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It worked, I made UART0_C3 = 16 and the logic was inverted. void setup() { delay(1000); Serial.begin(9600); // USB is always 12 Mbit/sec Serial1.begin(1200); UART0_C3 = 16; } In the image it's possible to see in green an Arduino signal and in red the Teensy 3 inverted signal.

Thank you very much, I'll try to change it and then I'll post some feedback here.

Hi, i'm trying to read a sensor who uses the SDI-12 protocol, it's a serial data 7E1 with negative logic. I'm wondering if it's possible to set a register to invert the logic of the serial on the Teensy 3. I took a look at the MK20DX128 documentation but I didn't find that option. Thanks.