Hello,

I basically understand rs232 voltage levels but there remains one
ambiguity.  If voltages in the range of +-3 volts are undefined, are
signals that fluctuate from -10 to +0.18 volts safely ignored?  I have a
circuit that uses the idle receive current to feed the negative transmit
level.  Yes, I can store the charge in a capacitor but I want to be
cheap.  The result of eliminating the cap is the incomming rs232 signal
is echoed out but at levels of -10 to +0.18 and it seems to work.  But
will it work *all* the time?  Is this within specs?

Regards,
David Koski

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