Daktronics DataTime Outdoor LED Time & Temperature Displays - Manual (Page 24)

Power On Self-Test
A useful troubleshooting tool is the power on self-test the host driver performs every time it
powers up:
1. Driver Firmware version (r:XX)
2. Address (Ad:XX)
3. Line number (L:X)
4. Columns (1234)
• If the signal wiring between each controller is correct, the first two digits of each
driver will display “Ad” momentarily, and the first digit will then flash three
numbers indicating the decimal address that is set with the address switch. (If a
client driver displays “A ,” followed by “P ,” it is not
receiving “signal in,” and is performing its own self-test.)
• The first two digits of each line will display “Lx”, where “x” is the line number
that the driver is set to control using the address switch (set with address plug on
older drivers).
• Each line will display “1234…” according to the column number of each of its
digits. Every line should show “1” on the left-most digit, and all digits should be
numbered consecutively from left to right. If this is not the case, either the wrong
address is set, or the driver or digit harness is connected incorrectly.
If no address is set on the host driver, it will display “E5,” and all client drivers will
continually cycle through the power on self-test.
20 Maintenance and Troubleshooting