Serial Communications: A C++ Developers Guide:
"To assure successful transmission, RS-232 signals must product outputs that range from +5 to +15 volts for a poitive signal, and =5 to -15 volts for a negative signal. A valid input for an RS-232 receive is defined as +3 volts or greater for a valid 1, and -3 volts or less for a valid 0."
Given this is what I've used programming serial ports for over 10 years, though not all that time in C++, I'll stick with it.
That was the reference set we always used at Datastorm, who wrote Procomm Plus originally. And for some reason, it always worked with serial port modems.
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