# XS Series (GNSS) **URL:** https://forum.sierrawireless.com/c/modules/gnss/88.md [Latest](https://forum.sierrawireless.com/latest.md) · [Categories](https://forum.sierrawireless.com/categories.md) · [Tags](https://forum.sierrawireless.com/tags.md) --- ## [About the XS Series (GNSS) category](https://forum.sierrawireless.com/t/about-the-xs-series-gnss-category/12546)
**Author:** [@mlw](https://forum.sierrawireless.com/u/mlw)\ **Replies:** 0\ **Last updated:** [May 3, 2018, 6:10am UTC](https://forum.sierrawireless.com/t/about-the-xs-series-gnss-category/12546 "2018-05-03T06:10:07Z")
Topics related to XS Series and former GNSS/GPS positioning modules. Check out source.sierrawireless.com for the documentation, firmware & development tools. --- ## [HL7812 EVK - GNSS Not Acquiring Satellite Fix (Firmware 5.4.12.2)](https://forum.sierrawireless.com/t/hl7812-evk-gnss-not-acquiring-satellite-fix-firmware-5-4-12-2/35699)
**Author:** [@vagesh.p](https://forum.sierrawireless.com/u/vagesh.p)\ **Replies:** 7\ **Last updated:** [January 19, 2026, 5:28am UTC](https://forum.sierrawireless.com/t/hl7812-evk-gnss-not-acquiring-satellite-fix-firmware-5-4-12-2/35699 "2026-01-19T05:28:35Z")
I am experiencing issues with GNSS functionality on the HL7812 EVK board. Despite following the standard AT command sequence, the GNSS module is unable to acquire a satellite fix and shows zero satellites in use. Hardwa… --- ## [HL7812 GNSS Not Working – GNSSSTART Resets, CME Errors, FIX NOT AVAILABLE](https://forum.sierrawireless.com/t/hl7812-gnss-not-working-gnssstart-resets-cme-errors-fix-not-available/35668)
**Author:** [@vagesh.p](https://forum.sierrawireless.com/u/vagesh.p)\ **Replies:** 3\ **Last updated:** [December 16, 2025, 5:17am UTC](https://forum.sierrawireless.com/t/hl7812-gnss-not-working-gnssstart-resets-cme-errors-fix-not-available/35668 "2025-12-16T05:17:02Z")
I am working with the HL7812 module and facing issues enabling and using GNSS. Despite following the standard AT command sequence, GNSS does not provide a fix and several GNSS-related commands return errors. Below are t… --- ## [GlobalTop MiniMouseGPS MT3333 Overroll issue, upgrade fail](https://forum.sierrawireless.com/t/globaltop-minimousegps-mt3333-overroll-issue-upgrade-fail/16512)
**Author:** [@Televox](https://forum.sierrawireless.com/u/Televox)\ **Replies:** 1\ **Last updated:** [November 26, 2025, 8:20am UTC](https://forum.sierrawireless.com/t/globaltop-minimousegps-mt3333-overroll-issue-upgrade-fail/16512 "2025-11-26T08:20:27Z")
Hi, I have some GlobalTop MiniMouseGPS modules based on MT3333 (firmware ANX1.10 2028) with overroll problem. I tried to upgrade (using Global Top Flash Tool V1.2.3, PC with XP or Win7) but it fails with error: \[Flash… --- ## [Assistance Needed with Sierra GNSS XA1110 Serial Number Query](https://forum.sierrawireless.com/t/assistance-needed-with-sierra-gnss-xa1110-serial-number-query/32055)
**Author:** [@Mehrdad87](https://forum.sierrawireless.com/u/Mehrdad87)\ **Replies:** 3\ **Last updated:** [April 23, 2024, 9:08am UTC](https://forum.sierrawireless.com/t/assistance-needed-with-sierra-gnss-xa1110-serial-number-query/32055 "2024-04-23T09:08:07Z")
Dear Support, I hope this email finds you well. I’m reaching out because I’m having trouble querying the serial number of my Sierra GNSS XA1110 device using the “PGCMD227 Query Serial Number” command in the SW GNSS Tool… --- ## [Urgent Assistance Needed: GPS Module Displaying Incorrect Year (2020 instead of 2024)](https://forum.sierrawireless.com/t/urgent-assistance-needed-gps-module-displaying-incorrect-year-2020-instead-of-2024/31444)
