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ZPH02 Datasheet(PDF) 8 Page - Zhengzhou Winsen Electronics Technology Co., Ltd. |
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ZPH02 Datasheet(HTML) 8 Page - Zhengzhou Winsen Electronics Technology Co., Ltd. |
8 / 10 page Zhengzhou Winsen Electronics Technology Co., Ltd www.winsen-sensor.com Tel: 86-371-67169097/67169670 Fax: 86-371-60932988 Email: sales@winsensor.com Leading gas sensing solutions supplier in China! 6 Bad:8.00%-12.00% Worst:>12.00% This suggestion is just a reference, please set according to users’ real demand. Communication protocol 1.General Settings Stable 3. Baud rate 9600 Interface level 5±0.2 V(TTL) Data byte 8 byte Stop byte 1 byte Check byte no 2.Communication command Module sends the concentration value every other one second. Only send, no receive. Command as follow: Stable 4. Remarks: 1. Conversion of duty ratio: Eg: sensor sends one frame data, the third byte is 0x12 and the forth byte is 0x13. It means the duty ration of sensor’s output is 18.19%. 2. Conversion of PM2.5 K*18.19%=PM2.5 concentration. K is a proportionality coefficient , as experience, K=1000. 3.Check and calculation /********************************************************************** * Funtion name: ucharFucCheckSum(uchar *i,ucharln) * Funtion description:Sum check(Negate the sum of send and receive protocol 1/2/3/4/5/6/7 and +1 ) **********************************************************************/ unsigned char FucCheckSum(unsigned char *i,unsigned char ln) { unsigned char j,tempq=0; i+=1; for(j=0;j<(ln-2);j++) { tempq+=*i; i++; } 0 1 2 3 4 5 6 7 8 Start byte Detection type name code Unit (Low pulse rate) Integer part of low pulse rate Decimals part of low pulse rate Reservation Reservation Reservation Check value 0xFF 0x18 0x00 0x00-0x63 0x00-0x63 0x00 0x00 0x00 0x00-0xFF |
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