The QYDQ-CB isolated repeater is compatible with the POWER-BUS standard, can extend the communication distance of the two-bus network, increase the number of devices in the two-bus network, and provide complete protection measures, with built-in 2500V signal magnetic coupling isolation, 500VDC power isolation module, 600W TVS surge protection and +/-15KV ESD electrostatic protection. The converter has a zero-delay automatic transmit/receive conversion function internally, with unique I/O circuit automatic control of data flow direction, without requiring any handshaking signals (such as RTS, DTR, etc.). No jumper settings are required to achieve full-duplex and half-duplex mode conversion, plug and play. Ensures compatibility with all existing communication software and interface hardware, without any software modifications to previous POWER-BUS-based working methods. The HRLB-CB isolated interface converter can provide reliable connections for point-to-point and point-to-multipoint communications. For point-to-multipoint, each repeater can allow up to 64 interface devices to be connected, with data communication rates of 300-115.2KBPS, and has power indicator lights and data flow indicator lights to indicate fault conditions.