**Author:** [@Mehrdad87](https://forum.sierrawireless.com/u/Mehrdad87)\ **Replies:** 2\ **Last updated:** [January 17, 2024, 11:29am UTC](https://forum.sierrawireless.com/t/urgent-assistance-needed-gps-module-displaying-incorrect-year-2020-instead-of-2024/31444 "2024-01-17T11:29:36Z")
Dear Sierrawireless Support Team, Recently, we have observed a discrepancy in the displayed year on the GPS module(GPS-XA1110 ). Instead of showing the correct year (2024), it is indicating the year 2020. time, month, … --- ## [XM1210 Bricked](https://forum.sierrawireless.com/t/xm1210-bricked/30425)
**Author:** [@fremersaro](https://forum.sierrawireless.com/u/fremersaro)\ **Replies:** 3\ **Last updated:** [September 5, 2023, 9:43am UTC](https://forum.sierrawireless.com/t/xm1210-bricked/30425 "2023-09-05T09:43:41Z")
We had to upgrade +40 XM1210 modules using the GNSS Tool. It worked fine in most of them but 5 modules are bricked now. The update was interrupted and now they don’t respond. Is there any method to recover them? --- ## [XS1110: Unexpected messages at startup](https://forum.sierrawireless.com/t/xs1110-unexpected-messages-at-startup/27731)
**Author:** [@vitor.batista](https://forum.sierrawireless.com/u/vitor.batista)\ **Replies:** 3\ **Last updated:** [March 21, 2023, 12:02pm UTC](https://forum.sierrawireless.com/t/xs1110-unexpected-messages-at-startup/27731 "2023-03-21T12:02:51Z")
Hi, I’m been working with the XS1110 GNSS module recently and there’s one thing about it that confuses me quite a lot. Despite being written in the documentation (in the AT Command Reference guide, more specifically) th… --- ## [GPS Week Number (WN) rollover](https://forum.sierrawireless.com/t/gps-week-number-wn-rollover/15457)
**Author:** [@jakinnard](https://forum.sierrawireless.com/u/jakinnard)\ **Replies:** 4\ **Last updated:** [November 14, 2022, 10:09am UTC](https://forum.sierrawireless.com/t/gps-week-number-wn-rollover/15457 "2022-11-14T10:09:49Z")
We have a product that uses the GlobalTop SL3C GPS module and we need to know whether this product will properly handle the WN rollover that will occur in April. We do not currently have access to a GPS simulator and so… --- ## [XS1110 DEV kit: L5 not populated nor documented](https://forum.sierrawireless.com/t/xs1110-dev-kit-l5-not-populated-nor-documented/27966)
**Author:** [@zdytfbqhvrwdsvtkln](https://forum.sierrawireless.com/u/zdytfbqhvrwdsvtkln)\ **Replies:** 1\ **Last updated:** [October 4, 2022, 10:12am UTC](https://forum.sierrawireless.com/t/xs1110-dev-kit-l5-not-populated-nor-documented/27966 "2022-10-04T10:12:33Z")
Hey there, I just got my XS1110 DEV Kit. I only have an active antenna at hand and would also prefer an active one. The documentation states to not fit L5 for passive antennas, so I thought I’ll simply leave it on the … --- ## [Ephemeris on I2c with XA1210](https://forum.sierrawireless.com/t/ephemeris-on-i2c-with-xa1210/25934)
**Author:** [@jfss](https://forum.sierrawireless.com/u/jfss)\ **Replies:** 0\ **Last updated:** [January 11, 2022, 11:53pm UTC](https://forum.sierrawireless.com/t/ephemeris-on-i2c-with-xa1210/25934 "2022-01-11T23:53:54Z")
Hi, i am Jeferson and currently am working with a custom board that has a XA1210 Gnss module on it. All firmware to receive and send commands through i2C i’ve been developing on last months. However, i’m trying to devel… --- ## [I2C on XA1110: Firmware and Datasheet Versions](https://forum.sierrawireless.com/t/i2c-on-xa1110-firmware-and-datasheet-versions/20567)
