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# Compatible Transmitters
There are two different options for the interface between the MULTI-Module and the transmitter: PPM and Serial. The considerations are different for each.
There are two different modes to interface the MULTI-Module and the transmitter: PPM and Serial. The considerations are different for each.
- **PPM** is more generic, easy to implement and will work with most transmitters.
- **Serial** requires custom firmware on the transmitter but brings added functionality including protocol selection through the Tx interface and the option of telemetry (with the right transmitter firmware).
Any Tx that provides a PPM output (like a trainer port, or a transmitter with a RF module bay) is compatible with the MULTI-module. In practice, most of the documentation on this site is focused on building modules that slip into your transmitter’s module bay.
Any Tx providing a PPM output (like a trainer port, or a transmitter with a RF module bay) is compatible with the MULTI-module.
##PPM
The DIY Mulitprotocol module supports industry standard PPM interface that works with all transmitters with either a module bay, and/or a trainer port. Even the older 72MHz FM radios support this standard.
When using the standard PPM Tx output, the protocol selection is achieved through a 16 position rotary switch on the module. This enables 15 protocol/sub-protocol/options combinations to be selected. Binding is achieved by pressing a bind button on the back of the module (see picture below)
When using the standard PPM Tx output, the protocol selection is achieved through a 16 position rotary switch on the module. This enables 15 (0=serial) protocol/sub-protocol/options combinations to be selected. Binding is achieved by pressing a bind button on the back of the module (see picture below)
<img src="images/4-in-1_Module_PPM_Controls.jpg" width="150" height="180" />
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Transmitter|Firmware Options|Telemetry Enabled
:----------|:---------------|:----------------
[FrSky Taranis/Plus/9XE](Tx-Taranis.md)| erSky9x, OpenTx 2.1.8 Multi|Yes - native
[Turnigy 9X/9xR](Tx-FlyskyTH9X.md)|er9x|[Mod required](#Telemetry_Mod), No DSM telem
[FrSky Taranis/Plus/9XE](Tx-Taranis.md)| erSky9x, OpenTx 2.1.9 Multi|Yes - native
[Turnigy 9X/9xR](Tx-FlyskyTH9X.md)|er9x|[Mod required](#Telemetry_Mod)
[Turnigy 9XR-Pro](Tx-erSky9X.md)|erSky9x|Yes - native
[FrSky TH9x](Tx-FlyskyTH9X.md)|er9x|[Mod required](#Telemetry_Mod), No DSM telem
[FlySky TH9x](Tx-FlyskyTH9X.md)|er9x|[Mod required](#Telemetry_Mod)
[SKY board](Tx-erSky9X.md)|erSky9x|Yes - native
[AR9X board](Tx-erSky9X.md)|erSky9x|Yes - native
[9Xtreme board](Tx-erSky9X.md)|erSky9x|Yes - native
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##Other Notes:
- er9X and erSky9X firmware already supports Multiprotocol Module as a standard feature. At time of writing it looks like that the next major release of OpenTx - OpenTx 2.2 - will have DIY Mulitprotocol support as a standard feature.
- er9X and erSky9X firmware already supports Multiprotocol Module as a standard feature. The next major release of OpenTx - OpenTx 2.2 - will have DIY Mulitprotocol support as a standard feature.
- Owners of Walkera Devo transmitters should look at the [Deviation-Tx](http://www.deviationtx.com) project for how to achieve the same end goal with your transmitters.
- To enable telemetry on a Turnigy 9X or 9XR you need to modify your TX [read this.](#Telemetry_Mod).
- DSM telemetry is not available on er9x due to a lack of flash space.
- Enabling telemetry on a 9XR PRO and may be other TXs does not require any hardware modifications. The additional required serial pin is already available on the TX back module pins.
- Once the TX is telemetry enabled, it just needs to be configured on the model (see er9x/ersky9x documentation).