Features 1、CONVERSION CHIP: The 4 way relay module has mature and stable 8bit MCU and MAX485 level conversion chip, easy to use 2、BASIC SPECIFICATIONS: 1 channel 5V onboard, 10A, 250A AC 10A, 30V DC relay, can be pulled in 100,000 times continuously, with diode leakage protection, short response time 3、INPUT AND OUTPUT: This is a 4 way relay module, which using RS485 TTL UART 4 way input and output, reliable and safe 4、PROTOCOL SUPPORT: This is 4 channels relay module, which supports standard RTU protocol for home power, and durable 5、POWER OFF SAVE: The communication baud rate is 4800 9600 19200, the default is 9600bps, and relay module supports power off save Specification Item Type: 4 Channel Relay Module Material: PCB Communication Protocol: Support standard RTU protocol Communication Interface: Support RS485 TTL USRT interface Communication Baud Rate: 4800, 9600, 19200, default 9600bps, support power down 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 break mode, The delay base of flash closing flash breaking is 0.15, and the maximum flash closing flash breaking time can be set as OxFFFF0.1S=65535x0.1S-6553.5S Device Address: Range 1-255, Default 255, support power down save With on board relay switch indicator Package List 1 x Relay Module