Common digital electronics do not support the true ±25V. Most electronics are much lower voltages like 2.7V to 6V. They must use transceivers to convert from the low TTL levels (transistor transistor logic) that microprocessor are capable of to the higher voltages required by a true RS232 device. | Common digital electronics do not support the true ±25V. Most electronics are much lower voltages like 2.7V to 6V. They must use transceivers to convert from the low TTL levels (transistor transistor logic) that microprocessor are capable of to the higher voltages required by a true RS232 device. |