**Author:** [@kawasumilui](https://forum.sierrawireless.com/u/kawasumilui)\ **Replies:** 10\ **Last updated:** [November 9, 2021, 2:28am UTC](https://forum.sierrawireless.com/t/i2c-on-xa1110-firmware-and-datasheet-versions/20567 "2021-11-09T02:28:27Z")
We had a bit of a scare on a project where we are laying out a board that uses the XA1110. We were working with the link on digikey for part XA1110\_1104308. The datasheet there is rev1, according to which the I2C is diab… --- ## [AT commands via I2C to XS1110 GNSS](https://forum.sierrawireless.com/t/at-commands-via-i2c-to-xs1110-gnss/23906)
**Author:** [@Ratlake](https://forum.sierrawireless.com/u/Ratlake)\ **Replies:** 9\ **Last updated:** [June 17, 2021, 9:12pm UTC](https://forum.sierrawireless.com/t/at-commands-via-i2c-to-xs1110-gnss/23906 "2021-06-17T21:12:23Z")
Does anyone know how to send AT commands via I2C to SW XS1110? The module squirts out NMEA sentences over I2C with no problems but when I write “AT\\r\\n” to the default register, I don’t get anything back… I don’t have … --- ## [XM1210 with custom 1PPS](https://forum.sierrawireless.com/t/xm1210-with-custom-1pps/23512)
**Author:** [@jf.rose](https://forum.sierrawireless.com/u/jf.rose)\ **Replies:** 1\ **Last updated:** [April 23, 2021, 4:15am UTC](https://forum.sierrawireless.com/t/xm1210-with-custom-1pps/23512 "2021-04-23T04:15:41Z")
Hello, We are currently designing a board with an XM1210 GPS module on it in replacement of a previous model which is EOL. This model is also a matter of convenience since we use it on other boards. However, according t… --- ## [Replacement part for XM1100](https://forum.sierrawireless.com/t/replacement-part-for-xm1100/23006)
**Author:** [@rakeshm55](https://forum.sierrawireless.com/u/rakeshm55)\ **Replies:** 1\ **Last updated:** [March 4, 2021, 7:13am UTC](https://forum.sierrawireless.com/t/replacement-part-for-xm1100/23006 "2021-03-04T07:13:30Z")
What is the drop-in replacement part for XM1100? I could not find recommended part in your website. We are using an active antenna in our application AA.162.301111 (Taoglass). UART baud rate 115200 --- ## [XA1210 Sleep mode and Startup](https://forum.sierrawireless.com/t/xa1210-sleep-mode-and-startup/22221)
**Author:** [@mottergiuliano](https://forum.sierrawireless.com/u/mottergiuliano)\ **Replies:** 2\ **Last updated:** [November 25, 2020, 12:32pm UTC](https://forum.sierrawireless.com/t/xa1210-sleep-mode-and-startup/22221 "2020-11-25T12:32:26Z")
Hello, I’m working on a project with XA1210 and I have some doubts. 1 - While setting up sleep mode, one of the parameters are “sleep time”. What if I want it to sleep indefinitely, until I toggle the wakeup pin? How c… --- ## [TTFF On XA1210](https://forum.sierrawireless.com/t/ttff-on-xa1210/22117)
**Author:** [@CleberPeter](https://forum.sierrawireless.com/u/CleberPeter)\ **Replies:** 0\ **Last updated:** [November 16, 2020, 1:56pm UTC](https://forum.sierrawireless.com/t/ttff-on-xa1210/22117 "2020-11-16T13:56:04Z")
Hi, I’m using XA1210 with the firmware version: H6736.03\_UU\_8021 I connected a battery to the VBACKUP pin and I get readings every 1s perfectly. I verified in my tests that if the module is kept without the main power… --- ## [Enable I2C on XA1110?](https://forum.sierrawireless.com/t/enable-i2c-on-xa1110/21977)
