Telemetry 4pin vs 6pin Connection To Holybro 6C Controller

ArduCopter
1

I want to add telemetry to my Holybro 6C equipped quadcopter. I found a promising product on Amazon, but it did not specifically indicate compatibility with the 6C FC, so I asked the chat bot, and it responded with yes, it is compatible. Based on this I ordered it. When it arrived, I discovered that there is no interconnecting cable with a JST-GH connector needed to plug into the controller.

I have a spare cable with the JST-GH connector and I can splice it to one of the supplied cables, but there are only four wires as opposed to six that I see in the Holybro connection diagram picture, which shows a red (power) and five black wires while the supplied cables have a five pin connector: red, green, yellow, unused, and a black wire at the end.

Do you think I can get it to work if I splice the four wires into the corresponding pins of the 6 pin connector? Or should I just try to return it and order one from Holybro?

2

You only need the +5v (red) 0v (black) and the two data wires TX and RX.
Set the correct serial port to Mavlink2
SERIAL5_PROTOCOL,2 (Telem3)
and set the baud rate to match the telemetry radios, probably 57600

3

Thank you. I will lgo ahead and splice the wires and try it out. Thanks again for confirmation!

4

Also Tx on the radio goes to Rx on the flight controller, and Rx to Tx.

5

I wasn’t sure which wire was gnd on the six pin connector but I found a pinout for the connector and I have spliced the wires and connected - the two extra wires are CTS and RTS which I snipped off. I tested it out and it connected to Mission Planner. But I’m getting a “fence requires position” error - I may have to recalibrate the imu and compass. I need to get a telemetry module for my other Tarot - I may search for a Holybro six pin setup so I won’t have to mess with splicing wires.

Thanks again for your assistance!

6

It’s poor position from GPS.

7

You are correct. It was interfering with the GPS and I repositioned it. Instead of being mounted at the rear on the top deck, I installed it opposite the GPS on the middle deck with the antenna pointed down:

Telemetry Added
Telemetry Added1920Ă—1440 636 KB

8

What telemetry unit is that? It’s not that common that the telemetry radios interfere with GPS.

9
10

Ah OK. Many of those radios that claim 500mw have been reported to be very noisy (out of band emission). There are posts on the forum here if you care to look for them. I don’t have any problem with this setup using the reference standard radio. Which are still available from 3DR (Mro) for a bit more $$

Radio
Radio320Ă—274 19.5 KB

1 Like
11

Secure the GPS wire to the GPS mast. That will help prevent both from vibrating.

12

Thanks. Will do. I have two Tarot quads - will secure both.

13

When I order a telemetry unit for my other quad I will probably order it from Holybro to make sure that it has the six pin connector and lower power. Thanks for the info. Now I have to decide whether to keep this one or replace it.

14

Give it a try but anecdotal evidence suggests it may have less or equal range not more than the 100mw standard unit.

15

I have a knock off that’s so noisy I have to keep it 6 feet from the GCS laptop to even use the laptop. I quit using it.

16

To be honest, I didn’t pay attention to the power output when I ordered it. I was more concerned about connector compatibility with my Pixhawk. I may try it out on a flight once the weather cooperates - I may indeed replace it.