Does Ivi_WriteInstrData work?

[GoBlue]

I know the answer is probably yes, but I can't get it to work at all.  I'm trying to communicate to an Agilent E4437B and I need to pass through some GPIB commands that I can't find in the IVI driver.  When I use the Ivi_WriteInstrData function I get an error that tells me the given session or object reference is invalid.  I have functions before it and after it that work fine, with the same session.  For example:

 status = Ivi_ValidateSession (instr_handle);  //  Returns a 0 indicating that it's a valid session
 
 status = IviRFSigGen_ConfigureRF (instr_handle, 1.0e6, -22.2);  //  Works

 status = Ivi_WriteInstrData (instr_handle, "*RST");  // returns error
 
 status = IviRFSigGen_ConfigureRF (instr_handle, 2.0e6, -22.2);   // Works

 status = agesg_WriteInstrData(instr_handle, "*RST");  // returns error
 

 status = agesg_ConfigureRF (instr_handle, 1e9, -33.3);  // Works
 
 IviRFSigGen_reset (instr_handle);  // Works
 

Does anyone have any ideas?

Thanks for your help.

[Makoto]

You are accessing the instrument through the RFSigGen class driver.  You can't pass the class driver's session handle (ViSession) directly to Ivi_WriteInstrData() and Ivi_ReadInstrData() functions, which require a "specific" session handle.  To aqcuire the specific session handle, you must use IviRFSigGen_GetSpecificDriverCHandle() function.

[GoBlue]

Thanks Makoto!!  Worked like a champ!