First of all we see that the speed of the differential interfaces RS422 and RS485 is far superior to the single ended versions RS232 and RS423. Noise is easily picked up and limits both the maximum distance and communication speed. Therefore RS485 can overcome the practical communication speed limit of RS232. RS485 uses the same DB9 connector used in the RS232 protocol. Therefore it is not needed to have delays between the data packets on the RS485 bus. RS485 can have a cable length of up to 1200 meters(data rate is limited to 100kbps), useful for connecting distant devices. Interoperability of even similar devices from different manufacturers is not assured by compliance with the signal levels alone. We are flexible to use even strips as connectors. However, the connections to the pins are different since it require positive and negative pins for transmission and reception. What are the data transmission rates in serial communication protocols? The main difference between these two protocols is that RS485 is designed to transmit data over long distances, while RS232 is designed for short-distance communication.

What is the difference between RS485 and RS232? With RS485 communication distances of 1200 m are possible. Although total cable length maybe shorter in a star configuration, adequate termination is not possible anymore and signal quality may degrade significantly. A: To prevent signal reflections in RS485 networks, it is essential to use termination resistors at both ends of the communication line. For higher speeds and longer lines, the termination resistances are necessary on both ends of the line to eliminate reflections. RS485 uses a balanced and differential signal, which means that it can be transmitted over twisted pair cables without the need for a separate ground line. RS485 is a type of serial communication protocol that allows for long-distance data transmission. Control and monitoring systems: A single pair of rs485 signal cable can connect up to 32 devices, with a signal transmission distance of up to 1200m. Therefore, using rs485 cables is an ideal choice for industrial control and monitoring systems, especially those with large-scale and high dispersion. Up to 32 devices can be connected to the communication network of RS485 standard.12. The equipment located along a set of RS-485 wires are interchangeably called nodes, stations or devices. In addition, the braided layer consisting of many small, tinned copper wires acts to counteract low-frequency interference.

RS485 and RS422 interfaces use differential signaling, which means that they require two wires to transmit data. RS485 and RS422 are widely used in industrial control systems. Twisted pairs in RS485 communication however adds immunity which is a much better way to fight noise. But, RS485 provides a better data rate. With RS485 on the contrary there is no such thing as a common zero as a signal reference. The transmitter and receiver compare the voltages of the data- and handshake lines with one common zero line. Depending of the information in the sent data, what is rs485 cable zero or more nodes on the line respond to the master. This ensures that all security-related information and incidents are transmitted quickly and with high reliability. In this situation, bandwidth can be used for almost 100%. There are other implementations of RS485 networks where every node can start a data session on its own. Digital communications networks implementing the standard can be used effectively over long distances and in electrically noisy environments.

RS485 is primarily a serial communication standard introduced in 1998 by the Electronic Industries Association (EIA). Several volts difference in the ground level of the RS485 transmitter and receiver does not cause any problems. This works well and prevents the existence of ground loops, a common source of communication problems. One of the main problems with RS232 is the lack of immunity for noise on the signal lines. RS485 can handle multiple devices on a single communication line, while RS232 can only handle two devices. In order to increase the extent of the Modbus network, repeaters can be used; and signal amplifying and regenerating devices provided with two communication ports that transfer to each what they receive from the other. The slave devices are connected to the master device, and they respond to the master’s requests for data. But some of the other interfaces are certainly interesting because they can be used in situations where RS232 is not appropriate.