From: Dave B. <pil...@ya...> - 2007-06-06 17:58:09
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I'm looking to do something similar soon, most likely with a console board to an external modem, using pppd in buildroot to connect to a dial up internet connection. The bottom line is, yes, you can do it with just tx, rx and gnd. The settings to allow this will vary between modem manufacturers (US robotics used to have dip switches, most have been superseded by nvram switches set by AT commands). Also, without any hardware handshaking your best results will occur at or below 4800baud. ----- Original Message ---- From: "no...@ho..." <no...@ho...> To: gum...@li... Sent: Tuesday, June 5, 2007 3:00:52 PM Subject: [Gumstix-users] Repost - need help with modem! All, I posted a couple of weeks back and got no response at all, so forgive me, but I'm trying again. I need to hook a serial modem (pots) up to the robostix on the STUART port. I have a console up and going on the FFUART port and don't want to use a tweener board. If I turn off all flow control, etc. on the port, is it possible to use a dial-up modem with just TX/RX/G/5v TTL via the STUART port? If so, what am I missing? I keep thinking that I should be able to do this without the modem control lines, etc..somehow. If this isn't possible, is there a way to route modem control signals through some of the GPIO's on the robostix or some other method I could use that would be sensible? I have read about folks using the tweener with a modem and I don't see that it really has more signals than the STUART. Just that it's raised to RS/232. This modem will work with RS/232 or TTL at 3.3v. Also, I notice when I put a meter on the STUART that instead of 3.3v TTL I am seeing 5v on the Vcc pin?? I'm confused as I thought it was supposed to be at 3.3v. :-) (original post here: http://article.gmane.org/gmane.linux.distributions.gumstix.general/24539/match=) Thanks and...Help?! --Pat ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users ____________________________________________________________________________________ Luggage? GPS? Comic books? Check out fitting gifts for grads at Yahoo! Search http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz |