# EM7421 Unable to find satellites **URL:** \ **Category:** MC/EM Series\ **Created:** [March 19, 2024, 2:48pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857 "2024-03-19T14:48:37Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![gapodi7715](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@gapodi7715](https://forum.sierrawireless.com/u/gapodi7715)\ **Post date:** [March 19, 2024, 2:48pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/1 "2024-03-19T14:48:37Z")
Unable to configure the device to work with GPS. The driver was installed from this website and there are no errors during device detection. ModemManager is either removed or not in use. In devices /dev/ttyUSB0, /dev/ttyUSB1, /dev/ttyUSB2. Please help with identifying the problem. Thank you in advance. ![Снимок экрана от 2024-03-19 17-44-49](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/c/c2aa861b6888af0cb5f119f77b16ac01f42b06f6.png) ![Снимок экрана от 2024-03-19 17-44-30](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/a/ad9e91f2f665a6edf01ca69c7930f347d32b9d21.jpeg) ![Снимок экрана от 2024-03-19 17-44-12](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/2/230cc0a2311d3b22dc00f79340de049b10dd7b9d.png) ![Снимок экрана от 2024-03-19 17-43-50](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/7/74f6430970da13cfdaa9e00985bb426055ec33df.jpeg) ![Снимок экрана от 2024-03-19 17-43-09](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/f/fd99f6611e01fd8c3f9a07d66aab3a1e131d90d4.png) ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 19, 2024, 2:51pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/2 "2024-03-19T14:51:22Z")
Did you connect gps anteanna? Did you check with AT command? Ati3 At!entercnd=“A710” At!custom? At!gpssatinfo? ---
**Author:** ![gapodi7715](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@gapodi7715](https://forum.sierrawireless.com/u/gapodi7715)\ **Post date:** [March 19, 2024, 2:57pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/3 "2024-03-19T14:57:46Z")
Trying to connect to the terminal for command input, but the field is empty and I can’t input any text. ![Снимок экрана от 2024-03-19 17-55-42](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/d/d8db361feb4e48dd3d46529374506f92f9393c03.png) ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 19, 2024, 3:00pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/4 "2024-03-19T15:00:53Z")
How about other port? Do you install the correct MBPL usb driver? > [@Panasonic cf-20 em7305 gps problem on ubuntu](https://forum.sierrawireless.com/t/panasonic-cf-20-em7305-gps-problem-on-ubuntu/31853/4): > > you can install the MBPL USB driver: (MBPL\_DRIVERS\_R35\_ENG4-usb-src.tar) [https://source.sierrawireless.com/resources/airprime/software/mbpl/mbpl-software-latest/#sthash.ZXRwiiKx.1i3tew3y.dpbs](https://source.sierrawireless.com/resources/airprime/software/mbpl/mbpl-software-latest/#sthash.ZXRwiiKx.1i3tew3y.dpbs) Do you try with windows? ---
**Author:** ![gapodi7715](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@gapodi7715](https://forum.sierrawireless.com/u/gapodi7715)\ **Post date:** [March 19, 2024, 3:05pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/5 "2024-03-19T15:05:06Z")
> [@jyijyi](#): > > How about other port? > Do you install the correct MBPL usb driver? > > Do you try with windows? These drivers were used. It works under Windows. MBPL\_DRIVERS\_R35\_ENG4-usb-src.tar Assembled from source code ![photo_2024-03-19_18-02-32](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/b/bc7652038a3b77f09d2ae78a1eec392c4f073136.jpeg) ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 19, 2024, 3:07pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/6 "2024-03-19T15:07:16Z")
Then you can try those AT command in windows and see if it can view satellite ---
**Author:** ![gapodi7715](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@gapodi7715](https://forum.sierrawireless.com/u/gapodi7715)\ **Post date:** [March 19, 2024, 3:12pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/7 "2024-03-19T15:12:23Z")
Yes, very well, we will check this. However, it is necessary for it to work on Linux. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 19, 2024, 3:19pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/8 "2024-03-19T15:19:16Z")
Does it work for using minicom on ttyUSB2 or ttyUSB0? have you tried Ubuntu 18? ---
