MYIR-SF6 NDIR sensor User’s Manual Ningxia MaiYa Sensor Technology Development Co., LTD

Ningxia Maiya Sensor Technology Development Co.,Ltd.

Ningxia Maiya Sensor Technology Development Co.,Ltd. 1. Overview MYIR-SF6 is a kind of SF6 sensor based on a single-light source double wave nondispersive infrared(NDIR) detecting technology.It has fast and convenient access to gas monitoring and control systems.The sensor has long life, small volume, good stability and simple maintenance. 2. Electrical parameters power supply working current working temperature atmospheric pressure signal output

Ningxia Maiya Sensor Technology Development Co.,Ltd. VCC —— Power supply：6V±5%VDC GND —— Ground SIN —— Signal-bus I/O pin RXD —— Sensor receive/master transmit TXD —— Sensor transm

Ningxia Maiya Sensor Technology Development Co.,Ltd. There are 2 connections methods depending on the interface types respectively. Method 1: 6V TTL, Single-bus connection mode: VCC,GND,SIN Communication lines can be connected to the SIN, bus with ESD protection and flow restriction function (input 10 mA, output 0.5 mA). Method 2: 6V TTL, duplex connection mode: VCC,GND,RXD,TXD Input and output are TTL interfaces with ESD protection and flow restriction capabilities (up to 10 mAh). User needs to match the RS232 or RS485 interface, it needs to connect the corresponding (TTL to RS232, TTL to RS485)...

Ningxia Maiya Sensor Technology Development Co.,Ltd. the host issues the communication command, otherwise the data cannot be returned normally. 5.1 The protocol uses ASCII code data communication mode, and the format and annotation of data transmitting and receiving are as follows: ♦This table is just an example of sending a format description, and the command has no practical significance. Start character: The holonomic command starts with ‘: ’ Bus_Address: Initialization address of the sensor( The decimal number on the label, see Appendix 1 label information)must be converted to hexadecimal...

Ningxia Maiya Sensor Technology Development Co.,Ltd. four characters of ‘C, R, L, F' here.These two characters match the 'Enter' key on the keyboard and the command must end with 'Enter'.For example,one command could be character string[ :A00300010002A6 then press the 'Enter' key once to change the line] . ♦The 'CR -LF' in the following all is represented by—] . If the command sent is incomplete, no reply is received. 5.2 Data sending and receiving Data types and functional explanations of the different register addresses are represented in the table below. <Register Address-Data Type List>

Ningxia Maiya Sensor Technology Development Co.,Ltd. ♦ When read the concentration by sending 000A.If the return data is FFFF, indicates that the sensor is just preheated (for about 1 minute). If the return data is FFFE, indicates the temporary fault of the sensor light path such as temporary interference failure caused by the light road system humidity, mirror exposure. Take a sensor numbered 01-1903-0006 as an example,address 006 (Dec) ^ 06 (Hex): Host issues a command (concentration): Sensor returns instruction (concentration data):

Ningxia Maiya Sensor Technology Development Co.,Ltd. Sensor returns the same instruction and has a modification completed:

Ningxia Maiya Sensor Technology Development Co.,Ltd. When address has been changed to 0008,the communication can only use the 08 address and the initial address information on the external label will be invalid. The ASCII code required in the command and the corresponding decimal value is as following table: Take the command which is used to read concentration in 5.3 for example. The checksum is A5 and computing process is as following: First get the corresponding decimal value of all ASCII characters except the start character ‘:’.Refer to the red frame in the table above and the serult is as...

Ningxia Maiya Sensor Technology Development Co.,Ltd. 1) Optical sensor will have measurement failure at high humidity (FFFE output). Please keep the sensor working on condition without condensation and exposure. 2) If sensor has no communication, please check whether the power connection is well connected and especially note that the power supply voltage cannot be less than 5.7V, Then check the electrical topology of the host communication line. 3) The optical sensor is precision component to minimize vibration. 4) Do not touch the electronic devices on the sensor to avoid static disturbance....

Ningxia Maiya Sensor Technology Development Co.,Ltd. The sensor addresses are on decimal 1-254 cycle and maximum 254. Appendix 2: ASCII table