View Facet rtk radius corrections data in Tera Term?

GPS/GNSS Development Boards
1

I want to see my Facet radio rtk corrections data on pc in Tera term if possible. Although it is garbled text, only to see that data arrives on the PC.

The output is ttl and I pass it to rs232 with a converter based on max3232. It is powered from the voltage output of the Facet’s radio port with the supplied cable itself.

A red LED lights up in the converter when the Facet sends corrections.

Then connect it to PC with a ch340 based rs232-usb converter.

In tera term I get the connection and I put the correct radio speed but I don’t see anything on the screen.

I appreciate if you inform me if what I am doing is nonsense or I am simply making a mistake.

Regards

2

A CH340 based RS232 to USB converter should work fine. Be sure to connect to the ‘RADIO’ port as this is the port that outputs RTCM when in Base mode.

3

I managed to have data in Tera Term.

The strange thing is the following:

  1. I connect only ground wire and green TX wire to the ttl-rs232 converter. Then to the rs232-usb converter and I have data in Tera Term.

The ttl-rs232 converter turns on a flashing led

  1. I assumed that I had to give VCC 5 volts and I did it from the red wire of the Facet’s radio port and the signal stopped.

I remove the 5 volt power supply and it reappears on the screen.

Ask:

Is it necessary to feed the ttl-rs232 converter with 5 volts?

Or just the ground and tx connections are enough?

4

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Screenshot 2023-02-09 at 23-05-04 conversor ttl rs232 - Buscar con Google.png

5

Most ttl-rs232 or ttl-uart converters are powered from the USB bus. The 5v on these converters is an output, and can be used to power the device you are connecting to (assuming it doesn’t want too much current at 5V) If the device you are talking to gets its power elsewhere (battery, wallwart, another USB connection), just leave the 5v pin on the converter unconnected. If it is a wire (as opposed to a header pin), put a bit of tape or heatshrink over it to keep it from accidentally shorting to anything

6

I appreciate the comments. I will continue trying without the connection to 5 v.

7

Hello, I have managed to see radio port fix data on the pc, both in tera term and in rtklib.

Now, I want to send that data to Rtk2go with rtklib on pc.

The data is sent but rtk2go does not decrypt it, I don’t know what type of data Rtk2go expects to receive.

The data from the radio port, converted from ttl to rs232, is received, but not decoded.

Can someone help me understand what is happening?

Greetings

8

Solved. The labels on the RS232 adapter led to confusion. Excellent help from Sparky.

The facet Tx must be connected to TX on my adapter. Against the usual.

Now rtk2go receives the data correctly.