The RS232 level converter is converting the TTL to RS232 levels depending upon the capacitors charge..
I want to know how to calculate the capacitor value for the RS232 to get the RS232 voltage levels.
In some cases RS232 voltage levels are +/-3 to +/- 25, in some cases some say +/-3 to +/- 15...
which is the correct voltage level....
And tell me how to calculate the capacitor value for achieving those higher voltages.
thankyou so much...
can u tell me what voltage levels are used inside our PC ?
our microcontroller is using TTL logic levels i.e. 0 - 5v. like wise how PC is using..