Which communication standard operates at 7 and 12 V?

The communication standard that operates at 7 and 12 volts is Class 2. This low-speed communication protocol is predominantly used in automotive applications, particularly for exchanging data between electronic modules. Class 2 operates on two voltage levels, which fall within the specified range of 7 to 12 volts, making it suitable for various vehicle systems like body control modules, which manage functions such as lighting and comfort features.

While other options such as UART, CAN, and LIN are important communication standards in automotive and electronics, they operate on different voltage levels or principles. For instance, UART typically works at 0 to 5 volts or higher, CAN operates at a different standard voltage level depending on the implementation, and LIN also operates typically at a single voltage level close to 12 volts, but with different specifications regarding its voltage swing. Therefore, Class 2 is specifically characterized by its operation within the 7 to 12-volt range, highlighting its suitability for communication in specific automotive contexts.