On Dec 30, 2:16 pm, David Woolley <[email protected]> wrote: > > Yes, and 0 V lies right in the middle of that, and teh behaviour is apt to > > be undefined. > > The behaviour for RS232 control lines is not undefined. O volts is > unequivocally OFF. In practice, the same receivers are used for data lines. > > The significance of the transition region is that drivers have to be > monotonic in that range. It's not a requirement on receivers.
"Voltage levels Diagrammatic oscilloscope trace of voltage levels for an uppercase ASCII "K" character (0x4b) with 1 start bit, 8 data bits, 1 stop bit The RS-232 standard defines the voltage levels that correspond to logical one and logical zero levels. Valid signals are plus or minus 3 to 15 volts. The range near zero volts is not a valid RS-232 level; " Wikipedia. I thought it was plus or minus 3-12 volts with the range between -3 and +3 volts undefined. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
