Home/Support/Support Forum/Can I use the XBEE module in a 4.2V RS-232 serial communication?

Can I use the XBEE module in a 4.2V RS-232 serial communication?

0 votes
I have two calculators (algebra fx 2.0 plus) which I made communicate by a serial connection RS-232, with the cable RX-TX-GND. I wanted to use a wireless connection, so I bought two XBEE modules :), set the same speed on the calculators and on the XBEE... However, I know that the serial communication of the XBEE is basically 0/3.3V, while my calculator operates with 0/4.2V ... I think the calculator can read the 3.3V as a high logical level (one), but can I take the risk of overpowering the XBEE RX (not the external power) with 4.2V?
asked May 7, 2014 in IEEE 802.15.4 by moussaprince New to the Community (0 points)

Please log in or register to answer this question.

1 Answer

0 votes
No you can't connect the 3V XBee to the 4V? Device. You would need to use a level shifter between the two.
answered May 7, 2014 by mvut Veteran of the Digi Community (12,829 points)
You mean  a voltage divider like that:

calculator TX 4,2 V--> voltage divider --> xbee 3,3 V?
By the way I am powering XBEE with 3.3V, and the RX pin with 4.2V...
Is the XBEE RX 4.2V tolerant?
...