Compatible, so you need to use level conversion circuit to connect with TTL circuit. 2. 5. The inteational standard of RS-485 does not stipulate the standard of RS485 interface connector, so you can use terminal blocks or DB-9, DB-25 connectors. Because the RS-485 interface has good anti-noise interference, long transmission distance and multi-station capability, the above advantages make it the preferred serial interface. What are the characteristics of RS-485 compared to RS-232-C interface? Answer: Since the RS-232 interface standard appeared earlier, it is inevitable that there are shortcomings, mainly as follows: (1) The signal level of the interface is high, which is easy to damage the chip of the interface circuit, and because the level is different from TTL level.2Kbps.
The RS-485 interface allows the connection of up to 128 transceivers on the bus, that is, the RS-485 has multiple Machine communication capability, so that users can use a single RS-485 interface to easily establish a device network. (2) The transmission rate is low.5PF/M, and the terminal load resistance is 100 ohms. The Boss RS-485 interface is a de facto industry standard. This length data is mainly limited by the influence of signal distortion and noise.
When the data signal rate drops below 90Kbit/S, assuming the maximum allowable signal loss is 6dBV, the cable length is limited to 1200M. Now due to the new UART chip 16C550, the baud rate reaches 115. The condition is that RS-422 must be able to support multi-machine communication.NO.51mm), the bypass capacitance between the lines is 52. Among them, about 99% of users work in the range of 10-20% symbol distortion, so the maximum distance in actual use will be far more than 50 feet.
Can the Waterproof Connectors Manufacturers be shorted as RS-485 A, and the Z-B of RS-422 can be shorted as RS-485 B? Answer: Not necessarily. The highest data transmission rate of RS-485 is 10Mbps. The main difference is: RS-422 has 4 signal lines: two sending (Y, Z) and two receiving (A, B). RS-485 has 2 signal lines: A and B for both sending and receiving