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Jul 26, 2016, 10:21 PM
Zippa Flippa
nebbian's Avatar
Thread OP

Banggood Multiprotocol module (Flysky Frsky Devo DSM2)

This thread is intended as a quick start for the users who are trying to get their Banggood multiprotocol TX module working.

The item is located here:

The thread that started it all off is here:

The Github repository is here:
Last edited by nebbian; Jul 27, 2016 at 03:21 AM.
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Jul 26, 2016, 10:22 PM
Zippa Flippa
nebbian's Avatar
Thread OP
Quick start:

* Turn the switch to the 0 position
* Solder the two jumpers marked "Tx" and "Rx"
* Insert into your Taranis, ensuring that you have the antenna lead and antenna rubber ducky part connected
* Update firmware in Taranis to this version:
* Turn on your Taranis, and make a new model. In the menu turn the internal RF module off, and set the external module to be "Mult". Then you can select which protocol to use.
* Set your receiver to bind mode
* In the Taranis menu, press the "Bind" option. You should now be bound.
Last edited by nebbian; Jul 26, 2016 at 10:46 PM.
Jul 26, 2016, 10:23 PM
Zippa Flippa
nebbian's Avatar
Thread OP

Banggood Multiprotocol module (Flysky Frsky Devo DSM2)

3D Printed Case:

Attached are some details of a case that I've modelled up. It seems to work well.

You shouldn't need support to print this, both parts should print as-is. I used black ABS, which matches the case of the Taranis.

When assembling, you need to insert the module PCB at an angle. Angle the right hand edge of the PCB into the case, and when it's at the bottom, rotate the left hand edge down into the case as well. It shouldn't need forcing.

You can download the files from here:

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Updating the module firmware:

Here is a video showing the entire process (thanks k3nv!)
Updating BangGood 4in1 multi protocol tx module firmware frsky taranis turnigy 9xr pro (16 min 53 sec)

Important: Do not power your module with 5V! Doing so will damage your module!
Do not use a 5V programmer, even if powering the module from another source.
Your programmer must be capable of toggling the signal lines with 3.3V.

Firstly, make sure your programmer is not blasting 5V into the module.

On my UsbTinyISP this meant removing a jumper.

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Then, solder in a 6 pin header into your module board.

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Now, whenever you want to power up the module, you do so with it inside your radio and your radio having a model selected that uses the 'external' module.

The ISP programmer will then be connected to your computer and the board, with the programmer powered by your USB connection, and the board powered by your radio.

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Once you have this connection, it's a good idea to download the existing firmware and eeprom so you can go back to a known good state if things stop working.

# download your existing firmware:
avrdude -c usbtiny -p m328p -U flash:r:"orig_flash.hex":i

# download  eeprom:
avrdude -c usbtiny -p m328p -U eeprom:r:"orig_eeprom.hex":i
Thanks to hpnuts, here are some instructions on how to set up your arduino environment.

Firstly, locate your boards.txt file, and append this to the end of it:

## Multi 4-in-1 (3.3V, 16 MHz) w/ ATmega328
## -------------------------------------------------- 4-in-1


multi.bootloader.lock_bits=0x0F (3.3V, 16 MHz)

Then, in the Arduino IDE, do the following once:
  1. Tools->Board->Multi 4-in-1
  2. Tools->Programmer->USBasp (or whatever programmer you are using)
  3. Tools->Burn Bootloader => this will update the fuses to the correct values, you can ignore the error about the missing bootloader...

If step 3 produces an error saying that 0x05 doesn't match 0xfd, then this is due to the varying ways of reporting fuse bits that don't exist. Change the extended fuse line in boards.txt to this: fuses=0x05

Then retry step 3.

Now, download the latest code from
and open this up in Arduino.

You will need to modify _config.h, because there is more code in this repo than will fit on the module. You need to comment out a couple of protocols that you're not using. This is how I modified my config.h:

//There are 4 RF components supported. If one of them is not installed you must comment it using "//".
//This is also a quick way to reduce the number of protocols and save Flash space.
#define A7105_INSTALLED
#define CYRF6936_INSTALLED
#define CC2500_INSTALLED
#define NFR24L01_INSTALLED

//Bellow is the list of all available protocols. Comment the protocols you are not using with "//" to save Flash space.

