Hello! I purchased your device named "R421B16 16 Channel DC 12V RS485 Relay Module Modbus RTU 485 Remote Control Switch Board for PLC PTZ Camera Motor" on AliExpress. I'm completely confused about the specific data transfer format for activating the relay. Do you have any documentation on the frame format? After connecting to the device and setting up the addressing, I'm sending write and read commands (close 1, 2, ...) via HyperTerminal, but the relay doesn't activate. The LED on the board flashes when receiving the command, and the data can be read, but the registers always show 0, and the relay doesn't activate. I also checked the data integrity and connection quality with the board with an oscilloscope. Everything is fine. Could you help me and send me the specific command formats for working with the relay? Thank you!answer : pls check our manual https://485io.com/eletechsup/R421B16-1.rar https://eletechsup.com/blogs/news/eletechsup-rs485-i-o-io-list
