About the X11 terminal of USM-RC-3

[hitochan]

Hello
I purchased the USM-RC-3.

I plan to add a USB-C port to my vehicle and perform maintenance with the USM-RC-3 installed.
I plan to connect it using a custom-built circuit board instead of the K-USB-2.

Could you please tell me the specifications of the USM-RC-3 X11 terminal (for the K-USB-2)?
1. Is the X11 terminal a UART signal?
2. What is the UART signal voltage?
3. What is the X11 pin assignment?

Thank you in advance.

[BEIER-Electronic Andy]

The pin assignment:
brown: RX
red: GND
orange: TX

The voltage levels are nominally 3.3 V. However, the RX voltage can be higher (up to 15 V).

Note: The signals are inverted (like RS-232)!

[hitochan]

This was extremely helpful.

Thank you very much.