# Parallel USB reading

**URL:** <https://forum.realdash.net/t/parallel-usb-reading/452>\
**Category:** Bugs and troubleshooting\
**Created:** [April 18, 2020, 12:19pm UTC](https://forum.realdash.net/t/parallel-usb-reading/452 "2020-04-18T12:19:15Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Artem\_59](https://forum.realdash.net/user_avatar/forum.realdash.net/artem_59/32/13_2.png) [@Artem\_59](https://forum.realdash.net/u/Artem_59)\
**Post date:** [April 18, 2020, 12:19pm UTC](https://forum.realdash.net/t/parallel-usb-reading/452/1 "2020-04-18T12:19:15Z")

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There is a need in parallel with RealDash to read the same port by another program (I write the program), and analyze incoming packets. But RealDash blocks this possibility. How can I fix this? Maybe the settings in my program, but what are they? If you can help, I would be grateful

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**Author:** ![realdashdev](https://forum.realdash.net/user_avatar/forum.realdash.net/realdashdev/32/6_2.png) [@realdashdev](https://forum.realdash.net/u/realdashdev)\
**Post date:** [April 18, 2020, 12:56pm UTC](https://forum.realdash.net/t/parallel-usb-reading/452/2 "2020-04-18T12:56:50Z")

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I don’t believe there is nothing much RealDash can do about it as Serial ports are typically reserved for the ones that open them. There are no ‘3-way’ serial connections. There are some software that can sniff the traffic on driver level, I don’t know if they would help you on your case.

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**Author:** ![Artem\_59](https://forum.realdash.net/user_avatar/forum.realdash.net/artem_59/32/13_2.png) [@Artem\_59](https://forum.realdash.net/u/Artem_59)\
**Post date:** [April 18, 2020, 1:20pm UTC](https://forum.realdash.net/t/parallel-usb-reading/452/3 "2020-04-18T13:20:19Z")

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If RealDash doesn’t work, my program works, but as soon as RealDash connects the device, my program can no longer receive signals. But my program was connected to the port first. Why is that? Tutu is more a question of code

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**Author:** ![Artem\_59](https://forum.realdash.net/user_avatar/forum.realdash.net/artem_59/32/13_2.png) [@Artem\_59](https://forum.realdash.net/u/Artem_59)\
**Post date:** [April 18, 2020, 6:27pm UTC](https://forum.realdash.net/t/parallel-usb-reading/452/4 "2020-04-18T18:27:43Z")

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In the process of studying parallel operation, I saw that after a while, there is no data in the UART buffer. And my program is slowing down. But for some time our programs are running in parallel.  
What does RealDash do with data from the port that it disappears? Help please

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**Author:** ![realdashdev](https://forum.realdash.net/user_avatar/forum.realdash.net/realdashdev/32/6_2.png) [@realdashdev](https://forum.realdash.net/u/realdashdev)\
**Post date:** [April 19, 2020, 6:07am UTC](https://forum.realdash.net/t/parallel-usb-reading/452/5 "2020-04-19T06:07:25Z")

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Honestly, I do not understand what you are trying to achieve. We do not have resources to help on such custom one-off scenarios.