WRT54G Serial Port Interfacing W/ Cell Phone

Discussion in 'Cisco/Linksys Wireless Routers' started by neutronscott, Oct 30, 2008.

  1. neutronscott

    neutronscott Addicted to LI Member

    First off, yeah I've googled forever. :) I can fix electronics better but not design...

    I get 3.3V on my RX and TX pins normally, and when I sent characters using "microcom -D/dev/tts/1" I saw the voltage go down to 0V on the TX pin using an O-scope. This is normal behavior, yes?

    So to interface with my Nokia cell phone I would think I could just hook Tx, Rx, GND to the Pop port and voila! Thus far no success, again with microcom, and setting the speed with stty and in microcom ...

    I've not tried the phone connected to RS-232, as I don't have the cable, which will end up being a MAX232, but if you understand electronics design, check section 1.6.1 of this: http://www.panuworld.net/nuukiaworld/hardware/cables/basics.htm

    What does this mean to me? What do I do to connect my phone to this TTL-RS232 port? :)

    Looking at the diagram of the fbus cable I'd think all I was missing was D4, a schottky diode for the Rx line (Tx on WRT54g), which I'm not seeing the point of...
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