**Author:** [@niobo](https://forum.sierrawireless.com/u/niobo)\ **Replies:** 0\ **Last updated:** [October 30, 2020, 9:36pm UTC](https://forum.sierrawireless.com/t/enable-i2c-on-xa1110/21977 "2020-10-30T21:36:36Z")
I thought that the XA1110 supported I2C, which the datasheets I found said. I see that later datasheets say this is ‘not enabled by default’. So how do I enable it? I have found other posts with links to firmware that ne… --- ## [NMEA GST Message on XM1110](https://forum.sierrawireless.com/t/nmea-gst-message-on-xm1110/21649)
**Author:** [@miika.ihonen](https://forum.sierrawireless.com/u/miika.ihonen)\ **Replies:** 0\ **Last updated:** [September 29, 2020, 12:01pm UTC](https://forum.sierrawireless.com/t/nmea-gst-message-on-xm1110/21649 "2020-09-29T12:01:12Z")
Is it possible the get NMEA 0183 protocol GST message (pseudo range noise statistics) as an output from XM1110? Based on brief Internet survey, some other MT3333 based GNSS module can do it with a specific firmware. Is … --- ## [XA1110 Antenna Switch Command](https://forum.sierrawireless.com/t/xa1110-antenna-switch-command/21480)
**Author:** [@jose.korneluk](https://forum.sierrawireless.com/u/jose.korneluk)\ **Replies:** 1\ **Last updated:** [September 10, 2020, 3:35pm UTC](https://forum.sierrawireless.com/t/xa1110-antenna-switch-command/21480 "2020-09-10T15:35:42Z")
On the XA1110 (MT3333 based) module is there a command to force a switch from internal to external antenna and vice versa? --- ## [XM1210 Part Numbers](https://forum.sierrawireless.com/t/xm1210-part-numbers/21452)
**Author:** [@jeremy3](https://forum.sierrawireless.com/u/jeremy3)\ **Replies:** 2\ **Last updated:** [September 8, 2020, 10:11pm UTC](https://forum.sierrawireless.com/t/xm1210-part-numbers/21452 "2020-09-08T22:11:44Z")
Hello, I’ve just built a board with an XM1210 module on it, and ran into the issue where the part that I ordered had USB+Serial firmware on it (UU) by default, rather than the I2C+Serial firmware (UI) that I needed. Is… --- ## [XM1110 SPI interrupt](https://forum.sierrawireless.com/t/xm1110-spi-interrupt/17429)
**Author:** [@shrm](https://forum.sierrawireless.com/u/shrm)\ **Replies:** 2\ **Last updated:** [August 17, 2020, 6:56am UTC](https://forum.sierrawireless.com/t/xm1110-spi-interrupt/17429 "2020-08-17T06:56:54Z")
Hello, we are working with the XM1110 GNSS receiver. The communication via uart works fine. Now we want to communicate via SPI and use the interrupt to wake up our board. We can receive SPI messages but at the interrupt… --- ## [XA1110 issues using interrupt](https://forum.sierrawireless.com/t/xa1110-issues-using-interrupt/17263)
**Author:** [@tyfridays21](https://forum.sierrawireless.com/u/tyfridays21)\ **Replies:** 1\ **Last updated:** [August 16, 2020, 5:43pm UTC](https://forum.sierrawireless.com/t/xa1110-issues-using-interrupt/17263 "2020-08-16T17:43:23Z")
Greetings, I am making a project using one of the GPS XA1110 breakout board (https://www.sparkfun.com/products/14414). The board I am using to control it is a 9DoF Razor IMU M0 that has a SAMD21 chip on it, essentially … --- ## [XA1110 Questions/Topics](https://forum.sierrawireless.com/t/xa1110-questions-topics/12512)
**Author:** [@Alex2](https://forum.sierrawireless.com/u/Alex2)\ **Replies:** 13\ **Last updated:** [July 14, 2020, 11:37am UTC](https://forum.sierrawireless.com/t/xa1110-questions-topics/12512 "2020-07-14T11:37:53Z")
I don’t see any categories for the GNSS modules, so I guess I will post this here. I have a few questions about the XA1110 and was wondering if this is in anyone’s expertise here? I am talking to the chip via UART succe… --- ## [Enable RTCM on FGPMMOPA6H](https://forum.sierrawireless.com/t/enable-rtcm-on-fgpmmopa6h/20883)
