Ultrasonic sensor, serial communication.

[louislouis]

Hi Folks,
I need a little help with this task. I want to read data from Ultrasonic distance meter which put out every 100ms serial data.
The protocol is here:

The captured data looks like:

My program trying to capture this data looks like:

#CONFIG
  __config _CONFIG1, _FOSC_INTOSC & _WDTE_OFF & _PWRTE_ON & _MCLRE_OFF & _CP_OFF & _CPD_OFF & _BOREN_ON & _CLKOUTEN_OFF & _IESO_ON & _FCMEN_ON
  __config _CONFIG2, _WRT_OFF & _PLLEN_ON & _STVREN_ON & _BORV_19 & _LVP_OFF
#ENDCONFIG

;MCU PIC 12F1840

DEFINE OSC 4        ; Use internal clock 4MHz 
OSCCON  = %01101010 ; 4 MHz internal
OSCTUNE	= %00000000	; Internal osc tunning

TRISA = %100000     ; RA.5 input rest output
ANSELA = %00000  
OPTION_REG.7=1      ; disable internal pull-ups
APFCON = %10001100 

string var byte[16]

' Set receive register to receiver enabled
DEFINE HSER_RCSTA 90h 
' Set transmit register to transmitter enabled
DEFINE HSER_TXSTA 24h                             
DEFINE HSER_BAUD 9600 

clear

start:

hSerin 100,start,[wait ($ff),str string\16]

pause 100
       
HSEROUT [hex string,13,10]

pause 500

goto start

obviously it doesn't work because my poor programming skills.
I searched the forum to find something to point me how to capture these data but no success.
Can someone point me how to do that?
Thanks,
Louis