WRT54GS Serial Port

This page contains instructions on how to add two serial ports (one DB9 Female DCE port and one DB9 Male DTE port) to a Linksys WRT54G (version 2 hardware) or Linksys WRT54GS wireless router.

THIS WILL VOID THE WARRANTY ON YOUR ROUTER.

The DB9F (Female) connector on the front is wired as a DCE (think of this as a peripheral serial port), and can be connected directly to the serial port on a host PC. This gives you access to the built-in serial console on the router (115200, 8, N, 1).

The DB9M (Male) connector on the top is wired as a DTE (think of this as a host serial port), and can be connected directly to peripherals like an external serial modem, or other serial devices which are normally connected to the serial port on a host PC.

The pinout of JP1 on the Linksys PCB is as follows:

Pin  1: 3.3V        Pin  2: 3.3VPin  3: Tx (ttyS1)  Pin  4: Tx (ttyS0)Pin  5: Rx (ttyS1)  Pin  6: Rx (ttyS0)Pin  7: NC          Pin  8: NCPin  9: GND         Pin 10: GND

转自：http://www.rwhitby.net/projects/wrt54gs