Re^2: (OT) How to read a 2-Wire RS-232-C line?

RS-232 was never +/-25 V. IIRC the standard specifies +/-3V to +/-15V with +/-12V being typical.

Many systems generate a quasi RS-232 output (OP's device is likely to be of that sort) using 0V and 5V for their signaling levels. Most RS-232 receivers will work fine with those levels.

DWIM is Perl's answer to Gödel

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