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visa com readIEEEblock with 8720

Question asked by DavidC on Jun 10, 2011
Latest reply on Jun 10, 2011 by Dr_joel
Good afternoon

I am trying to read trace data off a 8722C with Excel by VBA using visa com formatted IO. But my attempts to read back result in a "Automation failure catastrophic error" message. 
My code is
vna.writestring ("form3")
vna.readieeeblock (BinaryType_R8)

using i can retrieve the byte data for the block  and header appears to be returned correctly along with block data, but was hoping to avoid the parsing of block data.