LINOVISION IOT-S300AP Barometric Pressure Sensor User Manual
- June 12, 2024
- LINOVISION
Table of Contents
Barometric Pressure
Sensor
Product Manual
（V1.2）
Important statement
Thank you very much for purchasing Firstrate products, we will serve you
sincerely forever.
Firstrate pursues excellent quality and pays more attention to excellent
after-sales service. If necessary, please call:+86-731-86171990.
Operation errors will shorten the life of the product, reduce its performance,
and may cause accidents in severe cases. Please hand over this manual to the
end user, and be sure to read it carefully before using the product. And
please keep it in a safe place for reference when needed. This manual is for
reference only, the actual product shall prevail.
Product overview
The sensor can be widely used in environmental detection, installed in a standard installation shell, the device adopts (4~20) mA, (0~5) V, (0~10) V, RS485 (standard MODBUS-RTU communication protocol) signal output . The transmitter is widely used in occasions that need to measure indoors, greenhouses, etc.
Features
- (10-30) V wide DC voltage power supply;
- (4~20) mA, (0~5) V, (0~10) V, RS485;
- (Wide air pressure range, applicable to various altitudes.
Technical indicators
| Supply voltage | (10-30) VDC, (0-10) output limited to 24VDC |
|---|---|
| Precision | ±0.15kPa (30kPa-120kPa) |
| Measuring range | Air pressure: 30-120kPa |
| Maximum power consumption | Analog signal: 1.2W Digital signal: 0.4W |
| Output signal | (4-20) mA, (0-5) V, (0-10) V, RS485 |
| Long-term stability | Air pressure: -0.1kPa/year |
| Response time | Less than or equal to 1S |
| Operating temperature | -20-60°C |
Precautions
- After opening the product package, please check whether the appearance of the product is intact, check whether the relevant content of the product instruction manual is consistent with the product, and keep the product instruction manual for more than one year;
- Wiring strictly according to the wiring diagram of the product, and work under the permissible excitation voltage of the product, and do not use it with overvoltage;
- Do not knock the product, so as not to damage the appearance and internal structure of the ring;
- The product has no customer-repairable parts, please contact our company in case of failure;
- If the company’s products fail under normal conditions, the warranty period is one year (13 months from the date of delivery by our company to the date of return). as the basis. For maintenance beyond the time limit, the company will charge a basic fee, and all products of the company will be maintained for life;
- Please refer to our company website or call us for details.
(RS485) MODBUS communication protocol
Basic settings of communication protocol
Transmission mode: MODBUS-RTU mode.
Communication parameters: default baud rate 9600bps (optional 2400bps,
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, it is recommended to power on the sensor again.
Slave address: The factory default is 1, which can be configured according to
user requirements.
Holding register list
| Parameter | MODBUS holding register address (16 bits) |
|---|---|
| Atmospheric pressure | Address: 0000H The read value is the measured value of |
atmospheric pressure. For example, the read value is Ox03ED,
converted to decimal 1005, and the measured value of atmospheric pressure is
1005hPa or 100.5kPa.
Baud rate| Address: 0014H The setting value is 24, 48, 96, 192, 384, 576,
1152, corresponding to the baud rate respectively, 2400, 4800, 9600, 19200,
38400, 57600, 115200, for example, the default baud rate is 9600, the setting
value is 0x0060
Check Digit| Address: 0015H Ox0000 means no parity, Ox0001 means odd parity,
0x0002 means even parity
Slave address| Address: 0017H Default: Ox0001
Note: Access to other addresses is prohibited。
Supported MODBUS function codes: 0x03, 0x06 03H function code example: read
the atmospheric pressure 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 | OOH | The high 8 bits of the start register address |
| Starting Address Lo | OOH | The lower 8 bits of the start register address |
| No. of Registers Hi | OOH | The upper 8 bits of the number of registers |
| No. of Registers Lo | 01 H | The lower 8 bits of the number of registers |
| CRC Check Lo | 84H | CRC check code lower 8 bits |
| CRC Check Hi | OAH | CRC check code high 8 bits |
★ Slave response：
| Slave Address | 01 H | Slave address |
|---|---|---|
| Function | 03H | Function code |
| Byte Count | 02H | Length is 2 bytes |
| Data Hi | 03H | Atmospheric pressure: 100.5kPa |
| Data Lo | EDH | Atmospheric pressure: 100.5kPa |
| CRC Check Lo | 78H | CRC check code lower 8 bits |
| CRC Check Hi | F9H | CRC check code high 8 bits |
06H function code example: modify the baud rate (in this case, modify it to
57600bps)
★Host query command:
| Slave Address | 01H | Save address |
|---|---|---|
| Function | 06H | Function code |
| Starting Address Hi | OOH | The baud rate holding register address is 0014H |
| Starting Address Lo | 14H | The baud rate holding register address is 0014H |
| Data Hi | 02H | When the baud rate is 57600bps, the value of the register is |
576, which is 0x0240
Data Lo| 40H| When the baud rate is 57600bps, the value of the register is
576, which is 0x0240
CRC Check Lo| C9H| CRC check code lower 8 bits
CRC Check Hi| 5EH| CRC check code high 8 bits
★ Slave response：
| Slave Address | 01H | Slave address |
|---|---|---|
| Function | 06H | Function code |
| Starting Address Hi | OOH | The baud rate holding register address is 0014H |
| Starting Address Lo | 14H | The baud rate holding register address is 0014H |
| Data Hi | 02H | When the baud rate is 57600bps, the value of the register is |
576, which is 0x0240
Data Lo| 40H| When the baud rate is 57600bps, the value of the register is
576, which is 0x0240
CRC Check Lo| C9H| CRC check code lower 8 bits
CRC Check Hi| 5EH| CRC check code high 8 bits