Description: 4-channel Modbus LC relay module equipped with 8-bit and stable MCU and RS485 level communication chip, adopts RS485 communication protocol in standard MODBUS RTU format. It can realize 4-bit input signal detection and 4-bit relay output. It can be used for digital detection or power control occasions. Features: 1. Support Modbus RTU protocol; 2. Support RS485 / TTL UART interface 3. Multi-mode output indicator; 4. Address can be set 5. Support input reverse connection protection 6. Relay switch output; 7.Support parameter memory function Parameters: 1.Item Name: 4CH Modbus Relay Module 2.Working Voltage: DC 7V~24V 3. Baud rate: 4800/9600/19600bps (default 9600bps) 4.Optocoupler input signal: DC 3.3V~30V 5.Set address: 1~255 6.Relay contorl mode: ON/OFF, Delay_ON, Delay_OFF mode 7.Delay time: 0~6553.5s 8.Load: AC 250V 10A or DC 28V 10A 9.Protocol: Modbus RTU 10.Interface: RS485 / TTL UART 11.Control channel: 4 channels 12.Operating temperature: -20 Celsius ~ 85 Celsius