![]() ![]() Once found, you can easily check where is GND, which is connected to the same ground layer than the power connector. To find out the serial console pins on the PCB, you will be looking for a populated or unpopulated 4-pin header, which can be far from the SoC (signals are relatively slow) and usually with tracks on the top or bottom layer of the PCB, and connected to the TX and RX. Since your router is very likely to have its I/O pins working at 3.3V ( TTL level voltage), you will need a level shifter such as a Maxim MAX232 to change the level from 3.3V to your computer level which is usually at 12V. ![]() So in contrast to the JTAG-Port, the Serial Ports needs some software running on the CPU so we can use it! In case the bootloader is damaged, or does not offer such a feature, the port is useless.įinding an UART on a router is fairly easy since it only needs 3 signals (without modem signaling) to work : GND, TX and RX (often accompanied by VCC). ![]()
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