zed f9p can not connect to u-center

GPS/GNSS Development Boards
1

Hi, I am using two zed f9p modules from SparkFun for moving rtk. However, I am having serious issues already three times.

My moving rtk module was working fine and I was logging gps data with u-center.

And while I was logging gps data, suddenly, u-center stopped and then… u-center never let me connect zed f9p to it.

It keeps saying "“cannot connect to COM##”. I tried all baudrate but still gave me same message error.

Nothing was changed when it happened. And I already experienced this before so I thought that I did something wrong so I bought a new one. However this time, it seems like it has never been my problem.

There is no possibility of short. I checked it. Also, when I power up zed f9p modules again, leds were working fine. Power is lighted, pence is lighted, pps is blinking.

I was using usb c type cables which were working fine with other products. I tested by using other c-type cables but still u-center doesn’t let me connect both two gps to it. But the computer knows that gps is connected. I tried other usb ports, still u-center doesn’t let me connect gps.

I tried to connect port that gps is using with Realterm but it didn’t work out.

I tried it again the next day but still didn’t work. U-center still didn’t let me connect gps.

I deleted u-center and reinstalled it, but still didn’t work.

I even tried with two more different computers to connect it, but didn’t work.

Any ideas? I am really really really frustrated.

2

It’s possible to accidentally change a setting in the F9P and disable the USB port and it sounds to me like this may have happened.

The easiest way to recover from that would be to run the [FactoryDefaultviaI2C[/i] sketch from our Arduino library with the module connected to an Arduino via Qwiic. That will set the GPS back to factory defaults and should re-enable serial for you.](SparkFun_Ublox_Arduino_Library/examples/Example11_ResetModule at master · sparkfun/SparkFun_Ublox_Arduino_Library · GitHub)

3

Hi, Chris. Thank you for the reply.

There is one thing I couldn’t understand that you mentioned accidentally change a setting. Does zed f90 do it by itself? As I mentioned, i was just logging data and didn’t touch anything else. In addition, the first time when it happened to me, it worked fine the day before and when I turned it on next day, it didn’t work.

I already tried FactoryDefaultviaSerial from the library since i don’t have Qwiic cable but it didn’t work.

Is there anything else that can fix this problem?

Thank you for your reply.

4

When first messing with Arduino I lost communication with ZED-f9p plus my RTK LED went blank.

Using the Arduino Reset code mentioned

I got it to work using SCL SDA 3.3v GND on Arduino UNO. Thank you Chris.

I want to interface the ZED-f9p with a Jetson Nano…all my USB ports are used up… should I stick with I2C or jump to

Serial…which would be more stable?

Thank you

Andy

5

Either should work and both should be stable.

If USB is easier and you’re out of ports, a small USB hub should work with no issues on a Jetson. That would give you more USB ports.

6

Hi, Chris. Thank you for the reply. But I think my question was not answered so I am asking the same question one more time.

Thank you for your help. I tried to do factory reset with serial communication but it didn’t work. But when I tried it with i2c, it worked.

However, there is one thing I couldn’t understand that you mentioned “accidentally change a setting.”

Does zed f90 do it by itself? As I mentioned, i was just logging data and didn’t touch anything else.

In addition, the first time when it happened to me, it worked fine the day before and when I turned it on next day, it didn’t work at all.

I found it because I was logging with arduino and it gave me weird data so then I tried to check it with u-center. And u-center couldn’t connect gps.

I am pretty sure that there was no possibility that I accidentally changed settings when it happened first time.

I want to prevent this ever happen again to me even if I can just fix this problem by simply resetting it.

I appreciate your help.

7

What version of Windows and the driver are you using?

Have you connected via UART or USB and which board are you using?

8

However, there is one thing I couldn’t understand that you mentioned “accidentally change a setting.”

Does zed f90 do it by itself?

The GPS can not change it’s configuration on it’s own but there are a lot of buttons and options in ucenter you can accidentally press my mistake and that can change a setting in the GPS. I can’t say exactly what happened in your case, but it’s possible you accidentally clicked something and changed a setting.

If it happens again, the reset sketch should fix it for you.