# Supreme 20 + IESM GPS+USB+IO : GPS not working **URL:** \ **Category:** Open AT\ **Created:** [December 21, 2008, 6:33pm UTC](https://forum.sierrawireless.com/t/supreme-20-iesm-gps-usb-io-gps-not-working/2768 "2008-12-21T18:33:06Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![rol1](https://avatars.discourse-cdn.com/v4/letter/r/73ab20/32.png) [@rol1](https://forum.sierrawireless.com/u/rol1)\ **Post date:** [December 21, 2008, 6:33pm UTC](https://forum.sierrawireless.com/t/supreme-20-iesm-gps-usb-io-gps-not-working/2768/1 "2008-12-21T18:33:06Z")
Hello, Sorry if my question is stupid, I’m a newbie… I’ve received my Supreme 20 and the IESM GPS+USB+IO module, and I’ve installed everything. Then, I’ve started the modem, and using the document IESM GPS+USB+IO User Guide, I’ve started sending commands to the modem : AT+WCFM=5 +WCFM: 00000030,0 This should indicate that the GPS functionnality is present. AT+WOPEN=1 OK AT+NMEA=1 ERROR Reading this forum, it seems that some people are downloading code to the modem. But, from the doc., it says that AT+WOPEN=1 does activate the C-GPS sample code. What am I missing ? All I want is to receive NMEA GPS information on the serial port that I’m using to send the AT commands to the modem. I’ve downloaded : Wavecom Open AT Software Suite 2.12.exe Open\_AT\_C-GPS\_Plug\_In\_v3.04.exe Open\_AT\_C-GPS\_Plug\_In\_v1.07.exe but I can’t find any dwl with “GPS” in the name… and even if I found one, I have no idea on how to download it to the modem. Could someone provide some help on how to start the GPS ? Thanks in advance, Paul ---
**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\ **Post date:** [December 21, 2008, 8:47pm UTC](https://forum.sierrawireless.com/t/supreme-20-iesm-gps-usb-io-gps-not-working/2768/2 "2008-12-21T20:47:11Z")
> [@rol](#): > > from the doc., it says that AT+WOPEN=1 does activate the C-GPS sample code. What “doc” is that? AT+WOPEN=1 will activate whatever Open-AT application is currently present within the unit - it is not specific to any “C-GPS sample code”. ---
**Author:** ![rol1](https://avatars.discourse-cdn.com/v4/letter/r/73ab20/32.png) [@rol1](https://forum.sierrawireless.com/u/rol1)\ **Post date:** [December 22, 2008, 8:44am UTC](https://forum.sierrawireless.com/t/supreme-20-iesm-gps-usb-io-gps-not-working/2768/3 "2008-12-22T08:44:08Z")
> [@](#): > > What “doc” is that? It is : IESM GPS+USB+IO User Guide.pdf which can be found in the Download section. > [@](#): > > AT+WOPEN=1 will activate whatever Open-AT application is currently present within the unit - it is not specific to any “C-GPS sample code”. I understand that. But I had the impression that the modem and the module were delivered with a GPS code that AT+WOPEN=1 would activate automatically, without having to download anything to the module, if the answer to : AT+WCFM=5 didn’t contain 00000031, as indicated in the doc (still the same), page 3. Am I missing something obvious ? Do I have to download some piece of code to the modem/module to receive NMEA from the GPS ? If so, is there one that I can use in the SDK and other download stuff on Wavecom web site ? Regards, Paul ---
**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\ **Post date:** [December 22, 2008, 8:54am UTC](https://forum.sierrawireless.com/t/supreme-20-iesm-gps-usb-io-gps-not-working/2768/4 "2008-12-22T08:54:41Z")
> [@rol](#): > > But I had the impression that the modem and the module were delivered with a GPS code that AT+WOPEN=1 would activate automatically, without having to download anything to the module You need to check that with your supplier - only they will know precisely what they delivered to you! And they should be able to support you in getting it working…