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How to NMEA output from Simple RTK2B
kevinemslie asked 6 months ago
Hello,
I have seen a similar question asked on here before but basically i need NMEA messages out to position data to an agricultural GPS display.
The display has a DB9 port and uses RS232 protocol.
Is it correct that i need to fit an Xbee RS232 adapter? as below, if so do i simply plug in or does it need, software installed ?
I have seen a similar question asked on here before but basically i need NMEA messages out to position data to an agricultural GPS display.
The display has a DB9 port and uses RS232 protocol.
Is it correct that i need to fit an Xbee RS232 adapter? as below, if so do i simply plug in or does it need, software installed ?
Thanks
Kevin
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replied 6 months ago
That would allow for NMEA sentences from UART2
How would you get RTCM3 data?
replied 6 months ago
That was going to be my next question, as I was thinking of using the 4G NTRIP master also to receive NTRIP corrections.
So how can I receive NTRIP corrections and sent out RTK NMEA ?
replied 6 months ago
You’d have to push data you’ve already sourced down the input RS232 channel.
For a stacked model, you’d want to be using the Lite board, and start with RS232 at the bottom. ie RS232 + Lite + NTRIP 4G
https://www.ardusimple.com/product/rs232-to-xbee-everything-adapter-3m-cable/”
The Lite board has different UARTs connected to the bottom pins vs top socket
replied 6 months ago
Ok, that’s sounds like what I need.
Just double checking but i see there is RX and TX connectors on the Simple RTK2B board, is that not an NMEA out put ?
replied 6 months ago
Yes, but you’d need to wire them more explicitly, to some other type of CMOS to RS232 adapter.
RX1, TX1 (output), IOREF (TO 3V3), and GND
NMEA can be output from UART1
replied 6 months ago
Hi, I have ordered and received the RS232 to everything and the lite, i have them connected together, connected the power to a 12 volt supply and ground, antenna is connected and the GPS FIX LED is flashing but when i connect the RS232 (DB9) connector to my GPS terminal i do not get any NMEA messages.
Also i cant get this unit to connect to U-center to check firmware etc, i am connected to the mico USB on the RS232 to everything board.
replied 6 months ago
Hi,
I have managed to get the “RS232 to everything” and the “lite” connected to U-centre i have connected the RS232 (DB9) connector to another PC with Tera Term installed to view the messages.
I can now see that the messages “talker ID” is set to GN but i need it set to GP.
I see where to change the message in U-centre but it doesn’t save, when i disable GN and then enable GP, it just reverts back to GN.
How do i get the talker ID to stay on GP ?
replied 6 months ago
If using UBX-CFG-NMEA, you’d likely want use UBX-CFG-CFG to save into FLASH
Alternatively there might be a configuration key approach, where you specify the key goes into FLASH
20930031 CFG-NMEA-MAINTALKERID
20930032 CFG-NMEA-GSVTALKERID
30930033 CFG-NMEA-BDSTALKERID
replied 6 months ago
Too many acronyms in there for me Clive, could explain that better to me please.
replied 6 months ago
Using uCenter Classic(ie 22.07)
You can configure the device via “View -> Message View”, descending to the tree nodes of the appropriate commands and configuration items
Keys via “View -> Generation 9 Configuration View’
The manual describes the supported functionalities, and commands/configuration
https://content.u-blox.com/sites/default/files/documents/u-blox-F9-HPG-1.32_InterfaceDescription_UBX-22008968.pdf
replied 6 months ago
Hi, i have figured out what you said above with trial and error, i then needed to find and change the baud rate and the Hertz which i have done.
It is still not working properly, i think i need to change the amount of numbers after the decimal place on the Coordinates of the GGA sentence.
I need 7 digits after the decimal place on the GGA sentence.
How do i change the amount to digits after the decimal place on the GGA sentence ?
replied 6 months ago
Via UBX-CFG-NMEA High Precision option
or
CFG-NMEA-HIGHPREC 0x10930006
replied 6 months ago
Got it, thank you
replied 6 months ago
I have this working, my only issue is I cant get a heading/course to appear in the GPVTG message sentence unless the rover is moving.
Is there a setting we can change to get the heading/course to show in the VTG when the rover is stationary ?
replied 6 months ago
The GPS/GNSS antenna is not directional, signals are incident from all directions.
You have to move from A to B, tells you how the vehicle is moving, not the direction it is pointing, although this tends to follow for ground vehicles, it’s not true for boats or planes.
Orientation systems use TWO antennas, or more, and the direction is determined via relative position of each, and geometry, whilst static or moving.
replied 6 months ago
Hi, I’m at the final stages of this project, I have the RS232 to everything + Simple RTK2Blite + 4G NTRIP Master all connected, i can get an RTK fix when its all connected to U-centre but as soon as I close U-centre or disconnect the receiver from the PC I loose RTK.
So when i follow the hook up guide, it says to make a configuration file and use the configuration tool to install it but when I do this, the install always fails, i have also tried to install the software but it fails also.
I have also read that the 4G NTRIP Master is not compatible with the RTK2B lite, is this correct ?
replied 5 months ago
Can you answer my questions above please ?
Thanks
Kevin
replied 5 months ago
These are things you’ll likely need to work through with ArduSimple’s more direct support options.