![]() RS232 supports baud rates from 110 to 230400. It is the number of binary bits transferred per second. The advantage of the single-ended technique is, it requires fewer wires to transmit information. Single-ended signals are affected by the noise induced by differences in ground voltages of the driver and receiver circuits. This means one wire transmits an altering voltage and another wire is connected to ground. The RS232 devices work on single-ended signaling (two wire). The impedance bridging between RS232 driver and the receiver is defined to maximize the voltage transfer between the transmitter and receiver. Normally, the maximum slew rate allowed is 30V/µsec. The RS232 standard maintains a minimum slew rate with slow rise and fall time to reduce the cross-talk between neighbouring signals. The change of input voltage determines the rate at which the RS232 driver responds. ![]() The voltage from -3V to +3V is considered as an indeterminate state. Whereas the control voltage signals use negative logic, i.e., logic ‘1’ indicates -3 to -25 volts and logic ‘0’ indicates +3V to +25V. The signal voltage between +3V to +25V represents logic ‘1’ and the signal voltages between -3V to -25V represents logic ‘0’.
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