LC 4 channel Modbus relay module equipped with mature and stable 8-bit MCU and RS485 level communication chip,adopt standard MODBUS RTU RS485 communication protocol. It can realize 4bit input signal detection and 4bit relay output. It can be used for digital detection or power control occasions.Features:1.Support Modbus RTU protocol;2.Support RS485/TTL UART interface3.Output indicator in multi mode;4.Address can be set5.Support input reverse connection protection6.Relay switch output;7.Support parameter memory functionParameters:1.Item name: 4CH Modbus Relay Module2.Work voltage:DC 7V~24V3. rate:4800/9600/19600bps(default 9600bps)4.Optocoupler input signal:DC 3.3V~30V5.Set address:1~2556.Relay contorl mode: ON/OFF,Delay_ON,Delay_OFF mode7.Delay time: 0~6553.5s8.Load: AC 250V 10A or DC 28V 10A9.Protocol:Modbus RTU10.Interface:RS485/TTL UART11.Control channel: 4channel12.Operating Temperature:-20 Celsius~85 Celsius13.Operating Humidity:5%~95%RHcolour: blueMaterial: PCBsize: 93x90x20mmPackage Contents: 1 * Modbus RTU 4 Relay ModuleOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.