12/4/2023 0 Comments Loopback serial port linux![]() ![]() Initially, we are validating RS232 serial communication. Our final requirement is to support RS485 mode with baud rate 115200. The test you describe using two ports (& USB-serial adapters) is not a 'loopback' in the conventional sense (which typically would. a host port capable of connecting a multiple of USB devices) with a specific type of USB device, a USB-serial adapter. ![]() You can check and control all serial port lines (CTS, RTS, DTR. A serial (RS-232) port is not equivalent to a USB port. ![]() Could you please check the issue and provide your inputs? Implemented Serial Port Terminal is working with the Virtual Serial Ports (COM12 for example). We have to close minicom to send next data. In some cases, if we send “enter” key to receiving, then it is hanged and transmission stopped. ![]() This issue occurs for remaining data transfer. But if we send data(characters) from serial port 2(ttyLP3) to serial port 1(ttyLP1) first data always reflected back to the same window. We have sent data from serial port 1 (/dev/ttyLP1) and data received properly in serial port 2(/dev/ttyLP3). Note: Self loopback serial data properly received in serial port 2 (/dev/ttyLP3) We have attached the screenshot for reference.Ĭould you please check the issue and update us? Since its a loopback, you will read what you just wrote and save it to the buffer variable. Next if we send character, it is properly received. After writing to the serial port, you can read from it. We are getting garbage values on this case. In order to test serial communication Linux has a great feature where you can create virtual serial ports and connect them to each other. But if we send “Enter” key then we have faced issue. We have tested serial port 1 (/dev/ttyLP1) with self-loopback and noticed sending characters were properly received back in the same windows. We have observed below issues in serial port 1 and 2, We have used minicom inbuilt tool to test serial port. Serial port 3(/dev/ttyLP0) and 4(/dev/ttyLP2) are working properly.
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