How to know the GPIB commands for an instrument without seller information

[JEmmanuelH]

This is the situation...

I have an intrument to generate tests for EMC, I control it manually and with a PC application.

What I need to do is proggramming a new application to control it but I don´t even know the commands that the actual application sends to the instrument. I read all the available seller manuals but there is no information about these commands. Is there another way to know these commands?

PD: As you realised I´m new at this forum

[nyc_(is_out_of_here)]

see if https://forums.ni.com/t5/LabVIEW/gpib-sniffer/td-p/2564175  sheds any light

[crossrulz · Accepted solution]

Correction to the link: https://forums.ni.com/t5/LabVIEW/gpib-sniffer/td-p/2564175