The temperature and humidity transmitter mostly uses the temperature and humidity integrated probe as the temperature measurement element, collects the temperature and humidity signal, and converts it into a current signal or voltage signal output with a linear relationship with temperature and humidity after being processed by voltage stabilization filtering, arithmetic amplification, nonlinear correction, constant current and reverse protection circuits, or uses RS485 digital output signal. The temperature and humidity transmitter adopts RS485 digital output signal, which can better and effectively transmit signals under long-distance conditions and in environments with high electronic noise. Temperature and humidity transmitter RS485 communication example: For example, the temperature measurement range of the temperature and humidity transmitter is -40-125°C; The humidity measurement range is 0-100%RH. The address of the communication device of the temperature and humidity sensor is set to 01, that is, [Address]=01; At this time, CRC0=C4 and CRC1=0B. At this time, the command line of the temperature and humidity transmitter is as follows: 01 03 00 00 00 02 C4 0B. The return of the corresponding hexadecimal data indicates that the upper and lower computers can communicate, such as the returned hexadecimal data behavior: 01 03 04 00 F8 01 77 3A 74. Then 00 F8 is the temperature, which is converted to 248 in decimal system; 01 77 is humidity, which is converted to 375 in decimal system; Temperature data output: 0-1650 corresponds to -40-125°C (there is no change in the correspondence between range changes), so the current temperature is T=165*248/1650-40= -15.2°C. Humidity data output: 0-1000 corresponds to 0-100%RH, so the current humidity is RH=375*100/1000=37.5%RHt. We mentioned “CRC” above, and here we will explain to you what CRC is. In the field of data storage and data communication, in order to ensure the accuracy of data, it is necessary to use error detection methods. Among the many methods of error detection, CRC is the most well-known. The full name of CRC is cyclic redundancy check, which is characterized by strong error detection ability, low overhead, and easy to implement with encoders and detection circuits. As a result, CRC is ubiquitous in the field of data storage and data communication. If you have any questions about product consultation, product customization, agency, technical inquiry, quotation, etc., please contact Xingyi, 400-600-4496!