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Description:
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1. Onboard mature and stable 8bit MCU and MAX3232 level conversion chip;
2. Communication protocol: support standard Modbus RTU protocol;
3. Communication interface: support RS232/TTL UART interface;
4. Communication baud rate 4800/9600/19200, default 9600bps, support power-off saving;
5. Optocoupler input signal range: DC3.3-24V (this input cannot be used for relay control);
6. Output signal: relay switch signal, support manual, flash-on, flash-off mode, flash-on/fla