The RS-232 is a serial communication protocol, commonly used for transferring and receiving the serial data between two devices. It supports both synchronous and asynchronous data transmissions. Many devices in the industrial environment are still using RS-232 communication cable. RS-232 cable is used to identify the difference of two signal levels between logic 1 and logic 0. The logic 1 is represented by the -12V and logic 0 is represented the 12V. The RS-232 cable works at different baud rates like 9600 bits/s, 2400 bits/s, 4800 bits/s etc. The RS-232 cable has two terminal devices namely Data Terminal Equipment and Data Communication Equipment. Both devices will send and receives the signals. The data terminal equipment is a computer terminal and data communication Equipment is modems or controllers etc.
| Specifications | RS-232 |
| Mode of operation | Single ended |
| Number of drivers/receivers on one line | 1 driver, 1 receiver |
| Maximum cable length | 15 m |
| Maximum date range | 460 kbps |
| Max. Driver output voltage | +/- 25 V |
| Max. Driver current in high impedance state | +/-6mA at +/-2V |
| Slew rate (max) | 30 V/µS |
| Receiver input voltage range | +/- 15V |
| Receiver input sensitivity | +/-3V |
| Driver load impedance | 3K to 7K Ohms |
| Receiver Input Resistance | 3K to 7K Ohms |
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