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I/O line passing and powering up.

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Hello again,
I have line passing enabled on DIO4 - INPUT. I have several XB3's transmitting to one XB3 with DIO4 set to OUTPUT. I have an N.O. momentary switch on these INPUT's.

However, when I power up a transmitting XB, it sends a state change signal to the RX causing a false reading because the switch was never actuated. On the RX side, the signal that is sent upon powerup is passed on and causes a momentary relay to switch positions. I need to be able to add and subtract XB's to the network without disruption.

Is there a way for the XB to NOT send any kind of initial status upon startup?

Thanks very much!
asked Sep 21, 2020 in RF Solutions and XBee by Zaemo New to the Community (1 point)

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1 Answer

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Try setting the radio for change detect.
answered Sep 21, 2020 by mvut Veteran of the Digi Community (15,413 points)
That is how I am using using it.
You may want to try adding a small pull up or pull down resistor to make sure that the lines remains that way when you do not want it to.
Thank You.  Adding a 40K Ohm pulldown resistor as per the manual has solved my problem.  It's a bit confusing thinking a pulldown resistor is still needed after setting PR and PD.
I appreciate your time once again.