Nanatoc RS485 Temperature and Humidity Sensor
Product description
The temperature and humidity atmospheric pressure sensor can be widely used in environmental detection, integrating temperature and humidity, and the device can be customized with standard MODBUS-RTU communication protocol, RS485 signal, (0-5)V, (0-10)V, (4-20) O utput such as mA. This transmitter is widely used in applications where temperature and humidity are required to be measured.
Features
- 10-30V wide DC voltage supply
- Standard MODBUS-RTU communication protocol
- Wide range of air pressure range, can be applied to various altitudes
Technical indicators
| Supply
voltage |
10~30VDC | |
|
Precision |
temperature | ± 0 . 5 ℃ 25 ℃ |
| Relative
humidity |
±3%RH- 5%RH~95%RH-25℃ | |
|
Measuring range |
temperature | -40℃ ~80℃ |
| Relative
humidity |
0%RH~100%RH | |
|
display resolution |
temperature | 0.1℃ |
| Relative
humidity |
0.1%RH | |
|
Long-term stability |
temperature | 0.1℃ /y |
| Relative
humidity |
0.1%RH/y | |
| output signal | (0-5)V, (0-10)V, (4-20)mA, RS485, Modbus RTU Protocol, | |
| Operating
temperature |
-20~60℃ | |
| Storage
temperature |
-40~100℃ | |
Electrical interface and connection method
Notes
- After opening the product packaging, please check whether the appearance of the product is intact, verify that the relevant content of the product manual is consistent with the product, and keep the product manual for more than one year;
- Strictly follow the wiring diagram of the product, and work under the excitation voltage of the product, do not use over voltage;
- Do not knock the product to avoid damage to the appearance and internal structure of the ring;
- The product has no customer self-repair parts, please contact our company in case of failure;
- If the company’s products have a failure under normal circumstances, the warranty period is one year (from the date of shipment from the company to the 13 months after the date of return), whether it is a failure under normal circumstances, the inspection by our quality inspectors is in accordance with. After the deadline for maintenance, the company charges a basic fee, all products of the company for lifetime maintenance;
- If any question, please visit our website or call us.
Common problems and solutions
Possible reasons when the device cannot be connected to a PLC or computer:
- The computer has multiple COM ports and the selected port is incorrect.
- The device address is incorrect, or there is a device with duplicate addresses (all factory defaults are 1).
- Baud rate, check mode, data bit, stop bit error.
- The host polling interval and the waiting response time are too short and need to be set to more than 200ms.
- The 485 bus is disconnected, or the A and B lines are reversed.
- If the number of devices is too large or the wiring is too long, the power should be supplied nearby, add 485 booster, and increase the 120Ω terminating resistor.
- The USB to 485 driver is not installed or damaged.
- The equipment is damaged.
Important statement
Thank you very much for purchasing the Firstrate sensor (transmitter), we will serve you forever. Firstrate pursues outstanding quality and pays more attention to good after-sales service. Operational errors can shorten the life of the product, reduce its performance, and can cause accidents in severe cases. Please read this manual carefully before using it. Submit this manual to the end user. Please keep the manual in a safe place for your reference. The manual is for reference. The specific design shape is subject to the actual product.
Temperature and Humidity Sensor (RS485) MODBUS Communication Protocol
- The basic settings of the communication protocol
Transmission mode: MODBUS-RTU mode. Communication parameters: default baud rate 9600bps (optional 4800bps, 9600bps, 19200bps, 38400bps, 57600bps, 115200bps, can be configured according to user requirements), 1 start bit, 8 data bits, no parity (optional odd parity) , even parity), 1 stop bit, after changing the communication parameters, the sensor needs to be powered on again. Slave address: The factory default is 1, which can be configured according to user requirements. - Keep the register list
Parameter MODBUS Hold Register Address (16-bit) Temperature
Address: 0000H The temperature data is uploaded in the form of a complement. The value of the reading is divided by 10 to obtain the measured value of the temperature. For example, the reading value is 0xFF9B, and the decimal value is -101, the measured value of the temperature is -10.1 °C.
Relative Humidity
Address: 0001H The measured value of the relative humidity can be obtained by dividing the value by 10. For example, if the reading value is 0x0149 and the decimal value is 329, the measured value of relative humidity is 32.9% RH.
Baud rate
Address: 0014H The setting values are 48, 96, 192, 384, 576, and 1152, corresponding to baud rates of 4800, 9600, 19200, 38400, 57600, and 115200, for example, the default baud rate is 9600, and the setting value is 0x0060.
Check digit Address: 0015H 0x0000 means no parity, 0x0001 stands for odd parity, 0x0002 stands for even parity
Slave address Address: 0017H Default: 0x0001 Note: Access is prohibited for other addresses.
- Modbus RTU instruction
Supported MODBUS function codes: 0x03, 0x06. Example of 03H function code: Read the temperature measurement data of the sensor whose slave address is No. 1. - Host query command:
Slave Address 01H Slave Address Function 03H function code Starting Address Hi 00H Start register address is 8 bits high Starting Address Lo 00H Start register address lower 8 bits No. of Registers Hi 00H The upper 8 bits of the number of registers
No. of Registers Lo 01H The lower 8 bits of the number of registers
CRC Check Lo 84H CRC check code low 8 digits CRC Check Hi 0AH CRC check code high 8 bits - Slave response:
Slave Address 01H Slave Address Function 03H function code Byte Count 02H is 2 bytes in length Data Hi 00H The temperature at this time is: 24.7 ° C
Data Lo F7H at this time temperature: 24.7 ° C CRC Check Lo F9H CRC check code low 8 digits CRC Check Hi C2H CRC check code is 8 bits high Example of 06H function code: modify the baud rate (this example is modified to 57600bps)
- Host query command:
Slave Address 01H Slave Address Function 06H function code Starting Address Hi 00H The baud rate holding register address is 0014H
Starting Address Lo 14H baud rate holding register address is 0014H
Data Hi 02H baud rate is 57600 bps, the value of the register is 576, which is 0x0240.
Data Lo 40H baud rate is 57600 bps, the value of the register is 576, which is 0x0240.
CRC Check Lo C9H CRC check code low 8 digits CRC Check Hi 5EH CRC check code high 8 bits - Slave response:
Slave Address 01H Slave Address Function 06H function code Starting Address Hi 00H The baud rate holding register address is 0014H
Starting Address Lo 14H baud rate holding register address is 0014H
Data Hi 02H baud rate is 57600 bps, the value of the register is 576, which is 0x0240.
Data Lo 40H baud rate is 57600 bps, the value of the register is 576, which is 0x0240.
CRC Check Lo C9H CRC check code low 8 digits CRC Check Hi 5EH CRC check code high 8 bits
Documents / Resources
 |
Nanatoc RS485 Temperature and Humidity Sensor [pdf] User Guide RS485 Temperature and Humidity Sensor, RS485, Temperature and Humidity Sensor, Humidity Sensor, Sensor |
