What kind of control are you using to communicate with COM port?

>
>My application occasionally had this C0000005 error and the screen
>will show the calling program line and below is the line that
>indicate causing the problem. The STX,ETX and DLE are constant
>define in the header file. It will output some character to the
>COM port. Anyone had any ideal how to solve this problem.
>
>Thank you very much
>
> lBuf = INT(VAL(lChar))
> IF lBuf = STX OR lBuf = ETX OR lBuf = DLE
> THIS.OutPort(CHR(DLE))
> lLRC = BITXOR(DLE,lLRC)
>
> ENDIF