DSM: SAFE setting how to

Protocols_Details.md

@@ -667,6 +667,8 @@ Notes:
  - RX output will match the Spektrum standard throw (1500µs +/- 400µs -> 1100..1900µs) for a 100% input. This is true for both Serial and PPM input. For PPM, make sure the end points PPM_MIN_100 and PPM_MAX_100 in _config.h are matching your TX ouput. The maximum ouput is 1000..2000µs based on an input of 125%.
     - If you want to override the above and get maximum throw either uncomment in _config.h the line #define DSM_MAX_THROW or on OpenTX 2.3.3+ use the "Enable max throw" feature on the GUI (0=No,1=Yes). In this mode to achieve standard throw use a channel weight of 84%.
  - TH_KILL is a feature which is enabled on channel 14 by default (can be disabled/changed) in the _config.h file. Some models (X-Vert, Blade 230S...) require a special position to instant stop the motor(s). If the channel 14 is above -50% the throttle is untouched but if it is between -50% and -100%, the throttle output will be forced between -100% and -150%. For example, a value of -80% applied on channel 14 will instantly kill the motors on the X-Vert.
+ - To allow SAFE to be ON with a switch assignment you must remove the bind plug after powering up the RX but before turning on the TX to bind. If you select Autodetect to bind, The MPM will choose DSMX 11ms and Channels 1-7 ( Change to 1-9 if you wish to assign switch above channel 7 ). Then in order to use the manuals diagram of both sticks "Down-Inside" to set a SAFE Select Switch Designation, you must have Throttle and Elevator channels set to Normal direction but the Aileron and Rudder set to Reverse direction. If setting up a new model with all channels set to Normal you can hold both sticks "Down- OUTSIDE" to assign the switch with 5x flips. Tested on a Mode2 radio.
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 ### Sub_protocol DSM2_22 - *0*
 DSM2, Resolution 1024, refresh rate 22ms