Introduction:RS-232 and RS-485 are both industrial serial data interface standards, initially formulated and published by the Electronic Industries Alliance (EIA), with RS-232 released in 1962, named EIA-232-E, as an industrial standard to ensure compatibility between products from different manufacturers. To expand its application range, EIA also established the RS-485 standard in 1983, adding multipoint, bidirectional communication capabilities, allowing multiple transmitters to connect to the same bus while enhancing transmitter driving capacity and collision protection features, thus expanding the common mode range of the bus, later renamed TIA/EIA-485-A standard.
Summary:
1. In terms of wiring, RS232 is a three-wire system, while RS485 is a two-wire system;
2. In terms of transmission distance, RS232 can only transmit up to 15 meters, while RS485 can transmit up to 1200 meters;
3. In terms of speed, RS232 supports full-duplex transmission, while RS485 supports half-duplex transmission;
4. In terms of protocol layer, RS232 only supports point-to-point communication (1:1), while RS485 supports bus-type communication (1:N);
Source: Daily Industrial Control, infringement deleted
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