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HKF-12 Vital Capacity Sensor

HKF-12 vital capacity sensor utilizes gas flow pressure integral method of measuring body forced expiratory flow rate and flow, to calculate other parameters Vital capacity and forced expiratory human lung function. The product has the characteristics of compact size, easy to use, high measuring accuracy, can be widely used in various types of lung function test system.
Features
USB interface for direct communication with the computer.
Real-time data upload, testing process real-time upload expiratory time, flow rate, total flow.
Test results are automatically calculated and upload.
Start and end expiratory beep to remind.
Specifications
Expiratory time, Unit: s.
Forced vital capacity(PVC),Unit:ml.
§   Peak expiratory flow(PEF),Unit:ml/s.
§   First second forced expiratory volume (FEV1),Unit:ml.
§   FEV1/FVC.
§   Forced expiratory flow 25% (FEF25), Unit:ml/s.
§   Forced expiratory flow 75% (FEF75), Unit:ml/s.
§   Forced expiratory flow 25% to 75% (FEF2575), Unit:ml/s.
How to use:
1.   Install the device driver CP210x. Please do not connect the sensor to the computer when you install the driver.
2.   Connect the sensor to the computer, check the device virtual port number.
3.   Run the demo program.
4.   Performed the FVC test.

 
Communication Protocol:
1.   Hardware interface: RS232 or USB(USB to UART Bridge).
2.   Baud: 57600 bps. Data format: 8bit data, 1bit stop, no verify.
3.   Frame: Head(1Byte) + Command(1Byte) + Data(NByte) + CKSUM.
4.   Communication Commands
a)   Start sampling
Master -> Sensor: 0xF0 0xC0 CKSUM
Sensor -> Master: 0xF0 0xC0 TIMEH TIMEL LSH LSL LJH LJL CKSUM
PS: The sensor will automatically upload data after the start of sampling.
TIMEH TIMEL      Expiration time
LSH LSL          Velocity
LJH LJL          The total flow
b)   Stop sampling:
Master -> Sensor: 0xF0 0xC1 CKSUM
Sensor -> Master: 0xF0 0xC1 TIMEH TIMEL FVCH FVCL PEFH PEFL PEF1H PEF1L CKSUM
TIMEH TIMEL      The expiration time consumed
FVCH FVCL        FVC
FEFH FEFL        FEF
PEV1H PEV1L      PEV1
c)   Read serial number:
Master -> Sensor: 0xF0 0xC2 CKSUM
Sensor -> Master: 0xF0 0xC2 SN0 SN1 SN2 SN3 CKSUM
d)   Read the production date:
Master -> Sensor: 0xF0 0xC3 CKSUM
Sensor -> Master: 0xF0 0xC3 T0 T1 T2 T3 CKSUM

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