Atom RS232 is a TTL-RS232 level converter based on the Atomic design. RS232 is a full-duplex communication protocol standard that defines the electrical characteristics of serial communication systems and is widely used in industrial control fields. The module uses the MAX232 chip, supports bidirectional conversion between TTL and RS232 levels, and has a built-in DC-DC step-down voltage regulator chip, allowing direct power supply to the ATOM through the 12V level of RS232.