IDX CW-5HD - Manual (Page 14)

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5. Link modes - UNICAST/MULTICAST
The UNI/MULTI switch is used to select the link mode. The UNI/MULTI select
switches on both the CW-5HD TX and CW-5HD RX must be set in the same
mode.
5.1. UNICAST mode（1:1 communication）
With UNI/MULTI switch in UNI position, CW-5HD links in UNICAST mode. In
UNICAST mode, the link is made only between the same serial numbered pair
of TX and RX (shipped as a pair). The transmitted signals are encoded by
256bit AES and can never be intercepted by other CW-5HD devices.
CW-5HD
TX
CW-5HD
RX
CW-5HD
RX
The pair with the same serial number
CW-5HD RX from different package
The link in UNI position