Voltage
Question 1 |
The voltage ranges for a logic high and a logic low in RS-232 C standard is
Low is 0.0V to 1.8V, High is 2.0V to 5.0V | |
Low is -15.0V to -3.0V, High is 3.0V to 15.0V | |
Low is 3.0V to 15.0V, High is -3.0V to -15.0V | |
Low is 2.0V to 5.0V, High is 0.0V to 1.8V |
Question 1 Explanation:
According to the RS-232 standard, valid signals are either in the range of +3 volts to +15 volts or -3 volts to -15 volts with respect to the ground/common pin. Consequently, the range between -3 volts and +3 volts is not a valid RS-232 signal level.
The standard also specifies a maximum open-circuit voltage of 25 volts, which means that RS-232 drivers and receivers must be able to withstand any voltage level up to +/-25 volts.
The standard also specifies a maximum open-circuit voltage of 25 volts, which means that RS-232 drivers and receivers must be able to withstand any voltage level up to +/-25 volts.
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