i have computer_A connected via GPIB to an instrument to read/write SCPI.
Now i want to use computer_B that is connected also to the GPIB-Bus to only log all messages that are sent over the bus of computer_A and instrument.
How can this be done using Labview?
So you basically want a GPIB "sniffer"
I believe NI has that functionality built in to GPIB+ cards using NI-GPIB Analyzer software
Yes, i need a sniffer like Wireshark for LAN.
Unfortunally i dont have a + card.
How can i do this with a "normal" GPIB interface?
I dont need the funcionality of the analyzer software.
I guess it depends on what you are trying to capture. If you are trying to reverse engineer another piece of software then you are going to need a GPIB interface that supports sniffing. Because although all the data is on the bus a proper GPIB device ignores everything not addressed to it (with a few exceptions). Even when a GPIB device is designated a "Listener" it only "listens" to data sent to its GPIB address.
If it's another LabVIEW program you are trying to sniff (like for errors) NI I/O Trace (used to be called NI-Spy) might be all you need.
I need to see the scpi commands that are sent from the other PC which has no Windows and no Max, no io-trace, no whatever installed.
The running program there has no sourcecode anymore.