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

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)

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1 Answer

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?

commented May 7, 2014 by moussaprince New to the Community (0 points)

By the way I am powering XBEE with 3.3V, and the RX pin with 4.2V...