Please help me about HM-TRP. http://www.hoperf.com/rf_fsk/hm-trp.htm

This is my PICBasic Pro Code:

Transmitter:

@ DEVICE pic12F675, intrc_osc_noclkout, wdt_off, pwrt_on, mclr_off, bod_off, protect_off

Include "modedefs.bas" ' Mode definitions for Serout

Define OSCCAL_1K 1 ' Calibrate internal oscillator

CONF Var GPIO.1
ENAB Var GPIO.2
LED Var GPIO.0
SI Var GPIO.4
SO Var GPIO.5

B0 var byte


ANSEL = 0 ' Set all digital
CMCON = 7 ' Analog comparators off

HIGH CONF

mainloop:

FOR B0=0 TO 99
Serout SO,N9600,[B0]
Pause 200
NEXT

Goto mainloop

End

Receiver:

@ DEVICE pic12F675, intrc_osc_noclkout, wdt_off, pwrt_on, mclr_off, bod_off, protect_off

Include "modedefs.bas" ' Mode definitions for Serout

Define OSCCAL_1K 1 ' Calibrate internal oscillator

CONF Var GPIO.1
ENAB Var GPIO.2
LED Var GPIO.0
SI Var GPIO.4
SO Var GPIO.5

B0 var byte


ANSEL = 0 ' Set all digital
CMCON = 7 ' Analog comparators off

HIGH CONF
b0=0

mainloop:

Serin SI,N9600,B0
WRITE B0,B0

Goto mainloop

End

What is wrong with my code?