Modbus RTU 4 Channel Relay Module 4CH Input Optocoupler Isolation RS485 MCU Geekcreit for Arduino - products that work w

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 commandIN1 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 button2 D5 running LED indicatorDescription 4 channel relay output one normally open and one normally closed STM8S103F3 MCU4 channel optocoupler isolation4 Relays Close LED IndicatorsRound DC interface and terminal DC interface Convenient power wiring supply voltage 12V 4 channel input interfaceRS485 communication interface A power indicatorA User LED LampReset buttonA SWIM download interface STLINK V2 download program users can develop programs twice Pin description 1 LED connected to user LED2 TX RX is connected to 485 port and pin TTL port3 KEY user button red button on the left 4 EN 485 use end5 IN1 IN4 input port is directly connected to the terminal6 K1 K4 relay output control7 SWIM burning program J13Package Included 1 xModbus RTU 4 channel Relay Module