Hi Emma,
Thank you so much for your suggestion! I checked the firmware version of my MSO58, and it was quite old (Ver 1.2). After updating it to Ver 1.44, I am now receiving the correct responses from the MSO58 for the afg:output:mode? and afg:ccount? query commands. Your advice was incredibly helpful and resolved the issue.
Thanks again for your assistance!
Best regards,
Minho