Hi dave. Thanks for reply, sorry for missundertsanding maybe need to need more specific. The hardware is a counter coins that works whit a rs232 follow his behavior whit sniffer port the parity of device works is 9600,M,1. I`m trying to connect via bluetooth whit app inventor to drive this unit. testing in computer i can see all the string, because windows support all parities, now when put the bluetooth to the unit i can`t get the string for example 01,08,16,21,26,F8,55 (20 coins dispensed code) i didn`t receive the complete string setting the bluetooth whit at commands i get this under 9600,N,0 (received 01 everything else ignored),9600,1,0(received 01,21,55), 9600,e,1 (01,08,21,26),9600,o,1(16,F8,55), in this case could be neccesary to change parity and stores data in array (maybe in 16f628)and try to send but i think that bluetooth at the end are be set on a fixed parity and the final result are be the same for this reason i want to try to change parity on the fly. But honestly i don`t have an idea about how i can drive properly the parity. Thanks again for any reply about this issue. Brainless