Advantech ADAM-5511 Manual page 56

There are four LEDs on the ADAM-5511 front panel. The LED's
indicate ADAM-5511's operating status, as explained below:
(1) PWR: power indicator. This LED is on when the ADAM-5511 is
powered on.
(2) RUN: program execution indicator. This LED is regularly blinks
whenever the ADAM-5511 is executing a program.
(3) COMM: communication indicator. This LED blinks whenever the
host PC and the ADAM-5511 are communicating. Please
notice: if the host COM port is connected to the ADAM-
5511's RS-232 port, this LED will normally be off. On the
other hand, if the host COM port is connected to the
ADAM-5511's RS-485 port, this LED will normally be on.
(4) BATT: battery status indicator. This LED will be on whenever the
SRAM backup battery is low.
When the main unit installation is completed, you may still need to
configure or calibrate the I/O modules inserted in the ADAM-5511
slots. The utility program ADAM5511.EXE can help you do this. See
Section 0.3.2 I/O modules configuration in Chapter 0. Greater detail is
provided in Chapter 4.