Fully comply with standard EN1434-3 and Chinese national standard CJ/T188-2018; Ultra low static power consumption Short circuit protection low power consumption; USB plug, safe and stable; USB-B interface is robust and plug Support systems including win11; Support MacOS system, Linux system and Android system; USB power supply, without any external power supply; Small shell size, convenient for on-site commissioning and carrying Carry 15 standard slave devices on average according to the load size, and the maximum load quantity can reach 20 The module has no spontaneous self reception and bit error within the normal load range; The communication baud rate 300-9600 can adapt to 19200bps at most,Ultra long communication distance, distance 1KM, communication bit error rate lower than 1/10000 Connect the slave stations (user water meter, user heat meter, user gas meter, etc.) in parallel in turn to the interface; Connect the USB module to the USB port of the computer, and the USB status indicator lights up Load capacity: The maximum load current Ic of bus is 80mA, the static current of slave station is represented by IS, the dynamic current of slave station is represented by It, and the load quantity is represented by N. The load carrying quantity is calculated according to the maximum static current IS 5mA and the maximum dynamic current It20mA of the slave station Loaded quantity N=(Ic It)/IS=(80-20)/5=12 The maximum load current Ic of bus is 80mA, the static current of slave station is represented by IS, the dynamic current of slave station is represented by It, and the load quantity is represented by N. The load carrying quantity is calculated according to the standard static current IS 3mA and the maximum dynamic current lt20mA of the slave station Loadedquantity N=(Ic )/IS=(80-20)/3=20 Calculated according to the standard static current 3mA of the slave station, the maximum number of modules with load is 20; If the slave stat