Relay Module 1 Channel Switch Control Board RS485 TTL Input Output DC7‑24V for RTU Item Type: Relay Module Chip: The board has mature and stable 8bit MCU and 485 level conversion chip; Communication Protocol: Support standard RTU protocol; Communication Interface: support R5485 ans 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, the flash off and flash off delay base is 0.1S, the maximum limit can be set to flash off and flash off time 0xFFFFx0.1S=65535x 0.1S=6553.5s; Device Address: Range 1-255, default 255, support power off save; 1 Channel: On board 1 way 5V, 10A/250A AC 10A/30V DC relay, which can be connected continuously for 100,000 times, with diode leakage protection, short response time; Indicator: On board relay switch indicator;