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Several volts difference in the ground level of the RS485 transmitter and receiver does not cause any problems. Electric noise can cause all kinds of problems for electronics. Without termination resistors, signal reflections off the unterminated end of the cable can cause data corruption. This allowed for electrical noise to cause interference. The magnetic fields are allowed to pass, but do no harm. RS-485 signals are used in a wide range of computer and automation systems. RS232 is also used for laboratory automation surveying. RS232 original purpose is to interconnect a terminal with a modem. RS232 is an interface to connect one DTE, data terminal equipment to one DCE, data communication equipment at a maximum speed of 20 kbps with a maximum cable length of 50 feet. You can also still simply use a terminal strip. This is due to USBs’ advantages of being faster, having lower voltages, and having connectors that are simple to connect and use.

Devices (Device 1, Device 2, Device N) are connected in series, forming a daisy chain topology. The characteristic feature of the Daisy Chain topology is the sequential connection of each device along a single line, not forming a loop structure. The entire daisy chain network is ultimately connected to a PLC (Programmable Logic Controller), facilitating data exchange between multiple devices and the central control system. RS485 is however most popularly used in programmable logic controllers and factory floors where there what is rs485 cable (Source) lots of electrical noise. These are used in programmable logic controllers and on factory floors. In contrast to RS-422, which has a driver circuit which cannot be switched off, RS-485 drivers use three-state logic allowing individual transmitters to be deactivated. This section also defines the logic states 1 (off) and 0 (on), by the polarity between A and B terminals. It also defines three generator interface points (signal lines); A, B and C. The data is transmitted on A and B. C is a ground reference. Rs485 cable is essentially a signal cable with a twisted pair structure, additionally shielded with 2 layers of noise protection used in industrial communication. Anti-inteference layer: Rs485 cables are designed with 2 anti-inteference layers to shield the internal conductors.

Alarm systems: Rs485 cables in alarm systems help transfer alarm signals and information from alarm devices to the control center. With your RS485 network, you can remotely monitor and control that pump from a control center. Access control systems: Rs485 cables are mainly used to connect and transmit data between access control devices such as security gates, RFID cards, or time attendance machines and the control center. Stable connections play a crucial role in managing and controlling access to secure areas, optimizing system performance. RS485 is also used in performance venues to control lights and systems such as the one shown below. This allowed users in manufacturing facilities to connect larger applications and whole machines with one protocol. For instance, consider devices A and B. During a specific timeframe, data transmission is allowed from A to B, and once completed, data transmission from B to A can take place. This configuration facilitates efficient data transmission between devices while reducing the risk of signal distortion. Interoperability of even similar devices from different manufacturers is not assured by compliance with the signal levels alone. Most manufacturers still utilize a DB-9 connector. These manufacturers all agree on the meaning of the standard, and their practice is in widespread use.

It is generally recommended to use a 24AWG twisted pair cable with grounded shielding. The left side of the image shows the structure of the twisted pair cable, including copper wire, shielding, and insulation. Rs485 cables not only vary in the structure of the core but also in the number of twisted pairs. This cable structure helps maintain stable data transmission in electrically noisy environments. The two-wire half-duplex system enables bidirectional data transmission between two devices, but not simultaneously. While four-wire full-duplex exists, it is less prevalent in current applications, with the two-wire half-duplex configuration being the predominant wiring method in use today. If the 8-core cable shipped with the device is used for RS485 communication, please trim the length and try to use a short wire to reduce noise interference. Connect the shielding net to the main communication wire shielding and then ground it. 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. In the straight cable, all noise current is flowing in the same direction, practically generating a looping current just like in an ordinary transformer.

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