//#define J6PRO_CYRF6936_INO
#define SFHSS_CC2500_INO
Also, if you are using a Taranis, then you need to invert the telemetry as shown:

//Uncomment to invert the polarity of the telemetry serial signal.
//For ER9X and ERSKY9X it must be commented. For OpenTX it must be uncommented.
Now you should be able to choose "Upload using programmer", and a minute or so later the process should finish. This means that you'll have a fully up to date module, with the protocols you are interested in.
Last edited by nebbian; Jan 13, 2017 at 03:15 AM.
Jul 26, 2016, 10:24 PM
Zippa Flippa
nebbian's Avatar
Thread OP

Technical info

Known to work without modification:
  • Hobbyking HK-TR6A V2 6ch [Mult Flysky Std, or dial 1]
  • Frsky D4R-II 8ch [Mult Frsky D8] (No telemetry)
  • Orange Rx DSM2 6ch [Mult DSM2 DSM2]
  • Eachine H8 quad [Mult Bayang]

Known to not work with:
  • Orange Rx FASST 8 ch

OpenTX status

OpenTX 2.1

- Unofficial version
- Source available under
- Binaries available under
- Telemetry is now working
- Companion 2.1.8 will overwrite multi settings. 2.19 Companion (and current nightlies) will not overwrite setting but also do not show the settings

OpenTX 2.2

- current development version of OpenTX, not for normal users
- Multi serial support in official OpenTX repository
- Telemetry working and Spektrum (DSM2/DSMX) telemetry implemented
- Works on Horus and Taranis

ER9X status

- Supports this module

ERSky9X status

- Supports this module

PPM Mode (not serial)
PPM Mode can be selected by turning the dial to one of the following options. Note that you also need to select a matching protocol inside your model selection in your transmitter (ie don't use the "Mult" option, select the protocol that matches the dial position).
Last edited by nebbian; Sep 11, 2016 at 08:17 PM.
Jul 26, 2016, 10:49 PM
Zippa Flippa
nebbian's Avatar
Thread OP

I was excited to receive this board. I'd been following the parent thread off and on for a few months, and jumped at the chance to try this board out.

Initially I was a bit frustrated at the lack of documentation. The relevant parts of information needed are scattered throughout many pages of the parent thread, and I found it difficult to find what I needed to get this up and running. This caused me to create this thread

Once I had it figured out though, the setup was quite straightforward. I had it bound to a receiver within minutes of plugging it into my Taranis. This was in the simple mode of just moving the dial to the right position for my receiver. After doing this I found out how to use the serial mode, and so updated my Taranis to a version of OpenTX that supported the module.

Now that it's all set up I'm going to use the Taranis as my main radio, and retire my ageing Turnigy 9x. That 9x doesn't owe me a thing, I've had many years of fun with that radio... but this module enables me to fly all my models without having to change modules.

I'm yet to try some range tests, but I'm sure that it will be fine for my use.

I hope this thread helps others who are in the same situation as I was in, a week or two ago.
Last edited by nebbian; Jul 30, 2016 at 09:20 AM.
Jul 27, 2016, 02:00 AM
Registered User
How many channels are supported? I am using a Taranis Plus if it matters.
Also, will this fit in a Spektrum DM9 case?
Jul 27, 2016, 02:13 AM
Happy FPV flyer
Kilrah's Avatar
Depends on the chosen protocol, and I reckon no due to the bind switch (although it can be removed when using serial mode). Who knows about the shape.
Jul 27, 2016, 02:39 AM
Registered User
Most likely using serial mode for DSMX and FrSky.
Jul 27, 2016, 02:46 AM
Registered User
It this module supported in ersky9x ?
Jul 27, 2016, 03:31 AM
Zippa Flippa
nebbian's Avatar
Thread OP
Originally Posted by renatoa
It this module supported in ersky9x ?
I believe it is fully supported:
Jul 27, 2016, 04:11 AM
Banggood Staff
Looks great!
Jul 27, 2016, 04:52 AM
ErskyTx Developer
Mike Blandford's Avatar
Originally Posted by renatoa
It this module supported in ersky9x ?
Yes, and a 'bit bashed' serial receive driver is included to handle the non-inverted telemetry on the SKY board, AR9X board, Taranis and 9Xtreme. The 9XR-PRO has a programmable inverter so also handles non-inverted serial input anyway.

Jul 27, 2016, 04:55 AM
Registered User
Are the resistors no longer needed? I thought I read that in the other thread.
Last edited by westphill24; Jul 27, 2016 at 05:04 AM.
Jul 27, 2016, 05:31 AM
eat, sleep, 3D...
Originally Posted by westphill24
Are the resistors no longer needed? I thought I read that in the other thread.
same question, some thread say need resistor for short that two point.
Jul 27, 2016, 05:35 AM
Zippa Flippa
nebbian's Avatar
Thread OP
Originally Posted by westphill24
Are the resistors no longer needed? I thought I read that in the other thread.

I think that the resistors are already present on the latest banggood board. You can see them in my picture on post 2. I only bridged the two pads with solder and the system is working fine.

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