send data from pc(Visual Basic) to pic16f877a through serial port(DB9)

[texas5]

here's the code for micro controller:

PinNumber var byte
PinState var byte

Main:

' Use the programming port to receive
' data at 2400 baud
' Wait for the synch byte (255) and then
' get the PinNumber and PinState
Serin 16,16780,[WAIT(255),PinNumber,PinState]

' If PinState=0 Then go to GoLow
' otherwise go to GoHigh
Branch PinState,[GoLow,GoHigh]
Goto Main


' Set The pin low
GoLow:
LOW PinNumber
Goto Main


' Set the pin high
GoHigh:
HIGH PinNumber
Goto Main
END

i have problem when compile it....the 'Serin 16,16780,[WAIT(255),PinNumber,PinState]' appear as bad expression...why is it???