RS485, TTL and RS232 are serial communication protocols, the main difference between them lies in the transmission distance, transmission rate, signal level and communication mode.
1. Transmission distance: RS485 can achieve long-distance transmission, can reach thousands of metres. TTL and RS232 transmission distance is shorter, generally no more than a few dozen metres.
2. Transmission rate: RS485 and RS232 support higher transmission rates, can reach more than 10Mbps. TTL is usually used for low-speed data transmission, the highest rate of about 4Mbps.
3. Signal level: RS485 and RS232 are differential signal level, with better anti-jamming ability, while TTL is a single-ended signal level, anti-jamming ability is poor.
4. Communication mode: RS485 supports half-duplex and full-duplex communication mode, can achieve multi-point communication. RS232 only supports single-point communication mode. TTL is generally used for communication between the microcontroller and external devices, usually only point-to-point communication.
Overall, RS485 has advantages in transmission distance, transmission rate and anti-interference ability, etc. It is suitable for industrial automation and data acquisition and other occasions that require long-distance and high-speed transmission. While RS232 and TTL are suitable for short-distance low-speed transmission occasions, such as computer serial communication, microcontroller and sensor communication between the occasions.
Post time: Mar-26-2024
