Show pagesourceOld revisionsBacklinksBack to top × Serial connection can receive but can not send Issue: When connected via serial to my device and booting up, I can receive data, but I can not send anything, i.e. no keyboard input possible during boot process. Root causes: Faulty serial adapter No physical connection between the RX serial pin/pad on the board and the CPU intended by the OEM (resistor or jumper not soldered) unintended by user (bad soldering of pins/wires, lose plug contact, pcb trace cut/delaminated, …) Solutions: Open putty and test serial adapter by connecting RX and TX If what you type on the keyboard is echoed back to the screen → OK If not → faulty serial adapter, get a new one. Check the serial connection visually for continuity. In case of interruptions detected Solder missing resistors/jumpers → see devicepage of your device (use the wiki search or the ToH to find the devicepage) Make sure pins/wires are soldered correctly. Re-solder if necessary. Repair any cut pcb traces / delaminated pads Links: Serial port troubleshooting In case of doubts / still not working → OpenWrt forum FAQ, serial connection This website uses cookies. By using the website, you agree with storing cookies on your computer. Also you acknowledge that you have read and understand our Privacy Policy. If you do not agree leave the website.OKMore information about cookies FAQ serial connection Last modified: 2019/09/11 11:36by tmomas