Modbus RTU 4 Channel Relay Module 4CH Input Optocoupler Isolation RS485 MCU For Arduino

Feature: Relay communication: multi-unit network 485 communication, based on MBDBUS-RTU protocol, the default communication address is 1, the user can modify the address by command IN1 - IN4 are used by the switch. The status of the switch is read by 485, not by the input control relay output. 1. S1 reset button 2. D5 running LED indicator Description: 4 channel relay output (one normally open and one normally closed) STM8S103F3 MCU 4 channel optocoupler isolation 4 Relays Close LED Indicators Round DC interface and terminal DC interface. Convenient power wiring (supply voltage 12V) 4 channel input interface RS485 communication interface. A power indicator A User LED Lamp Reset button A SWIM download interface - (STLINK-V2 download program, users can develop programs twice) Pin description: 1. LED connected to user LED 2. TX RX is connected to 485 port and pin TTL port 3. KEY user button (red button on the left) 4. EN 485 use end 5. IN1 -IN4 input port is directly connected to the terminal 6. K1 - K4 relay output control 7. SWIM burning program J13 Package Included: 1 x Modbus RTU 4 channel Relay Module