Getting undocumented platform, product, and capabilities returned when issuing ESC STX ? command in Accuterm

I’m issuing the ESC STX ? command in two different places and am getting some results that don’t seem to be documented in the Accuterm user manual.  When I issue it from Accuterm on my PC I get the character “$” in the capabilities string that isn’t defined in the manual.  When I issue it from a webpage using Accuterm IO, I get 30 for a platform and 11 for a product.  Is there some newer documentation that I”m not aware of?