Most switches in FXP.One take a value of type "yesnoauto_t". That means they can have the value of "YES", "NO" or "AUTO" and nothing else. You can always supply the actual strings to set a variable, for example, "PASSIVE=NO". The integer equivalent values are also supported. FXP.One will in general send the integer value in an attempt to limit the number of characters send/received for each command.
<int> <meaning> 0 NO 1 YES 2 AUTO
Most, if not all, YNA types default to AUTO. If their values are AUTO they are generally not printed or saved, in commands like SITELIST.