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

Product Information

Due to its fast communication, stability, reliability, and safety, it is an ideal choice for industrial control equipment and/or applications with high communication requirement. No surprise, we often come across sellers who do not understand anything about what they’re selling! I'm working on a project for a friend that has a house that was wired with low voltage touch switches throughout the house that turn on the lights and some switched outlets. 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.

The 0x0100 is the code to tell the board to turn the relay on, 0x0200 is used to turn the relay on and 0x0300 toggles the relay to the opposite of what it is currently. It can realize 2-way input signal detection and 2-way relay output, can be used for digital detection or power control occasions. Built-in single power supply isolation provides stable isolated voltage without the need for an additional power supply for isolated terminals. In the line above gSlaveID was set to one, i is a number between one and 16 and refers to the relay to be controlled. Doing some digging online, it seems that Doc Walker had made a great ModbusMaster Arduino Library ( https://github.Please take a moment to review our updated Terms and Conditions, describing what information we collect, how it is used, and how you can control the use of your data. 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.

Model: R4S8CRMBSpecifications:Relays have Normally Open (NO) and Normally Closed (NC) Contacts each capable of switching max: . Just connect the power and RS485 to the first module and ribbon cable connect the remaining modules to form a compact IO station without the wiring costs. The 5--6th byte of the transmitted frame represents the data, 0xFF00 represent turn on relay,0x0000 represent turn off relay.Welcome to my quick review of an inexpensive 2-channel 5V relay module controlled via RS485 bus utilizing Modbus RTU protocol.

As claimed by some online sellers, this easy-to-get Modbus RTU 2-Channel 5V Relay Module is an ideal choice for industrial control equipments and/or applications with high communication requirements. So what you want is to have an openHAB Switch type Item, and when that is commanded ON or OFF you want to send 256 or 512 to a modbus holding register? If you believe that your personal data has been misused, you have the right to lodge a complaint with a supervisory authority.

While looking for relays and controllers we decided on an Arduino Mega and an assortment of relay boards.