That’s ’cos RC1,2,3 & 4 are used for the control sticks
Well that has put the proverbial cat among the pigeons, and there was me thinking I was making head way, I followed painless who put his arm on a switch ??. Understanding what relates to what is the biggest problem for me, I wish the was a list explaining this…
But thanks for the heads up…
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In Ardupilot I always put my ‘arm’ on a TX switch.
I don’t like their system of a separate arm/disarm switch on the craft itself. It means you have to physically go to the craft to disarm it after a flight if the auto-disarm doesn’t kick in.
Just my personal preference 
but lots of users do and some have two stage arming.
No couldnt be bothered with that, im trying put it on 1 of the push button switches on me tango…