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Rs485 Cable Etics and Etiquette

by Shelli Berube (2024-07-06)


Due to loading limitations one of the best uses of a RS232 to RS422 serial converter might be in point-to-point communications, such as extending an existing RS232 line. If your PC or controller only has RS232 port then you need an RS232 to RS485 converter or adapter for your PC or controller. RX led. When connecting that RS485 adapter to the PC's COM port, sending data to that port would make the RX led flash. Wire up the RS485 stacks and set the termination switch on the first and last RS485 Extension in the bus to "on", as shown below. To configure a RS485 Extension you first have to choose the baud rate, parity and stop bits. Confirm serial port parameters such as baud rate, data bits, and stop bits: Baud rate should be configured according to the connected RS485 device, commonly used rates are 9600 and 115200; Refer to the device manual or contact RS485 device technical support for configuration, especially if set to Modbus mode, confirm if the function code matches. If your bus isn't absolutely huge you should probably choose "speed: 2000000 (2Mbit/s), parity: None, Stop bits: 1". If you start to get timeouts and the CRC error counter is rising rapidly, you might want to lower the baud rate.


A RS485 bus consists of one master and multiple slaves. A RS232 - RS485 converter is often used in industrial data acquisition and control applications where multiple serial devices communicate with each other through a converter. There are several factors to consider when choosing a RS232 - RS422 converter. Extending a RS232 line is done by converting the RS232 signal into RS422 and then back to RS232 at the remote end. This way you can extend the RS422 signal for up to 4000 feet. Also, its robustness. It is a differential signal. The RS422 converter is used for data transmission, using balanced or differential signaling, it is mainly used in industrial and commercial environments since lots of process equipment and machinery have this protocol built-in. For example you need to consider the noise level in the environment surrounding the serial converter. The serial RS232 to RS485 converter and RS232 to RS422 converter units, also called serial converters, are small electronic devices used to convert a serial RS232 signal, (for example the COM port in older computers) into either RS485 or RS422 signals. And what is a RS232 to RS422 converter?


So in order to transfer data from a RS232 serial interface engineers need a converter to be able to connect to a RS485 or RS422 interface. The typical serial converter does this in both directions which is also referred to as a bi-directional converter. The RS485 converter interface uses two wires for communication, one for transmitting and one for receiving data, which is referred to as a half-duplex communication converter. Usually a RS232 - RS485 converter is the preferred way to establish multi-point networks when working with RS232 devices. If you need technical support or have any feedback/review, please click the Submit Now button to submit a ticket, Our support team will check and reply to you within 1 to 2 working days. However since only a true RS485 network can have addressable serial RS485 devices, the RS232 converter needs to be addressable either by software or by DIP switches when using it in this type of configuration.


Why use a RS232 - RS485 /RS422 converter? Most newer consumer electronics comes with an USB, Firewire or other high-speed communication port, however a lot of industrial and commercial equipment, both old and new, is made only with a RS485 or RS422 serial communications port. Use a 485 to USB serial cable, connect it to the interface of the 485 device and the computer's USB port, assign a COM port on the computer, open serial debugging assistant software, set the serial port parameters consistently, input the corresponding COM port, and monitor the data from the 485 device. If the serial port terminal device receives data but does not respond properly, monitor the data from the serial port device. Confirm hardware connections including serial port devices, and check if your gateway and energy meter are correctly connected. Test options include: audio, video, ping, TDR, PoE, IP network connections, and LAN (local area network) cable connections.



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