1、This module uses RS485 communication interface, expandable 32-channel switch input, 32-channel transistor output (non-isolated), 16-channel switch input, 16-channel transistor output (non-isolated) 2、Possess quick response, output response speed <1ms, input refresh rate is 200Hz, baud rate support 600~115200 3、RS485 baud rate is available from 600, 1200, 2400, 4800, 9600, 19200, 38400, 115200 4、Station number can be changed from 01~247, very practical and convenient to use 5、Excellent engineering plastic material possess high mechanical strength, good heat resistance and good electrical insulation Item Type: Relay Module Power Supply: 18~28V DC Input Terminal Trigger Mode: Ground Input Port Trigger Current: 2mA Output Terminal Output Mode: Pull down to com Maximum Continuous Sink Current of A Single Output Port: 2A Maximum Instantaneous Current of Output Single Port (≤1ms): 15A Communication Interface: RS485; RTU Material: Engineering Plastic How to Use: 1. In order to prevent the internal temperature of the machine from overheating, please use the wall-mounted installation. It is required to leave enough space above and below as a heat dissipation space. 3. Avoid dust, oil, and corrosive environments; pay attention to electrostatic protection (avoid direct contact with the circuit board circuit with your hands). Adopt rail installation. 1 x Relay Module 1 x User Manual