This page is relevant to the following transmitters:
* FlySky TH9X
* Turnigy 9X, Turnigy 9XR
* EURGLE
## Features
The DIY Multiprotocol module can be used in the Flysky family of transmitters in either PPM mode or in Serial mode. To operate in Serial mode, a version of er9X supporting the DIY Multiprotocol must be installed on the Tx. If your transmitter is running an earlier firmware that is not Serial enabled, and if you wish to run in Serial mode jump down to the section [Enabling Serial Mode]
## PPM Mode
Please refer to the [PPM Setup](PPM_Setup.md) page.
## Serial Mode
Serial mode is only supported by the er9X firmware. Loading this firmware is beyond the scope of this document but it is well covered in tutorial and video tutorials online.
###Enabling Serial Mode
1. Confirm that the DIY Multiprotocol module has the required physical connections between the pins on the back of the Tx and the ATMega328 microprocessor. This may require some soldering and depends on which version of the DIY Multiprotocol module you have. Check out your module’s hardware page under the section [Enabling your module for Serial](### insert link) for details.
1. Plug in your DIY Multiprotocol module into the transmitter module bay. If you have a rotary protocol selection switch, turn the switch to position 0 to put the unit into Serial mode.
1. Ensure throttle is down and all switches are in the start position and power up the Tx. The red LED on the DIY Multiprotocol module should be flashing with a period of about 1 second indicating that it has not established a valid serial link with the Tx. This is expected as we have not set up the Tx yet.
1. The red LED on the DIY Multiprotocol module should briefly flash and then go off. This confirms that the DIY Multiprotocol module has established serial communication with the Tx. If the red LED on the module continues to flash at a period of about 1 seconds then it signals that serial communication has not been established. Check your settings under the model menu as described above and check that the protocol selection switch on the module is at 0 (enable Serial mode). If there is still no communication, power down and power up the Tx. Finally check that you have correctly enabled your module for serial as described on the hardware page for your module under the heading [Enabling your module for Serial](### insert link)
###Protocol Selection in Serial mode
To select the protocol:
1. In the Model Setting menu, scroll through the available options under the MULTI option {mikeb to confirm}.
1. Depending on which protocol you have selected you may be required to select a sup-protocol and options. For example, the FrSky protocol has three sub-protocols FrSky_V, FrSky_D and FrSky_X. In some cases the sub-protocols have options that could specify the number of channels, packet frame rate or fine frequency tuning. Check out the [Protocol Details](Protocol_Details.md) page for detailed information and suggestions regarding the sub-protocols and options.
1. Switch on the model or put the receiver into bind mode
1. On the transmitter go to the Model Settings menu and scroll down to the [Bind] menu option and press Enter.
1. Press Enter again to exit Bind mode
For many consumer models consider checking the Autobind option. This will initiate the bind sequence as soon as the module is powered up by the transmitter.
If you are struggling to get a bind please see the [Getting the bind timing right page](Bind_Timing.md)
