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Cellular Phone Forum / General / GSM / December 2003Serial - GSM Modem
I'm looking for a cellular modem for my embedded project. It needs to be GSM and use a standard serial connector. My embedded PC104 board has serial ports but no pcmia slots. I need to be able to call this system, have it answer, then retrieve data. Currently doing this with an old brick phone and the Motorola Interface, however that technology is gone and replacement items are hard to find. I'm looking at the Microcomm MTCBA-G-F2 however they seem to be out of stock a lot. Does anyone have suggestions? Richard > I'm looking for a cellular modem for my embedded project. It > needs to be GSM and use a standard serial connector. My [quoted text clipped - 8 lines] > > Does anyone have suggestions? Wavecom modems seem to be very highly regarded these days. It's the brand I'm seriously considering buying. What country and/or bands are you operating in? Someone might have a more specific recommendation. John I wrote: > Wavecom modems seem to be very highly regarded these days. And I forgot to add: http://www.wavecom.com/home/XMLindex.php John The equipment will stay in North America. The equipment is skid mounted and does move to different locations throughout the US. The Seimens TC35 looks promising as well, however I will have to find a distribution center and try to get some prices from someone. I need to dig around on the Wavecomm site, didn't see much info there however I just barely browsed it. Thanks for the ideas. Richard > > I'm looking for a cellular modem for my embedded project. It > > needs to be GSM and use a standard serial connector. My [quoted text clipped - 16 lines] > > John > The equipment will stay in North America. The equipment is > skid mounted and does move to different locations throughout [quoted text clipped - 3 lines] > to find a distribution center and try to get some prices from > someone. I've been very impressed by Siemens handsets for years, and use them myself. But I've read negative comments about their modems. I seem to remember reading that their modem firmware development has been outsourced since the M20, and suffers as a consequence. A google groups search should turn up some first-hand references. > I need to dig around on the Wavecomm site, didn't see much info > there however I just barely browsed it. http://www.airdesk.net/tech_manufacturer.php?man=3 is the US distributor. John >The Seimens TC35 looks promising as well, however I will have to find a >distribution center and try to get some prices from someone. Our experience with those units has not been so good. Recommend the Wavecom Fastrack instead. Hope this helps. regards Marcus maybe take a look at http://www.rim.net/products/oem/index.shtml would this be able to be adapted? > I'm looking for a cellular modem for my embedded project. It needs to be > GSM and use a standard serial connector. My embedded PC104 board has serial [quoted text clipped - 8 lines] > Does anyone have suggestions? > Richard > I'm looking for a cellular modem for my embedded project. It needs to be > GSM and use a standard serial connector. My embedded PC104 board has serial [quoted text clipped - 8 lines] > Does anyone have suggestions? > Richard Here's a release on a 800/1900 or 900/1800 MHz GSM module, the Nokia 12: http://www.nokiausa.com/about/newsroom/article/1,2105,1897,00.html http://nds2.photos.nokia.com/press/photo/phones/jpeg/cardphone2.jpg John C. > I'm looking for a cellular modem for my embedded project. It needs to be > GSM and use a standard serial connector. My embedded PC104 board has serial > ports but no pcmia slots. I need to be able to call this system, have it > answer, then retrieve data. Currently doing this with an old brick phone > and the Motorola Interface, however that technology is gone and replacement > items are hard to find. Depending on how many units you need, and whether you need a consistent supply for the future, you might want to look at the Ericsson R520m cellphone. You can get them for under $100. Just throw a serial cable on, and it should work. Tri-band, GPRS, external antenna jack as well. They only need a 5v supply. You'd probably want to wire a relay of some kind to the power switch so that the phone could be turned on and off programmatically. This is of course a hackish solution, but it is cheap. OTOH, given my problems with the Motorola T720i - can't keep an active GPRS link up for more than 24h before there's a problem - I would do some testing for robustness first. Do you know if it auto answers okay? The Nokia phones modem can't see the ring response and they will not answer an incoming data call. Most of the Motorola's I've fooled with seem to auto answer okay. Thanks, Richard > > I'm looking for a cellular modem for my embedded project. It needs to be > > GSM and use a standard serial connector. My embedded PC104 board has serial [quoted text clipped - 15 lines] > for more than 24h before there's a problem - I would do some testing > for robustness first. Hi Richard I can recommend the Siemens MC45. It's similar to Siemens Tc35 but 3-Band(900,1800,1900) GPRS and has two(!) serial Interfaces. see http://www.siemens-mobile.com/cds/frontdoor/0,2241,hq_en_0_2233_rArNrNrNrN_prodI d%253A2233_prodParentId%253A954,00.html for details Regards Peter > I'm looking for a cellular modem for my embedded project. It needs to be > GSM and use a standard serial connector. My embedded PC104 board has serial [quoted text clipped - 8 lines] > Does anyone have suggestions? > Richard >Does anyone have suggestions? The Wavecom Fastrack is very good. We use it in conjunction with SMS to e-mail and e-mail to SMS software. Previously used the Siemens M20T but decided not to use the Siemens TC35 when it was launched as the "upgrade" to the M20T, because of its inferior firmware. Hope this helps. regards Marcus Hi Richard I can recommend the Siemens MC45. It's similar to Siemens Tc35 but 3-Band(900,1800,1900) GPRS and has two(!) serial Interfaces. see http://www.siemens-mobile.com/cds/frontdoor/0,2241,hq_en_0_2233_rArNrNrNrN_prodI d%253A2233_prodParentId%253A954,00.html for details Regards Peter > I'm looking for a cellular modem for my embedded project. It needs to be > GSM and use a standard serial connector. My embedded PC104 board has serial [quoted text clipped - 8 lines] > Does anyone have suggestions? > Richard > I can recommend the Siemens MC45. > It's similar to Siemens Tc35 but 3-Band(900,1800,1900) GPRS and has two(!) > serial Interfaces. > see > http://www.siemens-mobile.com/cds/frontdoor/0,2241,hq_en_0_2233_rArNrNrNrN_prodI d%253A2233_prodParentId%253A954,00.html > for details May you should have a look on www.gsm-modem.de . The devices you can get from www.roundsolutions.com and they ship worldwide. - Triband if you like - Embedded TCP/IP stack - Control of CMOS camera by AT command to send JPEGs - Battery charger - Internal SIM card reader - Very small - Cheap - Huge Internet community and factory support - And a lot of more... Regards Meff |
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