Inverting Serial comms for RS232 input

[Aargh]

Hi Everyone
I recently bought a Maxbotix ultrasonic range finder, which outputs data in "RS232" which is not really RS232 as it is 0 - Vcc. I found another post with details on how to invert the signal coming from the teensy, and used this approach to set the UART Status Register 2 (UART_S2), one bit of which inverts the incoming signal, which works a treat.

UART1_S2=0b00010000;

My question relates to the other bits I'm setting as I have no idea what these are doing (from page 1216 of the technical manual):
LIN Break Detect Interrupt Flag
RxD Pin Active Edge Interrupt Flag
Most Significant Bit First
Receive Wakeup Idle Detect
Break Transmit Character Length
LIN Break Detection Enable
Receiver Active Flag

I don't really care what these things do, just so long as I know the way I have set them isn't going to cause stability or performance issues.
The other thing which I think this line of code may open up is the ability for the teensy to read real RS232 data with a couple of resistors and a diode:

Although I'm not sure if that diode will work to stop the negative voltage getting to the teensy?
Disclaimer - I'm pretty new to all this if you haven't figured it out.....

 

[PaulStoffregen]

On Teensy3, you can use Serial1.begin(baud, format), where "format" can be SERIAL_8N1_RXINV_TXINV to select inverted signals.

You can also directly manipulate the hardware registers, if you really want to...

 

[Aargh]

Haha yep that would be more straight forward! Cheers for that Paul.
Not important now but I forgot to mention that I'm using a Teensy 3.1 board.