a good learning scada hmi system

[sparks32]

hi there,
I'm looking for a little or no cost way of making a xp based hmi and scada system, I have a T100MD using rs232 port and a usb/serial adapter than doesn't support any operating system above xp.
t100md supports modbus/RTU. i did muck out with the visual basic advanced hmi for Allen Bradly as seen on you tube http://www.youtube.com/watch?v=CiPzqc5jDlE . i tried to find a RTU driver to use instead of the ab df1 drive with no success. lots of software out there ranging from expensive to a second morage on a house. with no idea how well it would all work anyway. i just want to find something good to learn on and maybe be ideal for budget small projects. any suggestions would be appreciated. thanks

[support]

We have a customer who did a software HMI on PC running C# programming language and he uses a Modbus library from:

http://code.google.com/p/nmodbus/

You may be able to use it or follow the example to create the driver in Visual Basic.

You can also send and receive commands to the PLC use the PLC's hostlink command protocol. Some examples in Visual Basic can be downloaded from:

http://www.tri-plc.com/applications/VBsample.htm