Well, this topic doesn't meet so much success ...no matter, I continue to share my investigations
I Had responses from the manufacturer's doc (IMO): the function 16 is definitivly not supported ...
I see 2 solutions now :
deal with the function 01 (ReadCoilStatus) and 05 (WriteCOil), I wait some answers from IMO to tell me how I could use this fn without getting back a, (Out of Range Data) error
bypass the built-in fonctions of Mango to write values directly to the slave using the function 06 (WriteRegister) wich I know is well supported, and a routine to calculte the good value to write (read register value, then add or substract 2^n) then write the result). All of this with the help of the Process Event Handler.
SO I've a new question for the masters : is there a trick to call a internal procedure of Mango (from Unix CLI) to write a register to a slave ? As Mango is Master, I cannot use another external program to do this ....
If it does'nt disturb too much , I will continue to write my relfexions in this topic, perhaps some day .... 8)