Quote Originally Posted by Josephus
The Asus wl500g deluxe has uart pinout onboard, so 2 serial ports can be added to the unit.
The only difference between wl500g and wl500gx that the deluxe does not require a UART chip, so a simple RS232 transceiver will do the trick.

Here are my experiences adding a single serial port to the router
The parts you need:
- 1 MAX3232 IC (SO-IC)
- 5 1uF capacitors
- cables, connectors

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There is an alternate way. All these parts are built into a Nokia serial data cable which can be bought quite cheap now. Just connect up 3 wires tx, rx and ground that used to go to the phone to the connector in the WL500gx.
The other end of the cable has a 9-pin to connect to the PC.