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???
04/22/09 02:43
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 		 #164766 - USB 3G Modems
Responding to: ???'s previous message
As to how hard it is to interface with various USB devices, the first place to look is Linux - if there's Linux drivers there's a fair chance that you can get hold of the source code to talk to the device. Sometimes there is a pre-compiled binary to hide the stuff the manufacturer doesn't want you to see - if this the case, then you'll have problems.

This device seems to be popular and looks like a serial device

http://en.wikipedia.org/wiki/Huawei_E220

So to interface to an 8051, something like the Vinculum might work but a PL2303 won't as it is a USB slave device.

Personally I'd think it would be easier to use a standard module like Wavecom or Telit.

List of 68 messages in thread
TopicAuthorDate
How do I interface a usb hsdpa modem?            01/01/70 00:00      
   Needs a USB Host            01/01/70 00:00      
      I agree with Andy            01/01/70 00:00      
         UART on the way out            01/01/70 00:00      
         USB Hsdpa Modem is what I have            01/01/70 00:00      
            Irrelevant            01/01/70 00:00      
            Hidden costs            01/01/70 00:00      
   USB for highspeed            01/01/70 00:00      
      Still needs a host            01/01/70 00:00      
         Follow            01/01/70 00:00      
            Vinculum (VNC1)            01/01/70 00:00      
            USB 3G Modems            01/01/70 00:00      
      Bigger processor core needed for USB host            01/01/70 00:00      
         RE: USB Wireless modem is cheaper            01/01/70 00:00      
            Same same            01/01/70 00:00      
               Not just for USB host            01/01/70 00:00      
                  Winmodem/Winprinter...            01/01/70 00:00      
                  GSM WinModem/Softmodem?            01/01/70 00:00      
               Not quite - more of the same!            01/01/70 00:00      
               And an IP Stack?            01/01/70 00:00      
                  What is your expected production volume            01/01/70 00:00      
   PL2303            01/01/70 00:00      
      You still haven't said what the "problem" actually is!            01/01/70 00:00      
         Typo - PL203            01/01/70 00:00      
      You dont get the point do you            01/01/70 00:00      
   Vinculum VNC1L USB Host DIP Module            01/01/70 00:00      
   Vinculum VNC1L USB Host DIP Module            01/01/70 00:00      
      this seems to be the right solution            01/01/70 00:00      
         Can be problem to connect and use USB modems            01/01/70 00:00      
            the trick is            01/01/70 00:00      
               Easy for RS232            01/01/70 00:00      
         ZTE MF622            01/01/70 00:00      
            RE: ZTE MF622            01/01/70 00:00      
               Yes, thats the one            01/01/70 00:00      
                  I already developed a vb program            01/01/70 00:00      
                     geez man, you are very good!            01/01/70 00:00      
                        hsdpa is very cheap            01/01/70 00:00      
                           yes i am sure            01/01/70 00:00      
                              The running costs - not the hardware cost            01/01/70 00:00      
                                 Check tariff carefully!            01/01/70 00:00      
                                    it's very cheap here in india            01/01/70 00:00      
                                       0.025 cent?            01/01/70 00:00      
                                       Wow!!            01/01/70 00:00      
                                          sometimes happen            01/01/70 00:00      
                                             I am planning to use other mcus            01/01/70 00:00      
                                                well done...very high tech            01/01/70 00:00      
                                                   8052 is what i am goining to use            01/01/70 00:00      
                                                      Saving money by spending money            01/01/70 00:00      
                                                         Which ARM Chips is that?            01/01/70 00:00      
                                                            Parametric search            01/01/70 00:00      
                                                               There is no USB Host Option            01/01/70 00:00      
                                                                  Have you used the parametric search yet?            01/01/70 00:00      
                                                                     ds89c430 or AT91RM9200?            01/01/70 00:00      
                                                                        Too wide question            01/01/70 00:00      
                                                                           USB OTH -> USB OTG            01/01/70 00:00      
                                                                  RE: there is only USART option            01/01/70 00:00      
                                                      Makes no sense            01/01/70 00:00      
                              RE: lot of other apps            01/01/70 00:00      
                     relies totally upon having a PC with Windows            01/01/70 00:00      
                        A number of USB modules with naughty tricks            01/01/70 00:00      
               Using Ferarri for race            01/01/70 00:00      
                  actually            01/01/70 00:00      
                     Bing makes design decisions first, then creates the threads            01/01/70 00:00      
                        firmwre documentattion link            01/01/70 00:00      
                           That's not what you need!            01/01/70 00:00      
                              something with powerfull            01/01/70 00:00      
                                 Still useless without the necessary documentation!            01/01/70 00:00      
                  Nice Metaphors            01/01/70 00:00      

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