Onboard and stable 32bit MCU STM32F103C6T6 chip; supply voltage: DC7-28V, support 5.08mm terminal power supply, with input anti-reverse protection. Onboard W5500 full hardware TCP/IP stack Ethernet chip, support 10/100Mbps rate; reserved UART serial port and SWD program burning port, support for secondary development; Communication protocol: support standard Modbus RTU protocol; on-board MCU reset button; on-board power and relay switch indicator; The device as a TCP Server side, supports IP address DHCP function, port number 5000; on-board 1-way 5V,10A/250VAC10A/30VDC relay, can be continuously suction and closure of 100,000 times, with diode lagging current protection, response time is short; relay status, device address can be read using the software/commands; Can be viewed through the serial port module IP address, UART communication baud rate: 115200; Output signal: relay switch signal, support for manual, flash closed, flash mode, flash closed/flash off the base of the delay is 0.1S, the maximum can be set to flash closed/flash off the maximum time for the 0 x FFFF * 0.1S = 6553.5S; device address: range 1-255, the default of 255, support for power-down Save. Description: Interface Introduction 1. Main control MCU: STM32F103C6T6; 2. Network chip: W5500 full hardware TCP/IP protocol stack Ethernet chip; 3. Network interface: 10M/100Mbps HR911105A network transformer: 4. 5.08mm terminal power supply port: DC7-28V power input, in which GND is negative; 5. MCU reset button: short press to reset; 6. MCU SWD debugging interface: used for secondary development and programming; 7. MCU UART debugging interface: GND, RXD, TXD: TTL level UART communication interface, GND, RXD, TXD are connected to GND, TXD, RXD of the external control terminal respectively. It supports connecting to 3.3V/5V external TTL serial port and is used for serial port by default. Check the device IP address and port number, the baud rate is 115200; 8. 1-way relay switch signal output: NC: Normally closed end, short-circuited to COM before the relay pulls in, and floating after pulling in; COM: Common end; NO: Normally open, floating in the air before the relay pulls in, and connected to COM after pulling in Short. size: 73mm x 45mm Material: PCB colour: As shown Package Contents: 1 x Single-Channel Modbus Network Relay Module 1 x 8p Single Row of Pins Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.