and 
Can I link a base to a rover directly with cables ?
yahya.aouledamer asked 1 year ago
I want to establish a base and rover by linking directly the two simpleRTK2B boards via cables.
I want to know which pins should connect exactly ?
clive1 answered 1 year ago
From the Arduino Rail
Have a common ground connection between the two units.
For each, IOREF pin to 3V3 power, it’s own, defining the IO levels.
Connect RX2 pin (OUTPUT) from the BASE, to TX2 pin (INPUT) on the ROVER
This will allow the BASE’s RTCM3 data output on the ZED’s UART2 to get to the ROVER’s
yahya.aouledamerNo, I don’t have them plugged into an arduino board
I will use only the two boards, but where to find the 3.3v power pin? and why not 5v?
clive1Isn’t there a 3V3_OUT pin on the board? On each board you loop that back to IOREF to establish a level. You don’t need to connect the power, but you do need to connect the grounds.
You’re just powering the board side pin drivers, you could use 5V if you wanted, use your best judgement about what’s most suitable for your situation.
https://www.ardusimple.com/wp-content/uploads/2018/01/simpleRTK2B.png
As a diagram
https://github.com/cturvey/RandomNinjaChef/blob/main/simpleRTK2B_HardWired_Base_Rover.jpg
Thanks for the diagram
I think I should link the rx2 of the rover to tx2 of the base, don’t I ?
To what end? The Base has no interest in what the Rover is outputting, and is mostly likely going to interfere with normal operation.
Well, I thought that RTK is a bidirectional system, and the base needs to get some informations from the rover
No, like the satellites, the information goes ONE WAY, the BASE can broadcast the SAME data to dozens or hundreds of ROVERs.
They can also solve for their own position based on data/observations from two view points, there own location, and that of another location of known/established position.
Now while the ROVER(s) might want to communicate their position to some centralized server, this is something that can, and should, occur independently. The BASE’s Radio and Antenna configurations can be optimized to broadcast.
Now, if you’re using NTRIP, the caster may want to know your location as a means to determine eligibility, or direct you to a data stream closest too you. It doesn’t need to know it.
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