# Serial Fathom S speed

**URL:** <https://discuss.bluerobotics.com/t/serial-fathom-s-speed/1823>\
**Category:** Communication Interfaces\
**Tags:** fathom-s\
**Created:** [December 4, 2017, 3:34pm UTC](https://discuss.bluerobotics.com/t/serial-fathom-s-speed/1823 "2017-12-04T15:34:28Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![NIW](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/niw/32/1904_2.png) [@NIW](https://discuss.bluerobotics.com/u/NIW)\
**Post date:** [December 4, 2017, 3:34pm UTC](https://discuss.bluerobotics.com/t/serial-fathom-s-speed/1823/1 "2017-12-04T15:34:28Z")

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Is the serial over 200m on fathom s real time or is there lag? I am communicating between 2 raspberry pis. I am wondering if i could send motor control over signals over it.

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**Author:** ![jwalser](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/jwalser/32/2234_2.png) [@jwalser](https://discuss.bluerobotics.com/u/jwalser)\
**Post date:** [December 4, 2017, 3:49pm UTC](https://discuss.bluerobotics.com/t/serial-fathom-s-speed/1823/2 "2017-12-04T15:49:56Z")

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It is real time, and it can be used for motor control signals.

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**Author:** ![paul-unterweiser](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/paul-unterweiser/32/697_2.png) [@paul-unterweiser](https://discuss.bluerobotics.com/u/paul-unterweiser)\
**Post date:** [December 4, 2017, 4:24pm UTC](https://discuss.bluerobotics.com/t/serial-fathom-s-speed/1823/3 "2017-12-04T16:24:00Z")

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The Fathom-S boards use RS 422 communications: [Fathom-S Usage Guide](http://docs.bluerobotics.com/fathom-s/)

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**Author:** ![NIW](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/niw/32/1904_2.png) [@NIW](https://discuss.bluerobotics.com/u/NIW)\
**Post date:** [December 4, 2017, 6:48pm UTC](https://discuss.bluerobotics.com/t/serial-fathom-s-speed/1823/4 "2017-12-04T18:48:40Z")

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Thanks!

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**Author:** ![NIW](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/niw/32/1904_2.png) [@NIW](https://discuss.bluerobotics.com/u/NIW)\
**Post date:** [February 2, 2018, 7:22pm UTC](https://discuss.bluerobotics.com/t/serial-fathom-s-speed/1823/5 "2018-02-02T19:22:56Z")

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I was wondering, because the pi works on 3.3v and the fathom-s works on 5v I would need to use a logic level converter, ([https://www.sparkfun.com/products/12009](https://www.sparkfun.com/products/12009)) would this affect speed?

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**Author:** ![paul-unterweiser](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/paul-unterweiser/32/697_2.png) [@paul-unterweiser](https://discuss.bluerobotics.com/u/paul-unterweiser)\
**Post date:** [February 2, 2018, 7:26pm UTC](https://discuss.bluerobotics.com/t/serial-fathom-s-speed/1823/6 "2018-02-02T19:26:08Z")

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The Fathom S doesn’t use a Raspberry Pi, it connects directly to the Pixhawk: [Fathom-S Usage Guide](http://docs.bluerobotics.com/fathom-s/)

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**Author:** ![NIW](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/niw/32/1904_2.png) [@NIW](https://discuss.bluerobotics.com/u/NIW)\
**Post date:** [February 4, 2018, 1:55pm UTC](https://discuss.bluerobotics.com/t/serial-fathom-s-speed/1823/7 "2018-02-04T13:55:19Z")

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I am using a serial connection between the pi’s over the cable using the fathom s. Not connecting it to a pixhawk