huh, i didn't know they could be connected like that! i only knew of the -12V as a source for RS-232. thank you for the tip; i'll investigate this (i assume you're correct, just want to understand it for myself) and update the page. thank you very much!
> huh, i didn't know they could be connected like that!
'Ground' is not necessarily 0V, it is just convenient to use it like that. If 'ground' is 0V then 12V - 0V = 12V, but if you make 'ground' -12V then that is 12V - (-12V) = 24V.
