Taidacent Small Portable Analog Data Acquisition Module 18 Bits Analog to Digital Signal Converter Analog Input to Modbus RTU RS485 Communication

The DC0-20mA (DC4-20mA) data acquisition module uses imported 18-bit high-precision analog-to-digital converters to convert the DC0-20mA (4-20mA) signals into digital signals, which are output via the RS485 communication interface and standard modbus-rtu protocol. Communication address: 1~247; baud rate: 2400, 4800, 9600, 19200, 38000, 57600, 115200; check digit: no check, odd check, even check. The range corresponding to the DC0-20mA (4-20mA) signal input can be set, and the factory setting DC0-20mA (4-20mA) corresponds to 0-20000. Provide parameter setting host computer software to conveniently set the input signal range, communication address, baud rate and parity bit. Signal parameter description Input signal type selection: DC0-20mA, DC4-20mA. The decimal point of the range is dot, the lower limit of the range Lo, and the upper limit of the range Ho can be set. Assuming that the input current is In, the input signal type is selected as DC0-20mA, the relationship between reading and input, the range is: (Ho-Lo)*In/20+Lo; the input signal type is selected as DC4-20mA, reading and input, The relationship of the range is: when the input current is less than or equal to 4mA, the reading is Lo, and when the input current is greater than (Ho-Lo)*(In-4)/16+Lo. RS485 communication Communication protocol (1) RS485 communication interface, asynchronous half-duplex mode. (2) Communication baud rate: 2400, 4800, 9600, 19200, 38400, 57600, 115200bps can be set, and the factory default is 9600bps. (3) Data format: 8 data bits, 1 stop bit, optional odd parity, even parity, no parity. Standard Modbus-RTU protocol, communication address: 1~247; this machine currently supports 03H and 04H read commands, 10H write commands, and 03H and 04H read commands have the same function. The communication parameters are set by the host computer software.