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Tektronix TDS754C not communicating over GPIB in unprotected mode

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Tantratron:

--- Quote from: amaschas on December 06, 2024, 12:30:07 am ---This was the key thing I was missing, thank you so much! I had 3 different GPIB adapters including the NI one, and but the fact that tektool didn't work with the other two I had convinced me that the issue was with the scope, and the fact that the scope didn't respond to *IDN? in unlocked mode seemed to confirm that

--- End quote ---
Besides the superb NI adapter which works cross-platform (Windows, Linux and macOS), some members reported the tekfwtools to work fine with Agilent 82357B GPIB adapter. I do not have one because the Agilent is not macOS compatible plus the NI model (if made in Hungary) is really awesome so I did purchase few of these in stock.

amaschas:

--- Quote from: TERRA Operative on December 06, 2024, 03:49:38 am ---Send: PASSWORD PITBULL

Not: PASSWORD "PITBULL"

--- End quote ---

This is what I'm trying with the NI adapter with unlock option 1M:





I've tried both the "query" and "write" buttons with the commands, and I've tried it a few times, but 1M remains stubbornly locked. I get that timeout with pretty much any command I try, though of course tektool works so there must be some commands that do function in this mode.

Interesting, I see this little block of code in tektool:


--- Code: ---/* Only needed in normal running mode, not needed when running in bootloader mode
   (with scope booted with NVRAM Protection rocker switch in Unprotected position) */
/* send first TEKTRONIX Password fr TDS5xxB/7xxA models to allow memory dump */
  //ibwrt (Dev, "PASSWORD PITBULL", 17L);
ibwrt (Dev, "PASSWORD PITBULL", 16L);
--- End code ---

I'm not sure if this just applies to the commented line, or to the password command in general?

TERRA Operative:
I let the scope boot normally, then flip the protection switch and then send the unlock commands.
Then flick the switch back to its normal position and reboot.

amaschas:

--- Quote from: TERRA Operative on December 08, 2024, 06:54:38 am ---I let the scope boot normally, then flip the protection switch and then send the unlock commands.
Then flick the switch back to its normal position and reboot.

--- End quote ---

That did it! specifically used the write command rather than the query command, and when I booted back up 1M was enabled. Thanks so much for all your help!

TERRA Operative:
Nice.

Also, you can activate options 2C and 2F without having to add any additional hardware if they are not already acivated.

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