# SIM7600 Uart Pulses

**URL:** <https://community.sparkfun.com/t/sim7600-uart-pulses/67482>\
**Category:** Development Platforms\
**Created:** [December 3, 2025, 12:55am UTC](https://community.sparkfun.com/t/sim7600-uart-pulses/67482 "2025-12-03T00:55:55Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Oily](https://avatars.discourse-cdn.com/v4/letter/o/e56c9b/32.png) [@Oily](https://community.sparkfun.com/u/Oily)\
**Post date:** [December 3, 2025, 12:55am UTC](https://community.sparkfun.com/t/sim7600-uart-pulses/67482/1 "2025-12-03T00:55:56Z")

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The device does not respond to AT commands.

All that happens is the Uart output goes to 0V for 45 mS about every 3 seconds.

I can not find any information in the data Pdf or any application documents.

Does anyone know what it means?

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**Author:** ![TS-Russell](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-russell/32/6092_2.png) [@TS-Russell](https://community.sparkfun.com/u/TS-Russell)\
**Post date:** [January 24, 2026, 1:40am UTC](https://community.sparkfun.com/t/sim7600-uart-pulses/67482/2 "2026-01-24T01:40:52Z")

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Can you share a photo of the soldering/wiring?

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<div class="post-metadata">

**Author:** ![Oily](https://avatars.discourse-cdn.com/v4/letter/o/e56c9b/32.png) [@Oily](https://community.sparkfun.com/u/Oily)\
**Post date:** [January 25, 2026, 2:40am UTC](https://community.sparkfun.com/t/sim7600-uart-pulses/67482/3 "2026-01-25T02:40:47Z")

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Thanks for your reply.

I will not be using this module in this project so I will close this topic.

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<div class="post-metadata">

**Author:** ![TS-Russell](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-russell/32/6092_2.png) [@TS-Russell](https://community.sparkfun.com/u/TS-Russell)\
**Post date:** [January 26, 2026, 11:33am UTC](https://community.sparkfun.com/t/sim7600-uart-pulses/67482/4 "2026-01-26T11:33:33Z")

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