hi,

[malay]

how to measure voltage from oscilloscope (Tektronix TDS 210) through serial port (RS232) via visual basic.

[Randy Solomonson]

Unfortunately, we do not have drivers for the TDS-210 in Visual Basic. However, if you have LabVIEW or CVI, we do have drivers available on our website at:
http://zone.ni.com/idnet97.nsf/browse/

[Kamran S.]

You should be able to make use of the LabWindows/CVI instrument driver through Visual Basic. There is ab instrument driver for the 210 at:
http://zone.ni.com/idnet97.nsf/9b2b33e1993d877786256436006ec498/3b94fa5a6b9a6a93862568ab005fbc67?OpenDocument

You may want to refer to the .c source file for the fucntions provided in the driver.

The following document illustrates how you can convert a LabWindows/CVI example for use in Visual Basic ... you will need Measurement Studio to make use of the driver.
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/2b42270eac4a109c862569ae006253c1?OpenDocument

You could send commands (by referring to the instrument's manual) directly to the instrument using the Tools for Visual Basic in Measurement Stuido or use the
instrument driver.

Best of luck,
Kamran - NI