Sorry English is not my 1st language , I`m from the Netherlands ,
If you have lost the code to your RNS , they want you to send the serial nr on your unit, Pay 30 euro . and within the hour send you the code for your RNS , So i guess there is a code calculator for it .,
answered in your pm but basically rns315 is very difficult to decode, you need expensive equipment like Martech so may be best to pay if you can find somewhere that can give code ????