Dataman 48UXP - Manual (Page 56)

Manufacture recommend the user can run self-test of
Dataman-48UXP prior to each day’s operation. The self-test
routine including testing the parallel port, LED display, Pin
driver, TTL driver, relay, D/A converter’s voltage drop and
other parameter, following is the example test result screen.
If any of unexpected state display with purple color has been
display or any error message report after the self-test, your