Quick question... uart speed

[s_mack]

Does anyone know what the data rate is for the FRSky mod? Thanks.

- Steven

[GrootWitbaas]

I may be wrong, but I think its 9600.

[s_mack]

ok, would that be 9600 baud or 9600bps?

Let me put it another way... can I be confident that the data is flowing at something slower than 400kbps?

[erazz]

Pretty sure it's 9600 baud....

Are you doing a V2 with on board RS232? Would be awesome!!!

Just need to figure out how to do the mod to move the two lines without soldering... Now there's a challange for ya!

[s_mack]

I think I figured out how we can do it without the 2 lines at all. I'm limited to 400Kbps but that should be more than enough. Baud is instructions per second and there can be several bits in an instruction depending on the modulation. I can't imagine it being so high its going to come even close to 400k though.

I really have ZERO experience with the FrSky. Could you guys give me links to the items I need for testing? Honestly I don't even know what equipment you guys are using.

[GrootWitbaas]

Steven, not sure what the others use. I barely had time to install mine, never mind test it all, but what I got is this:
For Module I used this (I wanted something I can build inside the TX, but there is also a plug and play one full kit)
For RX I got this with Telemetry and this for ppm sum (8CH) or standard 4ch pwm

Lots of information can be found here
Hope that helps a bit

Groot

[s_mack]

A bit, thanks. I'm still confused. What info is sent if there's no sensors or anything?.

The Frsky site is down at the moment. From what I recall, it was horrible English anyway and I couldn't be confident in what I was reading.

[jhsa]

their site is working

http://www.frsky-rc.com/

[MikeB]

The FrSky telemetry operates at 9600 baud, normal asynchronous serial data, 8 data bits in each 10 bit frame. The actual underlying data rate is less than this, ypu cannot send data in to the receiver at 9600 baud, and expect it all to arrive at the transmitter.
If the receiver is off, you receive NO data.
If the receiver is ON, you get a 'standard' data frame (about 11 bytes) containing the A1 and A2 analog values, and the two RSSI values several times per second.
If you send an alarm set frame, or an alarm request frame, you receive a status frame back.
If you have a hub connected you get 'hub' frames several times per second in addition to the 'standard' frame described above.

Mike.

[s_mack]

Thanks Mike.