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2.5. Indicators and DIP switches
Indicator
Description
①
Power
Indicate power. On when power is supplied
②
Work
Indicate working status. It blinks when N520/N540
works well. If it is on or off for a period, N520/N540
works improperly, you should power cycle to restart.
③
TX1
Blinks when port 1 sends data
④
RX1
Blinks when port 1 receive data
⑤
TX2
Blinks when port 2 sends data
⑥
RX2
Blinks when port 2 receive data