16 Channel Relay Module DC 12V MODBUS RTU RS485 Relay Module Board PLC Controller Serial Port Switch Standby Current 11MA

Product Information

Manufacturer: KMTronic LTDModel: MDB8CRFeatures: - Each relay has an LED to indicate when it is operated. Most purchases from business sellers are protected by the Consumer Contract Regulations 2013 which give you the right to cancel the purchase within 14 days after the day you receive the item. 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 3-4th byte of the transmitted frame is represent relay address,relay1-relay8’s address separately is 0x0003,0x0008,0x000D,0x0012,0x0017,0x001C,0x0021,0x0026.

The holding registers can also be read but I had no need to do this and have not included doing that in this example. If the item comes direct from a manufacturer, it may be delivered in non-retail packaging, such as a plain or unprinted box or plastic bag. Finally, the setup has been tested successfully with QModMaster installed in my Windows 10 (x64) laptop.Specifications: Relays have Normally Open (NO) and Normally Closed (NC) Contacts each capable of switching max. Seller has stated it will dispatch the item within 1 working day upon receipt of cleared payment - opens in a new window or tab . Send the 3--4th byte of the transmitted frame represents the relay address,the relay 1-relay 8 address are respectively 0x0000,0x0001,0x0002,0x0003,0x0004,0x0005,0x0006,0x0007. Its AC plug may be changed, so please specify the type of the plug you want to use and we will send it with this AC plug.

Modbus device through receive from external control terminal (like Host computer/MCU )Modbus RTU instruction to perform related operations, one frame instruction generally consists of device address, function code, register address, register data, and check code,frame length is related to function code.Modbus RTU is limited to a single master, that means, only one set of signals can be on the RS485 link at any one time.