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edgetx/docs/development/external-module-protocols.md
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2026-08-03 16:37:20 +08:00

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# External Module Protocols
# PPM
![PPM protocol waveform](../assets/images/PPM.png)
# PXX (FrSky XJT)
![PXX protocol waveform](../assets/images/PXX.png)
# ACCESS (FrSky RM900 ACCESS)
![ACCESS protocol waveform](../assets/images/ACCESS.png)
# DSM2 (Spektrum hacked module)
125000 bauds 8N1 - No parity
![DSM2 protocol waveform](../assets/images/DSM2.png)
# SBUS (Normal mode)
100000 bauds - Inverted - Even parity
![SBUS Normal protocol waveform](../assets/images/SBUS%20Normal.png)
# Multimodule
100000 bauds - Even parity - 2 stops bit
![MULTI protocol waveform](../assets/images/MULTI.png)
# Crossfire
400000 bauds (or reduced depending on radio capabilities) - Inverted
![XFIRE protocol waveform](../assets/images/XFIRE.png)