How to switch frequency channel from ref 1 to ref 2 in ATV320

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Please refer the the below Menu Setting to enter RFC.

DRI- > CONF > FULL > CTL

For Frequency channel switching you can configure LI1 to LI6, When assigned input LIx goes high, frequency channel will change from FR1 to FR2 and vice versa or in the RFC you can set directly FR1 or FR2.

[Ref. 2 switching]-

If the assigned input or bit is at 0, channel [Cmd channel 1] (Cd1) is active.
If the assigned input or bit is at 1, channel [Cmd channel 2] (Cd2) is active.
[Ref. 1 channel] (Fr1): [Cmd channel 1] (Cd1) active (no switching)
[Ref. 2 channel] (Fr2): [Cmd channel 2] (Cd2) active (no switching)
[LIx]: Logical input LI1......LI6