Why using SerOut2 and SerIn2?
The following code works perfect in RF applications, I construct my own transmitter with a BFR92A with a saw resonator and a RR3 receiver module with a range of up to 300M, your qualifier "A" or any other character is adequate handshaking.
Transmitter:
SerOut PORTA.6,N1400,["A",data,data,.....]
Receiver:
SerIn PORTA.5,N1400,["A"],B0,B1,B2,.... ' depending on how many bites you want to receive