FAQ: TWedge

1. Install the Windows Resource Toolkit. You can download it from Microsoft's Website.
2. Open the Command Line (Start -> Run -> “cmd”), go to the installation directory of the Windows Resource Toolkit and enter the following command:
   Instsrv TWedge "C:\Program Files (x86)\Windows Resource Kits\Tools\srvany.exe".
   
3. Open the registry editor (Start -> Run -> “regedit”) and look for the following registry key:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TWedge.
   
4. Now add a "Parameters" key with a value called "Application". It contains the path to the executable of TWedge (default: C:\Program Files (x86)\TEC-IT\TWedge2\Bin\TWedge.exe C:\TWedge.twi). The twedge.twi file opens TWedge with the predefined settings!

5. Open the properties of the new TWedge service which you can find in the Control Panel -> Administrative Tools -> Services.
6. Go to the “Log On” tab and make assure that the checkbox “Allow service to Interact with desktop” is activated.
   
7. Run the TWedge service.

How can I send data to my Device?

Solution: TWedge provides the function WriteToDevice () for this purpose. WriteToDevice () accepts two parameters:

• The first one specifies the data which should be sent to the device.
• The second parameter specifies the timeout (in milliseconds) for this operation.

The following example sends two lines of text: The first line prompts the device for accepting the username, the second line sends the username. Each line is terminated by a newline character (\n line feed):

WriteToDevice ("user\n", 1000);
WriteToDevice ("sysadmin\n", 1000);

Why are all commands ignored by the device?

Solution: When using the function WriteToDevice () to send device configuration or initiation commands, please check if a newline or carriage return character is required. This is especially important if the device uses a protocol like TELNET. A newline character is specified by \n.

The following example sends the text "user" followed by a newline to the device:

WriteToDevice ("user\n", 1000);

Here is a list of common escape sequences:

• \' Single quotation mark.
• \" Double quotation mark. Use this escape sequence if you need to specify a " as part of a string.
• \\ A single backslash character.
• \b Backspace.
• \n New-line (line-feed).
• \r Carriage return. \r in combination with \n is used in DOS systems as sequence for a carriage return and new line. Most likely \n can be used instead.
• \t Horizontal tab.
• \f Form feed (for printers).