eBay RTU RS232 TTL UART Modbus 4ChRelay Module User Guide
eBay RTU RS232 TTL UART Modbus 4ChRelay Module Description Onboard mature and stable 8bit MCU and MAX3232 level conversion chip; Communication protocol: support standard Modbus RTU protocol; Communication interface: support RS232/TTL UART interface; Communication baud rate 4800/9600/19200, default 9600bps, support…