Termination: Proper network termination is vital to avoid signal reflections, which can lead to communication errors.Biasing: Biasing is beneficial for maintaining signal quality over long distances. Termination resistors also reduce electrical noise sensitivity due to the lower impedance, and bias resistors are required. It should be judged according to the model of the chip in the 485 converter and the model of the 485 device chip, and the load capacity can only be determined according to the chip with a lower index. Generally, there are three levels of 485 chip load capacity-32 units, 128 units and 256 units. The specifications of the shielded twisted pair used are related to the distance of the 485 communication line and the number of connected devices, as shown in the following table. Before debugging, make sure that the wiring of the equipment is correct and the construction conforms to the specifications. For the actual value, please refer to the wire specifications.

2. It is not allowed to use a network cable with a wire diameter that is too thin, which will reduce the transmission distance and reduce the equipment that can be connected. The condition is that the communication wire is high-quality and meets the standard, the baud rate is 9600, and only one 485 device is loaded, so that the communication distance can reach 1200 meters, so the actual and stable communication distance of the 485 bus is usually less than 1200 meters. According to the 485 bus structure theory, under the premise of an ideal environment, the 485 bus transmission distance can reach 1200 meters. What is the RS485 bus? That is to say, the maximum transmission distance of RS485 can reach 9.6 kilometers in theory. The transmission distance of multimode fiber is 5-10 kilometers, while the transmission distance of single-mode fiber can be up to 50 kilometers. If long-distance transmission is really needed, optical fiber can be used as the propagation medium, and a photoelectric converter is added at both ends of the transceiver.

● The manufacturer will do a lot of testing work for its supporting 485 converter, and will require the 485 converter manufacturer to carry out production and quality testing according to its fixed performance parameters, so it has better compatibility with access control equipment. You should also be aware that RS485 is a multidrop communication protocal meaning that each node on the RS485 side of the converter has an address. RS485 transmits binary signals by generating high and low voltages, representing binary 0s and 1s (on and off), enabling efficient long-distance communication in electronically noisy environments. Industrial sites often need to collect multi-point data, analog signals or switch signals. It transmits signals through the voltage difference between the two communication lines, so it is called differential voltage transmission. 1) What kind of communication line should be used for 485 bus? 5) Is there a connection point from device to device on the 485 bus? Nowadays, the two-wire connection method is mostly used. RS485 has two-wire and four-wire connections.

The four-wire system can only realize point-to-point communication, which is rarely used now. In the central chemical dosing and dispensing system of China's Hingsen Semiconductor, the configuration comprises central chemical storage tanks coupled with dispensing systems at each process point, controlled through valve boxes to regulate the supply of chemical reagents. So take advantage of that and let your systems MCUs implement heart beat handshaking directly though the RS485 communications layer using appropriately designed small packets. RS-485 serves as a physical layer for the AES3 digital audio interconnect. When in use, it is recommended that both ends of the armor layer be grounded and the innermost shielding end is grounded. So in your typical office building, you're probably running hundreds of feet if not thousands of feet just from one end of the building to the next. If you ever wanted to connect to device in the same building (e.g. to machinery on production hal) and to you have to go to it to connect your computer.

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