How do I read a marker position from HP8753C network analyzer?

[L_K]

I am trying to write a LabVIEW program that talks to HP8753C. I tried some commands (in the programming manual) to reading a marker position from HP8753, but it didn't work. I tried sending SELPTxx (xx=the number of point which is between 0 abd 200) and then OUTDATP then I used VISA read to read 48 bytes of data but it didn't work. Can anyone suggest me the correct way to read a marker data from HP8753C?

[AaronK]

Hi Irene,

Consider trying to use NI-SPY to see what you are actually sending and receiving. NI-SPY is a driver level debug utility that will allow you to see exactly what messages are being sent over the GPIB communication lines. The program is in the NI folder and simply select start capture to begin. Also double check your instrument manual to make sure that the device does not need to be set into some certain state or have certain commands that precede the SELPT command.

Hope this helps out!

Best Regards,
Aaron K.
Application Engineer
National Instruments