. The Display test is announced
by a scrolling “Display test” message.
The segments are lit for a few seconds
and then switched off before exiting the
selftest procedure.
KEYBOARD SELFTEST
The keyboard selftest procedure begins with the message
“Button test, press LCD, CAL and SETUP together to escape”.
The LCD will then show only a colon.
As soon as one or more keys are pressed, the appropriate
segments out of 88:88 corresponding to the pressed keys,
will light up on the screen.
For example, if LCD and
are pressed together the LCD
will look like this:
