I am trying to read binary trace data from RS spectrum analyser. I have had this working before with VisaNS.dll 13.0.45.167, but NI seem to have introduced changes that mean that my code no longer works.
I can use NI MAX to execute the commands manually and get the correct data from the spectrum analyser I am trying to use.
"FORM REAL,32"
"TRAC:DATA? TRACE1"
Read two bytes: #4
Read four bytes: 2004
Read 2005 bytes: ... correct data...
Using VB2013 the following command returns exception "The binary block header was not found in the input stream":
Dim byteData(2004) As Byte
Session.FormattedIO.ReadBufferSize = lngBytes + 1 - omitting this command makes no difference.
byteData = Session.FormattedIO.ReadBinaryBlockOfByte()
I know that the Session is good as it returns the #4 and 2004 that I get with NI MAX.
I have the following references:
- NationalInstruments.Visa.dll - 13.0.45.167
- Ivi.Visa.dll - 5.8.908.0
Any ideas would be gratefully received.
