描述
Overview
The Modbus industrial duct temperature sensor is a sensor that uses our company's latest temperature measurement technology and can be widely used in industries such as building automation, climate and HVAC signal acquisition, greenhouse, and pharmaceutical and chemical industries.
characteristics
- High precision: Temperature accuracy ± 0.2 ℃ (25 ℃), long-term stability ≤ 0.03 ℃/y.
- Standard ModBus protocol: supports secondary development, easy to connect with PLC, configuration software and other devices. Multiple power supply modes: Supports DC12-36V or AC24V (± 20%) power supply, suitable for various scenarios.
- Multiple power supply methods: Supports DC12-36V or AC24V (± 20%) power supply, suitable for various scenarios.
- Reliable and durable: using sliding flanges, adjustable installation height, protection level IP65, can be used in harsh environments.
Main Parameters
- Power Supply: DC12-36V or AC24V (± 20%)
- Maximum Power Consumption: 1.2W
- Accuracy: Temperature ± 0.2 ℃ (25 ℃)
- Temperature Range: -40 ℃~120 ℃ (Default: -40 ℃~+80 ℃)
- Probe working temperature: -40 ℃~120 ℃ (default: -40 ℃~+80 ℃)
- Probe working humidity: 0% RH-100% RH
- Response time: temperature ≤ 25s (1m/s wind speed)
- Maximum allowable airflow velocity: 16m/s
- Output signal: RS485 (ModBus protocol)
- Overall size: 41.4mm × 41.4mm × 115mm
Application areas
- Building automation
- Climate and HVAC signal acquisition
- Greenhouse
- Pharmaceutical and chemical
- Other occasions requiring temperature monitoring
communication protocol
- Adopting ModBus RTU communication protocol
- Support function codes 0x03 (read register data) and 0x06 (write register data)
- Can read parameters such as temperature, humidity, device address, baud rate, etc
- Can modify device address, baud rate and other parameters
Basic communication parameters
- Data bits: 8 bits
- Parity bit: 8 bits
- Stop position: None
- Error check: CRC (cyclic redundancy check)
- Baud rate: 1200bit/s to 115200bit/s, adjustable, default is 4800bit/s
data frame format
The data frame format of Modbus RTU protocol includes:- Starting structure: Time interval of ≥ 4 bytes
- Address code: 1 byte, identifying the address of the sensor, unique in the network
- Function code: 1 byte, indicating the type of operation requested by the host
- Data area: N bytes, storing specific data or parameters
- Error check: 16 bit CRC code
- End structure: Time interval of ≥ 4 bytes
register address
- Temperature value: Register address 0x1100 (PLC address 40002), supports function codes 0x03/0x04, represents real-time temperature value (enlarged by 10 times)
- Temperature calibration value: Register address 0x0050 (PLC address 40081), supports function codes 0x03/0x04/0x06, represents integer temperature calibration value (enlarged by 10 times)
- Device address: Register address 0 X07D0 (PLC address 42001), supports function code 0x03/0x04/0x06, represents device address, range 1-254
- Device baud rate: Register address 0x07D1 (PLC address 42002), supports function code 0x03/0x04/0x06, represents device baud rate setting
Communication Protocol Example
Reading Temperature and Humidity Values
- Inquiry Frame: The host sends a request to read the temperature value of device address 0x01.
- Address Code: 0x01
- Function Code: 0x03 (Read Register Data)
- Register Starting Address: 0x1100
- Register Length: 0x0002
- CRC Check: Calculated from Device Address, Function Code, Starting Address, and Length
- Response Frame: Device Return Temperature Value -10.1 ℃
- Address Code: 0x01
- Function code: 0x03
- Effective bytes: 0x04
- Temperature value: FF9B (complement form, representing -101, i.e. -10.1 ℃)
- CRC check: Calculated from response frame data
Modify device address
- Inquiry frame: Host requests to modify device address from 0x01 to 0x02.
- Address code: 0x01
- Function code: 0x06 (write single register)
- Register address: 0x07D0 (device address)
- Modified value: 0x0002 (new address)
- CRC check: calculated from device address, function code, register address, and modified value
- Response frame: Device confirms address modification.
- Address Code: 0x01
- Function Code: 0x06
- Register Address: 0x07D0
- Modified Value: 0x0002 (Confirm New Address)
- CRC Check: Calculated from Response Frame Data
