5pcs Dual Modbus-Rtu 2-way Relay Module Switch Input and Output RS485/TTL Communication Controller

Description LC 2 channel Modbus relay module equipped with mature and stable 8 bit MCU and RS485 level communication chip adopt standard MODBUS RTU format RS485 communication protocol It can realize 2bit input signal detection and 2 bit relay output It can be used for digital detection or power control occasions Features 1 Support Modbus RTU protocol2 Support RS485 TTL UART interface3 Output indicator in multi mode4 The address can be set5 Support input reverse connection protection6 Relay switch output7 Support parameter memory function Parameters 1 Item name Dual Modbus Relay Module 2 Work voltage DC 7V 24V3 Baud rate 4800 9600 19600bps default 9600bps 4 Optocoupler input signal DC 3 3V 30V5 Set address 1 2556 Relay control mode ON OFF Delay ON Delay OFF mode7 Delay time 0 6553 5s 8 Load AC 250V 10A or DC 28V 10A9 Protocol Modbus RTU10 Interface RS485 TTL UART11 Control channel 2channel12 Operating Temperature 20℃ 85℃13 Operating Humidity 5 95 RH14 Module Size 85 x 49 x 19mm Modbus RTU 1 Suppose the device address is 0xFF so return 00 10 00 00 00 01 02 00 FF EB 80 and the 9th byte is device address 2 Turn ON CH 1 Relay Normal Mode Send FF 05 00 00 FF 00 99 E4Return FF 05 00 00 FF 00 99 E4Note 1 The 3rd and 4th byte are relay addresses So it can be 0x0000 0x0001 0x0002 0x0003 Note 2 The 5th and 6th byte are relay data 0xFF00 means turn ON relay and 0x0000 means turn OFF relay 3 Turn OFF CH 1 Relay Norm