Thanks for the quick replies all, what i had hoped to do is to recreate what the Keysight "Interactive IO" does where sending a command resets the instrument to Power on conditions i.e. forcing a Self Test etc.
*RST, RE, IN etc dont seem to be doing anything at all. According to the "advanced programming" sections of both User and Service manuals (D/L direct from Keysight this week) it says about Local, Remote, Local Lockout etc but doesnt mention any mnemonics etc, just the exact string.
I have read through the HPIB tutorial in the files section here which says about the mnemonics like LLO, REM, GET etc but trying them this morning they have not worked either.
I am using the Keysight IVI.VISA resources in Visual Studio, i essentially build a string and then write that to the USB>GPIB adapter (Keysight 82357A). doing this so far i have written my VB.net form so that i can select different functions etc and build up an entire string, such as F1RAN5T1Z1D1 and send it to the 3478A. Using Keysight IO monitor, you can "sniff" the GPIB bus and doing this i have verified that it is sending the string i have created, e.g F1RAN5T1Z1D1/n .This example would set it as DCV, Auto Range, 5 digits, Internal Trigger, Auto Zero "ON" and D1 returns it to the normal display. So this part all works, and i can switch between the measurement functions and ranges with no issue.? I can read back the status bytes too, reading the error register etc.
However i still cannot get the "generic" HPIB commands to actually work.
With my instruments which only have RS-232. I always obtain remote control of the instrument, and then immediately do a reset/self test command if possible, to check the instrument is working, initialises ok, and then carry on with any controls afterwards. So i am hoping to do the same with my GPIB devices. I thought i would start with my 3478A as its one of the more simpler devices. I also have a Keithley 213 which can only be triggered by GPIB to enable its output so that was going to be my next step after this as the 3478A is more "visible" when you have correct control over the instrument.
