My experience is with the RFD900 radios, not the 3dr, but I believe they use the same commands, so I will answer as if they are RFD900 units.
with SiK software version 1, NO
with SiK software version 2, YES (not paired, but one set as master and the other as slave)
In addition, the NETID (network ID) must be the same number on both units
There are 2 speeds which are set independently:
serial for communication between Reach and radio (usually 57600)
air data rate for communication between radios (I’m using 32kbps right now)
Yes, you should check the serial speeds are the same as Reach (57600) and if you plug the radios to your computer for testing, make sure your computer’s USB/serial port settings are set to the same speed.
I’m not sure if this is the same problem you are having, but I can’t boot Reach with the radio plugged in. So my workaround for that is to disconnect the radio power, then boot Reach, then reconnect the radio power. After that it works fine.
Another thing I did was read the RFD900 documentation and get familiar with the modem AT commands. Then I hooked both modems to my computer and made them communicate and pass keystrokes back and forth. Then I connected them to Reach and tested with keystrokes. What I mean is typing in one radio and watching the characters appear from the other one. When you prove to yourself that the radios are working then start up ReachView and everything should be OK.
That’s good that you can see the red LEDs blinking.
If your serial or USB speeds are set incorrectly, the red LEDs can still blink. The data that is being sent will be corrupt and the rover will not be able to use it. So please confirm that your 3dr radio serial speed matches your speed in ReachView.
I have used many 3dr v2 radios and I know they can work quite well.
After a few days of use they often fail. The radios are very cheap and are very sensitive to damage from not having an antenna connected.
The much more expensive RFD 900mz radio work much more consistently and have longer range. The RFD 900mz radios have the same type of firmware that the 3dr radios have so changing settings uses the same application.