Naija Gist - Latest: Joshua Seluese Okojie leads global study on eco-labels and consumer choice: A call for smarter sustainability
Joshua Seluese Okojie leads global study on eco-labels and consumer choice: A call for smarter sustainability
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Are Study.com courses and credit by exam courses transferable to my college? What are Study.com's exam policies for college credit courses? Can taking Study.com online college courses impact becoming a CPA? What score is needed to pass a Study.com online college course? What colleges accept Study.com online college credits?
The formal standard that later became mainstream was EIA 232 C, where EIA is the standard institute and C is revision. This one is sloppily referred to as RS-232-C, since RS-232 is such a well-known name.
I generally tend to keep signal grounds and power grounds separate because power ground carries the return current, therefore it can be "fluctuating" which sometimes can lead to communication errors. I'm not sure if this can be the case for a relatively slow and high-amplitude communication such as RS-232.
RS-232 is intended for box-to-box cabling in noisy environments (such as TTY to modem). To make it robust it supports much higher voltage levels (+/-12V) than the 3.3V/5V 'logic' levels used by microcontrollers.
From the parts (complementary BJT transistors and discretes near the connector) I think it's a non-standard RS-232 port that idles at 0V rather than -9 or whatever.