Set or Clear User LED (SLED)

SLED turns the red user LED on and off under program control. The LED is on during the initial running of internal diagnostics, and then remains off unless changed by this command.

Note that the red LED can be configured to serve as an internal activity indicator (see chapter TTY Non-volatile Setups ), in which case this command has no effect.

 15  14  13  12  11  10   9   8   7   6   5   4   3   2   1   0
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|   |   |   |   |   |   |   |   |    |   |   |   |   |   |   |   |
|                           |LED|            | 1   0   0   1  0  |  Command 
|---------------------------|---|------------|-------------------|