**Author:** ![gapodi7715](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@gapodi7715](https://forum.sierrawireless.com/u/gapodi7715)\ **Post date:** [March 19, 2024, 3:33pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/9 "2024-03-19T15:33:02Z")
Yes, I was able to send AT commands via minicom using ttyUSB0. ![Снимок экрана от 2024-03-19 18-31-03](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/f/f6c7f33f489dfd8e55d98bf273f92e0431694daf.png) ![Снимок экрана от 2024-03-19 18-30-37](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/c/cb4b54040d4a235c008df99ee84de8a0e3ab80da.png) However, as a result, it still doesn’t detect any satellites. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 19, 2024, 3:34pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/10 "2024-03-19T15:34:35Z")
didn’t it show there is satellite in AT!GPSSATINFO? Did you see any NMEA frame in /dev/ttyUSB1? ---
**Author:** ![gapodi7715](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@gapodi7715](https://forum.sierrawireless.com/u/gapodi7715)\ **Post date:** [March 19, 2024, 3:43pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/11 "2024-03-19T15:43:59Z")
No, there were no new data appearing in ttyUSB1. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 19, 2024, 3:45pm UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/12 "2024-03-19T15:45:10Z")
you can try: AT!ENTERCND=“A710” AT!GPSFIX=1,255,10000 and see if within those 255 seconds, any NMEA frame coming out from /dev/ttyUSB1? ---
**Author:** ![gapodi7715](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@gapodi7715](https://forum.sierrawireless.com/u/gapodi7715)\ **Post date:** [March 20, 2024, 7:20am UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/13 "2024-03-20T07:20:33Z")
![Снимок экрана от 2024-03-20 10-19-36](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/9/95bd42b3344a1603dcf86fc92fc508de16972e0d.png) This did not help. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 20, 2024, 7:27am UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/14 "2024-03-20T07:27:49Z")
how about this? AT!GPSEND=0 AT!GPSFIX=1,255,1000 ---
**Author:** ![gapodi7715](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@gapodi7715](https://forum.sierrawireless.com/u/gapodi7715)\ **Post date:** [March 20, 2024, 7:49am UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/15 "2024-03-20T07:49:10Z")
![Снимок экрана от 2024-03-20 10-47-19](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/c/c76e31c9cb315f0028f9eccbbb9a700ad942bc3a.png) ![Снимок экрана от 2024-03-20 10-47-34](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/2/240ba565cfa1d7f946d669064ea160f4ca79f21a.png) Okay, now we are seeing this output. However, the data is still not visible in cgps. AT!GPSFIX=1,255,1000 - We also entered it. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 20, 2024, 7:59am UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/16 "2024-03-20T07:59:06Z")
then what is the problem? your application? NMEA frame? ---
**Author:** ![gapodi7715](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@gapodi7715](https://forum.sierrawireless.com/u/gapodi7715)\ **Post date:** [March 20, 2024, 8:03am UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/17 "2024-03-20T08:03:01Z")
The problem is that in GPS programs, there is no information about the satellites. The module’s operation is not visible, and there is no data. The programs used are CGPS and GPSMON and GPSD ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 20, 2024, 8:03am UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/18 "2024-03-20T08:03:39Z")
then why NMEA frame is showing satellite but your application cannot view it? ---
**Author:** ![gapodi7715](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@gapodi7715](https://forum.sierrawireless.com/u/gapodi7715)\ **Post date:** [March 20, 2024, 8:08am UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/19 "2024-03-20T08:08:17Z")
What program would you recommend for obtaining satellite data? So that it is clearly visible that the GPS module is working correctly? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 20, 2024, 8:11am UTC](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857/20 "2024-03-20T08:11:58Z")
i don’t know, i never used any gps program You can have a look on the raw NMEA frame and decode it and see why your program cannot see those satellite [Next page](https://forum.sierrawireless.com/t/em7421-unable-to-find-satellites/31857.md?page=2)