# XM1210 with custom 1PPS
**URL:** https://forum.sierrawireless.com/t/xm1210-with-custom-1pps/23512
**Category:** XS Series (GNSS)
**Created:** [April 22, 2021, 6:45pm UTC](https://forum.sierrawireless.com/t/xm1210-with-custom-1pps/23512 "2021-04-22T18:45:20Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@jf.rose](https://forum.sierrawireless.com/u/jf.rose)
#### Post date: [April 22, 2021, 6:45pm UTC](https://forum.sierrawireless.com/t/xm1210-with-custom-1pps/23512/1 "2021-04-22T18:45:20Z")
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 to the datasheet, the 1PPS signal on this model is only active _after being 3D fixed_, which will end up raising an alarm in our software if for some reason we loose the 3D\_Fix, hence the 1PPS.
Is it possible to order these devices with a custom firmware which would always output a 1PPS signal? It would save us from reprogramming the software which we don’t have the ownership. Thanks a lot in advance.
Have a great day and take care.
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### Author:  [@jerdung](https://forum.sierrawireless.com/u/jerdung)
#### Post date: [April 23, 2021, 4:15am UTC](https://forum.sierrawireless.com/t/xm1210-with-custom-1pps/23512/2 "2021-04-23T04:15:41Z")
Hi @jf.rose,
Following the offical document “AirPrime - XM1210 - Product Technical Specification - Rev3.0.pdf” on page [source.sierrawireless.com](http://source.sierrawireless.com), the XM1210 generates a-pulse-per-second signal (1 PPS) after 3D fixed.
So if you want a custom firmware for your XM1210 module which would always output a 1PPS signal even if your module looses the 3D\_Fix, you should contact your distributor and they will consider with this case.
Thanks,