p201 explicitly disable default output channel
After discussing with @alejandro.homs,
In ct2 config,
because a channel used or not used as an output always requires a dedicated section under channels:
,
it appears that the best default in order to be compatible with the actual behavior on beam lines would be to
keep the channel 10 as an output by default and (when required) explicitly disable this default Output with:
external sync:
output:
channel: None
So by default, channel 10 is used as an output and if users need to use the channel 10 as a counter then they will have to set output_channel=None from the config.