Is XBee's dout pin always active or is my design flawed?

Projects Networking, Protocols, and Devices
1

Hello,

I have a circuit with a MCU and a XBee. I have included LEDs to check when the XBee receives or transmits data from/to the MCU (see picture below).

The yellow LED (reception from MCU) functions as expected. However the green LED (transmission to MCU) is always active.

Is there an issue in my design or is it because the XBee always sends data? In the latter case, is it normal? Actually I do not need to transmit data from the XBee to the MCU currently but it's strange whatsoever.

Thank you in advance.

2

However the green LED (transmission to MCU) is always active.

An LED is far too slow to detect that the pin has dropped for the interval needed to transmit a bit. Even if the pin drops often, you won't see that show on an LED.

3

I do not need to see every bit, but only if there's an ongoing transmission. And the LED on the DIN pin does the job so I don't see why the one on the DOUT pin wouldn't too.