The Hitachi Kokusai Electric BC-D01H1-4 is a highly reliable electronic communication module engineered for industrial data transmission and networking applications. Operating with a transmission frequency of 4.0 MHz and a reception frequency of 6.0 MHz, it ensures stable and efficient signal processing. The module is equipped with a standard DB9 connector, a current loop power input, and a frame ground (FG) terminal for secure electrical integration. For real-time operational diagnostics, it features intuitive LED indicators for SD (Send Data), RD (Receive Data), LEVEL, and CD (Carrier Detect). Furthermore, it complies with VCCI Class 1 Information Technology Equipment standards, ensuring dependable performance in professional and industrial environments.