Radiomaster ER6/ER8
 
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Radiomaster ER6/ER8

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(@serge-da-cunha)
Active Member Customer
Joined: 3 months ago
Posts: 5
Topic starter  

Dear MSH Team,

First of all thanks for your product they are top-notch. I'm really happy with the Brain 2 nevertheless, I'm switching from my old Graupner mz24 to Radiomaster TX16S and I want to have the telemetry active.

On the receiver ER8 there is a 4 pin CRSF -/+/Rx/Tx (with serial output CRSF or SBUS) I assume I have to connect the RX wire to the Sat1  but before making anything stupid I prefer to ask you the confirmation. 

Can I connect directly ? Wich type of connector is it? 

 

Thanks in advance,

Best regards


   
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(@customercare)
Reputable Member Admin Registered
Joined: 6 years ago
Posts: 1106
 

Good morning, Serge.
Have a great start to the week.
After you have connected the app with the flight control unit, selecting in panel 3 of the Wizard of our configuration app the CROSSFIRE serial communication protocol used by your receiver, in the next panel 4 of the Wizard the schematic that corresponds to the model of the flight control unit connected to the app and of the serial communication protocol you chose in the previous panel is automatically chosen and displayed.
As you can see from the diagram, the power - & + along with the RX signal should be connected to the CH3 port of the flight controller. The TX signal only of the receiver should be connected to the signal pin of the SAT1 side port (if the receiver has a second ground connector then the second ground should also be connected to the SAT1 socket otherwise the ground connected to the CH3 connector is sufficient).
CAUTION. Do not connect anything to the positive of the SAT1 connector otherwise you may damage the ECU and/or receiver.

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Picture showing where the signal pin is located in the SAT1 connector:

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Additional useful information can be found on page 14 of the PDF document "Telemetry" which you can download from the "MANUALS" section of the app or the "Downloads" section of our website or from the following link:
README_for_ESC_datas_log_and_telemetry

More information can be found in the PDF document "OpenTX / EdgeTX Integration" or from the "Downloads" section of our website or the following link:
README_for_OpenTX_EdgeTX_integration_for_BRAIN


   
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(@serge-da-cunha)
Active Member Customer
Joined: 3 months ago
Posts: 5
Topic starter  

Good Morning MSH Team,

Thanks for the reply very clear and helpfull. Can you confirm for the SAT1 port that it is a JST ZH 3pin 1.5mm type connector?

Best Regards,

Serge


   
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(@customercare)
Reputable Member Admin Registered
Joined: 6 years ago
Posts: 1106
 

Yes, it is the same one used for Spektrum satellite connectors and for the connectors of servos mounted on micromodels. It is also mounted on many of our accessory cables.


   
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(@serge-da-cunha)
Active Member Customer
Joined: 3 months ago
Posts: 5
Topic starter  

Dear BrainDev,

Everything seems working fine. I'm able to see the tx16s on the MSh Brain 2 configurator and the TX16S can connect to the module using the Brain 2 LUA.

I still have 2 questions. 

Is it possible to retrieve the RPM of the YGE controleur with the crossfire protocol?

I cannot setup any failsafe with the serial output on the ER8. Is there any failsafe on the Brain 2 side? What should I do?

Thanks in advance, best regards,

Serge

 


   
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(@customercare)
Reputable Member Admin Registered
Joined: 6 years ago
Posts: 1106
 

No, as we have already explained many times in other posts both in this forum and in other public forums and Facebook groups, the ELRS protocol was born by enthusiasts but thinking only of drones, fixed-wing models (airplanes, gliders) to boats and cars where only 4 channels (AETR) are required to be transmitted at high speed and with an extended range of values.
Unfortunately, it is not a protocol born with RC helicopters in mind as well, which require a fifth control (collective pitch) that all other radio-controlled models do not need.
Remedies to this shortcoming were later introduced, but they still have limitations compared to all other protocols (e.g., channel 5 is only used to arm drone motors and thus handles only two values: On or Off (0% or 100%), in addition, the other channels (setting for example 16 channels, are transmitted with a halved frame rate by dividing it by two).

Other limitations of this protocol are also present in the number of telemetry parameters transmitted where as you have already seen it lacks the possibility to transmit for example the RPM value which in drones is not needed (the motor speeds keep varying to stabilize the drone, but also to vary its altitude, while instead in RC helicopters it is essential that the RPM remains constant), but it lacks the possibility to transmit also many other telemetry values: Global Vibrations, ESC Temperature, Throttle Input, Power Output, Etc.

Then again, a protocol designed primarily for "long range" flight is of no use to RC ELIs where it is essential to be able to keep the model in sight and thus close to be able to constantly monitor its attitude.

Fortunately, Brain2 flight controllers have a special memory in which telemetry parameters can be recorded in flight and reviewed after landing so as to check, for example, that the RPM stabilization is working and at what RPM value the flight took place.

Finally, as for the Fail Safe management, it is directly controlled by the flight controller which in case of any problem in the signal received from the receiver takes off power to the motor so as to limit any damage to people, animals, property and damage to the model itself.
Unlike self-stabilizing models such as airplanes, with Eli RCs it is not possible to bring them back into attitude by bringing the controls to a certain position as we have already explained in the answer to question #28 in the FAQ section of our website:
https://www.msh-electronics.com/faq/#Q28

If with ELRS protocol you want to get the best performance for Eli RC you have to use as Packet Rate 333Hz Full and as Switch Mode 8 channels or use D250 as Packet Rate,
Also, since in Eli RCs the Throttle signal is almost always kept on a constant value to allow the governors to work properly (whether the Governor is managed by the ESC or the flight controller, it does not change) it might be useful to use channel 3 for collective pitch control and channel 6 for Throttle control.
Finally, since channel 5 can only take on two values, the management of tail gain control you can do in software or by using another radio channel other than 5 for ARM control.


   
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(@serge-da-cunha)
Active Member Customer
Joined: 3 months ago
Posts: 5
Topic starter  

Dear BrainDev,

Thank you,  everything is much more clear now.  Sorry that you had to repeat here what you already told a few times. 

Last question and I hope this one is not so commun. What is the best protocol you adbvice to use between Brain 2 and TX16S (including telemetry, TX brain 2 configurator, etc.).  

Best regards,

Serge


   
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