This project helps you control 8 relays using RS485 link with the help of a PC. This kit can effectively convert a standard PC to a powerful PLC ( programmable logic controller ). At the PC end , you will need to use our RS232 to RS485 Interface – C020 or any other suitable RS232 to RS485 Converter.
The project can offer a low-cost serial relay contact interface, easy to use with Visual Basic, Basic, C, Labview, Testpoint, or other high level languages that allow access to a serial port.
You can simply use the accompanying software provided with this project or issue control commands using any popular Terminal Port software available on the net.
The Serial port on the computer should be configured to 2400 baud – 8 bit words – 1 stop bit – no parity
8 Channel RS485 Relay Board – [Link]