XBee not sending data packets in API mode

XBee & XBee Gateway Other RF Products
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1

Hi,
I have 2 XBees S1 Pro, one is transmitter in API mode, the other one is reciever in transparent mode. I am sending data packets via MCU PIC30F5011. If I try to send the packet from transmitter via uart the packet is not sent. However if i connect the xbee into a computer and try to send the same packet with XCTU or LabView the packet is fine and the Xbee have no problem sending it, so the packet must be correct. I also tried connecting the uart into computer and check the output in Teraterm and the packet looks exactly the same as the one from XCTU.

2

It is probably either a Voltage issues or a timing issue on your processor. Keep in mind that the XBee is a 3V device and in order to connect it to a 5V PIC, you must use a level shifter between the two.

3

Thanks for contribution, but I don’t think this is the problem. I measured the whole board with oscilloscope and the voltage levels were alright.

4

If you connect your PIC to the PC via the port you are using for the XBee, are you able to see the same packet in your terminal screen or XCTU?

5

Yes, the packet is the same and is also fine with XCTU packet control.

6

Than the only thing left is the hardware interface between the XBee and the PIC. This means that the issue must be in the level shifters.

7

Thanks for your replies, but I just solved the problem. It was not the level shifters, but baud rate, I think the PIC is too slow and cant keep up with the 115200 baud rate. Working when you reduce the baud to 57600.