In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Sparks-R-Fun wrote:

I am not sure what you mean about having trouble matching the baud rates.  If you match them they should both be the same.  Pick something SLOW. like maybe 2400 baud.  The radio links might have a minimum data rate setting so do not go below that.  Otherwise, since you are not sending much data but you want it to arrive without errors I recommend transmitting at a relatively slow rate.

You could transmit a full-fledged packet with header, payload and checksum values or just send a single identifier byte.  Whatever you send I would send it several times to help ensure that it is actually received.  To further reduce errors you may want to select identifiers that differ by than more than a single bit.

For testing the serial settings you can set the radios aside and just connect the serial signal from the SX to the BS2 along with a ground line provided that both are running at five-volt levels.

- Sparks

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