IDX CW-5HD - Manual (Page 12)

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3.2 CW-5HD Link Initialisation (common to TX/RX)
When the power switch of CW-5HD is turned on or the link of the transmitted
signal is lost, the CW-5HD TX and CW-5HD RX will start to search for each
other. The three LED lights will alternate on and off from bottom to top in
sequence, repeating this process until a link is established. This LED
alternating from bottom to top will indicate that the device is searching for a
link.
Searching（TX）：Green LED blinks on and off repeatedly
Searching（RX）：Green LED blinks on and off repeatedly