Try something like:
Code:
Distance VAR WORD
Sum VAR BYTE

Start:
  HSERIN 1000, NoData, [wait ($FF), Distance.BYTE1, Distance.BYTE0, SUM]
  ' Here you could evalute SUM to verify packet is correct but lets not do that now.  
   HSEROUT["Distance: ", DEC Distance, "mm", 13]
Goto Start


NoData:
  HSEROUT["No data from sensor", 13]
  Goto Start
/Henrik.