It features embedded protection circuits such as power isolation, ADI magnetic isolation, and TVS diodes. Built-in single power supply isolation provides stable isolated voltage without the need for an additional power supply for isolated terminals. Model: R4S8CRMBSpecifications:Relays have Normally Open (NO) and Normally Closed (NC) Contacts each capable of switching max: . Due to its fast communication, stability, reliability, and safety, it is an ideal choice for industrial control equipments and/or applications with high communication requirement.

Features:• Fully assembled and tested• Support up to 32 slave devices• Converts Modbus RS485 RTU into Modbus TCP/IP over EthernetManufacturer:KMtronic LTDApplications:- Monitoring (logging) photovoltaic systems and wind power turbines- Monitoring (logging) of energy consumptionComplete including:- 1. Finally, the setup has been tested successfully with QModMaster installed in my Windows 10 (x64) laptop. I could see a total of four J3Y (S8050) NPN transistors and one KL2 (BAT54A) SMD Schottky Barrier Diode as well. Doing some digging online, it seems that Doc Walker had made a great ModbusMaster Arduino Library ( https://github.

I spent a lot of time trying to get this to work, trying to find documentation for the relay board and figuring out how the Arduino Modbus libraries work. The following is an example of using the host computer software via the RS485 interface to open relay 1 (manual mode),suppose device address for 255. TXD,RXD,GND: TTL level UART Communication Interface,TXD,RXD,GND respectively connected to the external control terminal RXD,TXD,GND,only support 5V level TTL module /MCU.

This is a dull subject but I couldn't find anyone else that had posted anything about controlling this type of relay board from an Arduino.The 5--6th byte of the transmitted frame represents the data, 0xFF00 represent turn on relay,0x0000 represent turn off relay.