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It is important to implement remote control and other requirements where serial ports must be tightly connected with Ethernet or fiber optic communications. Since Ethernet belongs to the physical layer and the data link layer, the serial port of Ethernet is more precise. Serial port for data communication between MCU chips. By "isolating" sections of a large network, the accumulated noise on one isolated leg is not so likely to cause a data error that will propagate to another leg of the network. When the four-wire system is used, only point-to-multiple communication can be realized (that is, there can only be one master device, and the rest are slave devices). A circuit is a full definition of a signal from the transmitting device to the receiving device, but many now think of these definitions as pin labels. The four-wire system is rarely used now, and now the two-wire system is mostly used. There is still the issue of sorting out the message frame, which I guess is the bigger issue right now, however this magical box promises a very user friendly setup interface, so I'll see what transpires with the rep tomorrow.

If there's no reflection, your TML is terminated correctly (the resistor value is right). Two-way resistor termination: Works best on a linear bus, with transmitters anywhere along the bus. A conversation with a cable manufacturer can help to define the best available cable for your application. RS-422 is full duplex so it can use the X-On / X-Off protocol, if needed. Today, many devices use serial communication, especially in industrial automation and security monitoring projects. Similarly, the Profibus (Process Field Bus) protocol uses RS485’s popular physical medium when deploying fieldbus solutions in factory and process automation environments. At CO2Meter we regularly field questions about using the RS485 protocol. The RS485 standard allows the user to configure inexpensive local networks and multidrop communications links using twisted pair wire. RS-422 is inherently simplex on each pair of wires. This document is primarily directed at discussion of RS-485 but also includes information about RS-232 and RS-422.

The primary difference between RS-422 and RS-485 is that RS-485 requires two wires in a single pair which all devices transmitters and receivers are connected to, and RS-422 typically uses two or more pair in which only one transmitter and up to ten receivers are connected to a single pair. One is a TCP client and the other is a TCP server. A TCP client is a hitter, and a TCP server is a connector. The concepts of TCP client and TCP server can be analogized. 12 V (this is due to the fact that the pads of the microcircuits can be at a fairly decent distance from each other, more than one kilometer, and scatter relative to each other). 4.RS485 can connect up to 32 nodes on the same bus, which can realize real multi-point communication, but generally adopts the master-slave communication mode, that is, one master has multiple slaves.

RS485 serial port communication is very convenient for multi-point interconnection, and many signal lines can be saved. From serial port to network port and from network port to serial port, because these products can convert both ways, it is actually the same. 3.The two-wire RS485 can only work in a semi-duplex mode, and the sending and receiving cannot be carried out at the same time. Multiple Drivers, Multiple Receivers: RS-485 standard supports multiple drivers and receivers on the same communication bus. The transmission distance of RS-232 is short (the maximum transmission distance standard value is 15 meters), and the transmission distance of RS-485 is long (the maximum transmission distance is 1200 meters). 3) The maximum transmission distance standard value of the RS485 interface is 4000 feet, but it can actually reach 3000 meters. RS232 can only realize point-to-point communication. Many people recommend wiring things up on a prototype with Category 5 cable connected as point-to-point full-duplex RS-485. It works in full-duplex mode and requires three wires: ground, transmit and receive. RS-232 communication adopts unbalanced transmission mode (single-ended transmission), and RS-485 communication adopts balanced transmission mode (differential transmission mode). The RS485 interface adopts balanced transmission and differential reception, so it has the ability to suppress common mode interference.