EBYTE SM-CO-P01 Carbon Monoxide Module User Manual

EBYTE SM-CO-P01 Carbon Monoxide Module

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Note:
The contents of this manual are subject to change due to product version upgrades or other reasons. Chengdu Ebyte Electronic Technology Co.,Ltd. reserves the right to make changes to the contents of this manual without notice or suggestion. This manual serves only as a user guide and Chengdu Ebyte Electronic Technology Co.,Ltd. endeavors to provide accurate information in this manual, but Chengdu Billionaire Electronics Co., Ltd. does not ensure that the contents are completely error-free and that all statements, information and suggestions in this manual do not constitute any express or implied warranty.

Product Overview

Brief Introduction
This module is widely used in the whole machine development of household gas leakage alarm and gas leakage detection components. The input power supply, induction probe and signal output in the sensor are completely isolated. Safe and reliable, small size, easy to install.

Feature
This product adopts high-sensitivity electrochemical probe with stable signal and high precision. It has the characteristics of wide measurement range, fast response speed, convenient use and easy installation. In particular, it has the basic functions of a household gas leakage alarm, and only needs external status indication, buzzer, relay, and solenoid valve to achieve the function of a household gas leakage alarm that meets the national standard.

Main parameters

protocol)

Response time| ≤30 s
Recovery

T ime

| ≤30 s
O p erating

V o ltage

| DC 4.8V～5.3V
W o rking

current

| ≤5mA
M easurement

range

| 0～10000PPM
Resolution| 1PPM
Alarm value| Can be set (default 150PPM)
p r ecision| ±50PPM

(when the concentration is 150PPM)

life expectancy| 10 Year
follow the

s tandard

| National standard GB 15322.2
Use

environment

| Temperature: -10 ~ 55 ℃

Humidity: 20% ~ 90% RH

storage

environment

| Temperature: -20 ~ 60 ℃

Humidity: 20% ~ 65% RH

---|---
Dimensions| 40mm×25mm×24mm

Pin function description

pin number| definitio

n

| Function Description
---|---|---
1| VCC| 5V module power input
2| GND| reference place
3| CTL1| Control output 1:

1.  Continuously low level when there is no alarm or fault.

2.  In the alarm state, the continuous high level.

4| RXD| Serial port RXD data receiving pin
5| TXD| Serial port TXD data transmission pin
6| CTL2| Control output 2:

1.  Continuously low level when there is no alarm or fault.

2.  In the alarm state, the continuous high level.

7| CTL3| Control output 3, buzzer control: high level beep
8| CTL4| Control output 4, fault light control: high level on, low level off
9| VDD| Module 3.3V output, output current <100mA
10| IO1| Alarm light control port: high level on, low level off
11| IO2| Power light control port: high level on, low level off
12| IO3| Self-test key input port: low level key is valid
13| IO4| NC (keep floating)
14| IO5| NC (keep floating)
15| IO6| NC (keep floating)

Introduction to work status

1.  Power-on self-test
   When the power is turned on, the three lights are turned on in turn. After a delay of about 5 minutes, the buzzer will beep once and enter the normal working state, and the “power” light will flash.

2. Normal working condition
   When the module is in no fault or alarm state, the “Power” light flashes. In this state, press the “self-test” button, the module will perform acousto- optic self-test.

3. Alarm status
   When there is no fault in the module and the gas concentration on site is higher than the alarm setting value, the “alarm” light is always on, the buzzer makes a rapid sound, and a control signal is output. At this point, you can press the “self-test” button to mute the sound.
   When the gas concentration drops to within the alarm setting value, the module automatically returns to normal working state.

4. Fault status
   When the sensor fails, the “fault” light is always on, and the buzzer makes intermittent sounds.

Working status

| Fault light

(recommended yellow)

| warning light

(recommende d red)

| power light

(recommende d green)

|

buzzer

---|---|---|---|---
normal status| extinguished| extinguished| flicker| silent
fault state| Always bright| extinguished| extinguished| Tweet intermittently
---|---|---|---|---
Alarm status| extinguished| Always bright| extinguished| Tweet intermittently

Self-check status

|

running water lamp

| Keep tweeting 5

times

“Self-check” key: Press the “Self-check” key in normal state to carry out self-check; in alarm state, press the “Self-check” key to silence the alarm.

