Serial Port / COM Port UDF

[thestormdragon]

Hi

I'm trying to use Martin's CommMG.au3 to send commands to my monitor (controlled via RS232) and to retrieve the result from the monitor.

I've got the "sending" part down pat but never seem to receive anything - here's the relevant code

                ;set the port settings
                $CMPort = "1"
                $CmBoBaud = "9600"
                $CmboDataBits = "8"
                $CmBoParity = "none"
                $CmBoStop = "1"

                ;convert the HEX string to its decimal equivalent
                $bBinData = Binary("0xA6010000000301AD08",8))
                $iNumbytes = BinaryLen($bBinData)
                $tBinData = DllStructCreate("byte["&$iNumbytes&"]")
                DllStructSetData($tBinData, 1, $bBinData)

                ;Open the port with the settings
                _CommSetPort($CMPort, $sportSetError, $CmBoBaud, $CmboDataBits, $CmBoParity, $CmBoStop, 0, 1, 1)

                ;send the converted data to the monitor
                $iRet = _CommSendByteArray(DllStructGetPtr($tBinData),$iNumbytes,1)

                ;msgbox(1,"1","----- " & BinaryToString(_CommReadByteArray()) & " -----")    <<<<<<-------- EDIT THIS LINE TO DISPLAY THE RECEIVED DATA

                If @error Or $iRet = -1 Then ConsoleWrite("!Error: " &  @error & @CRLF)

                _CommClearOutputBuffer()
                _CommClearInputBuffer()
                _CommCloseport()

The monitor is supposed to return 21 01 00 00 05 01 AD FD 04 70 

Does anyone have any ideas as how what that line should be?  I've looked on the forums / google and am obviously not doing the right thing 

Many thanks in advance

David