XBEE seems to be unresponsive

I have a XBEE 3 Micro (XB3-24Z8CM Rev C) soldered on a custom PCB. The Xbee is connected to an Teensy 3.2. I can't connect to it via serial connection. I am using '+++' to get into AT mode, but get no answer.

I made the following connections:

  • GND to Teensy GND
  • VCC to Teensy 3v3
  • DOUT to Teensy RX
  • DIN to Teensy TX

Using an oscilloscope, i get the following signals on the pins:

1.GND) 0V 2.Vcc) +3v3 3.DOUT) 0V 4.DIN) my serial signal ('+++') 5) +3v3 6.RESET) +3v3 7->19) 0V 20.RSVD) +3v3 22->34) 0V

I'm especially surprised that I'm getting 0V on the ON-pin.

What am I doing wrong?

Do the baud rates match?

mikb55: Do the baud rates match?

I have tried 9600 1/s as well as 152000 1/s

Are you assuming that it has the default factory settings?

These things aren't cheap so I always test them and check the settings using a USB/xbee adaptor and the XCTU utility before using them in a project.

mikb55: Are you assuming that it has the default factory settings?

These things aren't cheap so I always test them and check the settings using a USB/xbee adaptor and the XCTU utility before using them in a project.

Yes, I assume that they are on factory default. They were bought in around February 2019, so presumably run on an early firmware.

The adaptor board was, as far as I know not available back then so I plan(ned) to configure them onboard.