Relay Module DC 7‑24V RS485/TTL Input Output with Anti Reverse Connection Protection Two Relay Modules Item Type: Relay Module Product Material: Plastic Communication Protocol: Support for Standard Modbus RTU Protocol Communication Interface: Support for R5485/TTL USRT Interface Communication Baud Rate: 4800/9600/19200, Default 960bps, Support Power Off Save Optocoupler Input Signal Range: DC3.3-30V (This Input Cannot Be Used for Relay Control) Output Signal: Relay Switch Signal, Support Manual, Flash Off, Flash off Mode, Flash Off/flash off Delay Base is 0.1s, the Maximum Limit Can Be Set to Flash Off/Flash Off Time 0xFFFF x 0.1s=65535 x 0.1s =6553.5s Device Address: Range 1-255, Default 255, Support Power Off Save