Features: The MBDBUS RTU 4 Channel Relays Module offers seamlessly 485 communication for multiple device networking Utilizing the MBDBUS RTU protocol with a defaulted address of 1, easily adjustable through user commands. This Relays module features four input channels (IN1-IN4) to read switches states through 485 communication, ensuring reliable performances without direct control over Relays outputs. For technicians and engineers, this module is perfectly for those involved in industrial automation or home projects, providing efficient solution for complex systems. Widely applicable in factory automation, this Relays module enhances system integration and control, making it essential component for advanced digital setting. Specifications: Item：MBDBUS RTU 4 Channel Relays Module Size: about 76mmx67mmx17.5mm/2.99x2.64x0.69in Support 485 communication 4 input channels (IN1-IN4) Package Includes: 1PC MBDBUS RTU 4 Channel Relays Module note: Due to the problems of lighting effects there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurement