Replies to This Discussion

Permalink Reply by Alberto Cristóbal Granda on November 22, 2012 at 9:55am

Dear Andras,

I bought a couple of 868MHz module and I don´t know how to make them work

Could you please help me.

I put every module in a litle text board this board is attached to a normal FTDI Basic 

I conected this way

FTDI         Module

VCC         3,3V regulator  VCC

GND         GND

TX            Rx

Rx           Tx

DTR         NONE

CTS         NONE

I have send some sentences from a Hyperterminal Program connecting  @ 9600bps with the Com port (USB) and @57600  and they work, I know because I put a bridge ai the air module Tx-Rx and I receive at the computer the same sentence I write.

BUTTT.

When I try to connect them to the 3DRadio Config program and there is no way of connecting them

Could you please tell me some advice.

Thanks

Alberto

 

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Permalink Reply by Andras Schaffer on November 22, 2012 at 10:21am

Hi,

HM-TRP modules are work as a transparent comm module by default, BUT they are NOT 3DRadio modules. To use them as a 3DRadio module, you have to program the appropriate bootloader and the firmware. To do that you need a C2 programmer (to program SiLabs uProc).

Regards,

    Andras

 

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Permalink Reply by Alberto Cristóbal Granda on November 22, 2012 at 2:00pm

Thanks Andras.

I undertand I can make a very good modems with the bootloader and the firmware.

I have been using APC220 433 radio modems. but I would like to fly with 433 RC and I would like to use these modems. When I used the APC 220 I think they do not have very much programming  because the only parameters I changed were the baud Rate (to the comuter and drone and the wireless one.

I would like to try these modems with the APM 1.4 and a Mikrokopter (I was using the APC also)

I would like to program  just the baud rate as 57600 ground and wireless but when I try I thnik I did something wrong.

I type the sentence

AA FA C3 00 00 E1 00 to change the wireless baud rate (57600) and the module record this parameter

When I type the nest sentence, 

AA FA C3 00 00 E1 00  to change the UART baud rate (57600) I could not talk to the module anymore.

I did a new connection with 57600 baud rate but it does not answer the correct thinks.

I am not very clever in programing and electronics, but I would like to do it.

Could you please tell me some tip to make then work.

Thanks a lot

Alberto

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DeveloperPermalink Reply by Andrew Tridgell on November 22, 2012 at 3:33pm

Hi Andras,

After seeing this posting I have added the 470MHz and 868MHz register tables to the SiK firmware. If you update to the latest 3DR radio firmware you will get full support for your 868MHz radio.

Cheers, Tridge

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Permalink Reply by Minh on December 4, 2012 at 5:05am

Hi Andrew,

Can this update be done with a bootloader and .hex image? I don't have the programmer and would like to change frequencies...

Cheers,

Minh

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DeveloperPermalink Reply by Andrew Tridgell on December 4, 2012 at 2:30pm

Hi Minh,

Can this update be done with a bootloader and .hex image? I don't have the programmer and would like to change frequencies...

If you mean you have a 915MHz radio and want to run it at 868MHz, then for it to really work well you'd need new hardware. The 868 modules have a different analog stage than the 915 modules. If you run the 915 radios at 868 you will lose a lot of your signal (somewhere around 80% loss).

If you want to run a 915 radio at 868 anyway and don't mind the signal loss then you don't need a firmware change. Just configure it for 868MHz. I deliberately set the range of allowed frequencies for the 915 radios to include the 868 band, in case people wanted to do this despite the large loss.

Cheers, Tridge

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Permalink Reply by Minh on December 4, 2012 at 4:53pm

Thanks Tridge,

I might as well give it a go and see how much of a problem it is. I'm guessing it will limit the air rate mostly? 

Anyhow it doesn't save the config. I must have the wrong firmware version. Is there a binary file I can download from somewhere? 

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