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docs: create reference/Interface_Protocol
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title: Interface Protocols
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description:
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published: true
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date: 2021-07-29T18:45:18.652Z
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tags:
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editor: markdown
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dateCreated: 2021-07-29T18:45:18.652Z
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---
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# Interface Protocols
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> This information is intended for Advanced users ,a typical user does not need to have an understanding of the protocols used by the Interfaces in order to use Speeduino.
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{.is-warning}
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Speeduino can be interfaced to via several ways.
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1. USB
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2. Secondary Serial
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3. Canbus (MCU dependant)
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## 1. USB
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This is the primary interface and the way in which TunerStudio connects to Speeduino in order to program/configure its settings.
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## 2. Secondary Serial
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The Secondary Serial interface enables an external device to access data from Speeduino or to expand the io of the Speeduino ECU.
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A full explanation of the features and operation of secondary serial can be found here. [Secondary_Serial_IO_interface](/en/Secondary_Serial_IO_interface)
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## 3. CanBus
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Canbus is only available directly on Teensy and STM32 MCU based Speeduino. Mega2560 based units need additional hardware such as DxControl GPIO .
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A full explanation of the features and operation of secondary serial can be found here.
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[Canbus_Support](/en/Canbus_Support2)
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