**Author:** [@maximef](https://forum.sierrawireless.com/u/maximef)\ **Replies:** 0\ **Last updated:** [July 10, 2020, 8:26am UTC](https://forum.sierrawireless.com/t/enable-rtcm-on-fgpmmopa6h/20883 "2020-07-10T08:26:56Z")
Hello everyone, I would like to enable RTCM on the FGPMMOPA6H on an Adafruit’s “Ultimate GPS Breakout”. Is it possible to do so without using the AirPrime Development Kit ? Thank you, --- ## [HL7800 output NMEA on UART0 or UART3](https://forum.sierrawireless.com/t/hl7800-output-nmea-on-uart0-or-uart3/19299)
**Author:** [@vincentkezel](https://forum.sierrawireless.com/u/vincentkezel)\ **Replies:** 3\ **Last updated:** [February 11, 2020, 4:39am UTC](https://forum.sierrawireless.com/t/hl7800-output-nmea-on-uart0-or-uart3/19299 "2020-02-11T04:39:46Z")
Hello, I am reading the datasheets before I order the HL7800-M… it’s a candidate to replace the Simcom SIM868 in my project. I need clarification on AT+GNSSNMEA command to see if it can output on a secondary serial port… --- ## [GNSS stop to work](https://forum.sierrawireless.com/t/gnss-stop-to-work/18140)
**Author:** [@anna\_lel](https://forum.sierrawireless.com/u/anna_lel)\ **Replies:** 2\ **Last updated:** [January 29, 2020, 9:18pm UTC](https://forum.sierrawireless.com/t/gnss-stop-to-work/18140 "2020-01-29T21:18:13Z")
Hi, I have a problem with the GNSS module - can’t obtain a lock GNSSSEV:3,2 or GNSSSEV:3,3. My settings: ATI9 HL7800-M.2.5.6 BHL78xx.2.5.6.1.RK\_02\_01\_01\_00\_41.20190412 2019/04/12 16:08:23 IMEI-SV: 3594160905626304 … --- ## [XM1110 I2C interface](https://forum.sierrawireless.com/t/xm1110-i2c-interface/19083)
**Author:** [@Ratlake](https://forum.sierrawireless.com/u/Ratlake)\ **Replies:** 2\ **Last updated:** [January 22, 2020, 11:47am UTC](https://forum.sierrawireless.com/t/xm1110-i2c-interface/19083 "2020-01-22T11:47:40Z")
I am trying to enable the I2C interface on the XM1110 dev board. I can connect via UART and see NMEA traffic and I can connect using SW GNSS Tool and can issue PMTK602 Query Data Port commands and get the correct respon… --- ## [XM1110\_1103886 change Baud Rate](https://forum.sierrawireless.com/t/xm1110-1103886-change-baud-rate/15879)
**Author:** [@Alex1](https://forum.sierrawireless.com/u/Alex1)\ **Replies:** 1\ **Last updated:** [January 16, 2020, 7:21pm UTC](https://forum.sierrawireless.com/t/xm1110-1103886-change-baud-rate/15879 "2020-01-16T19:21:56Z")
We’ve bought GNSS XM1110\_1103886 (Firmware AXN 5.1.1\_8252). I can’t change Baud Rate from 115 200bps (default) to 9600bps, using command $PMTK251, 9600\*17. Earlier I used FireFly (Firmware AXN 3.8\_8552) and changed Baud… --- ## [Not able to decode NMEA messages](https://forum.sierrawireless.com/t/not-able-to-decode-nmea-messages/18007)
**Author:** [@bseiz](https://forum.sierrawireless.com/u/bseiz)\ **Replies:** 6\ **Last updated:** [October 29, 2019, 11:54am UTC](https://forum.sierrawireless.com/t/not-able-to-decode-nmea-messages/18007 "2019-10-29T11:54:17Z")
Dear All, we have some GPS chips form GlobalTop on our boards, that do not send NMEA messages in text mode. The response to $PMTK605 is $PMTK705,AXN\_5.1.1\_3333\_17081700,8518,FireFly1,1.0\*74 The messages that are rece… [Next page](https://forum.sierrawireless.com/c/modules/gnss/88.md?page=1)