Patrick,

The mDot has two serial ports:
1) Serial over USB (which you are using). By default this is for output logging only.
2) Serial through the UDK’s DB9 connector. By default this is used for AT Commands,

So you’ll need to use the DB9 connector to issue AT commands.

Make sense?

-Brandon

Patrick,

Ah, ok I understand your cable setup now. That should work.

Yes, that sounds correct for firmware flashing.

Which firmware are you loading on the mDot? You should be using the AT Command Firmware available from the Downloads page.

-Brandon

Patrick,

The lights as you see them are correct. From everything you’ve described, your setup should be working.

Please create a support case for this.

The EVB is basically an mDot with sensors attached, so it should be very similar.

-Brandon

• This reply was modified 9 years ago by Brandon Bayer.

You could also try to create a simple mbed program that just echos the serial input and try each interface in the program to trouble shoot without the AT firmware.

Serial Port pins: XBEE_DOUT, XBEE_DIN
USB Port pins: USBTX, USBRX

#include "mbed.h"

Serial pc(USBTX, USBRX); // tx, rx
// Serial pc(XBEE_DOUT, XBEE_DIN); // tx, rx

int main()
{
    pc.baud(115200);
    
    pc.printf("hello\r\n");
    
    while(1) {
        if(pc.readable()) {
            pc.putc(pc.getc());
        }
    }
}