Having trouble with TX and RX from my autopilot. I am using the RFD900 link which has 5 wires ground, positive, RX, TX, and CTS "Clear to send control input".
My autopilot only has ground, TX and RX. I think my problem has something to do with the CTS wire. Does anyone know how to bypass the CTS wire? Also in the 3DR program is there a way to turn off flow control?
Here is a link to what I am playing with.
http://rfdesign.com.au/index.php/rfd900
Here is some more wiring stuff
http://www.ftdichip.com/Support/Documents/DataSheets/Cables/DS_TTL-232R_CABLES.pdf
Replies
Hi Sean,
The RFD900s and 3DR radios are preset with flow control turned off.
The only connections that are needed for both are, GND, TX, RX, +5V
Things that are worth checking out are to see the green link LED is solid on both sides - if it is flashing, it means that the radios are not connected to each other. Also, to check that the red LED is flashing on both ends - this shows data traffic flow on both ends.
The serial port is on 3DR and RFD900s is also set by default to 57600, n, 8, 1..
TX and RX always have a way of ending up switched, no matter how carefully they are checked (ask any electronics engineer ! :) ) -- you can try swapping them if you are using your own cable harness.
Hope it helps a little !