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!

Sensor’s return value under Q&A mode:

Stable6

Concentration(High Byte): The highest bit(bit 8) is for sensor fault judgment;

sensor fault judgment: 1 is for sensor failure, 0 is for no failure

Gas concentration value = The low 6 bit of High Byte*256+Low Byte.

3. Check sum and calculation

Construction for working status:

Preheating status: indicator flashes slowly after powering on, it becomes be off for

long in 3 min.

Malfunction status: when the sensor malfunctions, green indicator will start the cycle

of 75ms on and 175ms off .

Alarm status: when the target gas’s concentration reaches the alarm point, green

indicator will start the cycle of 25ms lighting and 75ms off.

Installation instruction

This module connects with external part by adopting Pin1.25mm*8 single-row

inserting pin, there are four holes with 2mm diameters at the four corners, users fix

the module through locations holes and make connection through Pin1.25mm*8

Byte0

Byte1

Byte2

Byte3

Byte4

Byte5

Byte6

Byte7

Byte8

Start

Byte

command

Concentration

(High Byte)ppm

Concentration

(Low Byte)ppm

Reserved Reserved

Concentration

(High Byte)ppm

Concentration

(Low Byte)ppm

Check

sum

0xFF

0x86

0x00

0x00

0x00

0x00

0x00

0x00

0x7A