PowerAnt can be programmed using standard component mscomm32.ocx. This component is created in Microsoft company but not included in any version of MS Windows. May be the reason of this is some errors. (Officially known bug: Memory leak in open/close of RS-232 port). Typically RS-232 port is open at start of the program and close at the end of program. It's make this bug is not so dangerous.
Download mscomm32.ocx (mscomm.zip, 51KB) unzip component and copy it to folder C:\Windows\System.
To tweak this component you must put some keys to MS Windows registry (In the Windows world we do not like easy ways;-)):
REGEDIT4 [HKEY_CLASSES_ROOT\Licenses\4250E830-6AC2-11cf-8ADB-00AA00C00905] @ = "kjljvjjjoquqmjjjvpqqkqmqykypoqjquoun"To do that - just double click in file mscomm.reg (stored into archive mscomm.zip). The RegEdit ask you - would you like to make some changes with System Registry? Your right answer is "Yes".
Run MS Excel. Open the Visual Basic toolbar (View/Tools/Visual Basic) and "Controls" toolbar (View/Tools/Controls). Switch to constructor mode (using Visual Basic toolbar). Create the CommandButton1 button. Push right mouse button on CommandButton1 and choice menu item "Source code". The Microsoft Visual Basic editor is opens.
Right this you need to do somesing magical in Microsoft Visual Basic editor. Open menu Tools/References. In window push the button Browse.... Find in filesystem mscomm32.ocx (folder C:\Windows\System). In the window "References" in pane "Available References" you can see checked string "Microsoft Comm Control 6.0".
Copy the followed program source in to editor:
Dim PwrAntComm As New MSComm ' When the button is pressed, the command 08?? is executed ' the device answer puts to cell C12 Private Sub CommandButton1_Click() ' 2 - COM port number (COM1 = 1, COM2 = 2, ... ) PwrAntOpen (2) ' Ask device with address 08 "Who are you, and what you can do?" ' Put device answer to cell C12 Sheet1.[C12] = PwrAntCmd("08", "??") Call PwrAntClose End Sub ' Open RS-232 port, if this port is not be opened ' PortNumber - Number of COM port (COM1 = 1, COM2 = 2, ... ) Sub PwrAntOpen(PortNumber As Integer) If Not PwrAntComm.PortOpen = True Then PwrAntComm.CommPort = PortNumber PwrAntComm.Settings = "9600,N,8,1" PwrAntComm.Handshaking = comNone PwrAntComm.InputLen = 0 PwrAntComm.InBufferSize = 40 PwrAntComm.OutBufferSize = 40 PwrAntComm.PortOpen = True PwrAntComm.RThreshold = 0 PwrAntComm.Output = Chr(27) ' Clear the receive buffer in all devices End If End Sub ' Close RS-232 port, if this port be opened Sub PwrAntClose() If PwrAntComm.PortOpen = True Then PwrAntComm.PortOpen = False End If End Sub ' This function execute the given command and return the device answer. ' If something wrong (you talk with nonexisting device) then ' function is return the empty string. Maximum command execution ' time is limited to 2 sec. Function PwrAntCmd(AntName As String, AntCmd As String) As String Dim AntInStr As String Dim TimeOut As Date ' Send command to device PwrAntComm.Output = AntName & AntCmd & Chr(13) ' Read string by bytes from device and wait byte with code 0x0D AntInStr = "" TimeOut = Time Do dummy = DoEvents() ' Let system do something, we do not need freeze the system If PwrAntComm.InBufferCount > 0 Then AntInStr = AntInStr & PwrAntComm.Input End If Loop Until (Right(AntInStr, 1) = Chr(13)) Or (Time - TimeOut > 1) ' Remove 0x0D at the end of string AntInStr = Left(AntInStr, Len(AntInStr) - 1) PwrAntCmd = AntInStr End Function
Save the program and close the Visual Basic editor
Turn off the constructor mode (in Visual Basic tool bar).
If you push the button, the command 08?? is executed, and device answer is putted to cell C12.
Pay attention, when you push the button, program open and close RS-232 port and some small memory leak may be happens.