System Frame Diagram
Principles of application of detection components

Product selection

Configuration software installation and use

Our company provides supporting “sensor monitoring software”, which can easily use the computer to read the parameters of the sensor, and flexibly modify the device ID and address of the sensor.
Note that there is only one sensor on the bus when using automatic acquisition by software.

Sensor connected to computer
After the sensor is correctly connected to the computer via USB to TTL and provides power, you can see the correct COM port in the computer (check the COM port in “My Computer – Properties – Device Manager – Port”).

Open the data package, select “Debugging Software”—“Parameter Configuration Software”, find and open it.

If the COM port is not found in the device manager, it means that you have not installed the USB to TTL driver (included in the data package) or the driver has not been installed correctly, please contact a technician for help.

Use of Sensor Monitoring Software

1.  The configuration interface is shown in the figure. First, obtain the serial port number according to the method in Chapter 3.1 and select the correct serial port.
2.  Click the test baud rate of the software, the software will test the baud rate and address of the current device, the default baud rate is 9600bit/s, and the default address is 0x01.
3.  Modify the address and baud rate according to the needs of use, and at the same time, you can query the current functional status of the device.
4.  If the test is unsuccessful, please re-check the equipment wiring and driver installation

Communication protocol

Communication basic parameters

default is 9600bit/s

Data Frame Format Definition
Using Modbus-RTU communication protocol, the format is as follows: Initial structure ≥4 bytes of time

• Address code = 1 byte
• Function code = 1 byte
• Data area = N bytes
• Error check = 16-bit CRC code
• Time to end structure ≥ 4 bytes

Address code: the address of the transmitter, which is unique in the communication network (factory default 0x01).
function code:

function code| m e a n ing| o p erable r egister a dd r ess
---|---|---
0x03| read register data| 0x02、0x100～0x10D
0x10| write multiple registers| 0x102～0x10D

Data area: The data area is the specific communication data, pay attention to the high byte of the 16bits data first!CRC code: two-byte check code.
Host query frame structure:

address code

|

function code

| register start addre ss| register le ngth|

Check  code low

| Check  code high
---|---|---|---|---|---
1 Byte| 1 Byte| 2 Byte| 2 Byte| 1 Byte| 1 Byte

Slave response frame structure:

address c ode| function code| number of v alid bytes|

data area

| second data a rea| Nth  data area|

check code

---|---|---|---|---|---|---
1 Byte| 1 Byte| 1 Byte| 2 Byte| 2 Byte| 2 Byte| 2 Byte

register address

register

address

| quantity| meaning| status| data range
---|---|---|---|---
0x02| 1| Gas

concentration

| read only| 0～10000PPM
0x100| 1| Device model| read only| 0～0xFFFF
0x101| 1| Device     software

version

| read only| 0～0xFFFF
0x102| 10| device name| read and write| 0～0xFFFF
0x10C| 1| Device address| read and write| 0～0xFF
0x10D| 1| Serial               port

properties

| read and write| Same       with      Serial      Port

Properties Register

Serial port properties:

0: No verification (factory default)

 | 1: odd parity

2: Even parity

---|---
BIT7~BIT0| Baud rate selection 0: 1200bps

1: 2400bps

2: 4800bps

3: 9600bps（Factory default）

4: 19200bps

Communication protocol example and explanation
Example 1: Read the gas concentration value of device address 0x01 Query frame (hexadecimal):

address c ode| function co de| starting address|

Data length

|

Check  code low

| Check  code hi

gh

---|---|---|---|---|---
0x01| 0x03| 0x00  0x02| 0x00  0x01| 0x25| 0xCA

Response frame (hexadecimal):

address c ode

|

function cod e

| return valid number of b ytes| Gas concen tration value|

check code low

| check code high
---|---|---|---|---|---
0x01| 0x03| 0x02| 0x00 0x03| 0xF8| 0x45

Gas concentration calculation:
Concentration: 0003 H (hex) = 3PPM
Example 2: Modify the device address 0x01 to 0x02 Query frame (hexadecimal):

address code

|

function code

|

starting  address

|

Data  length

| data  area  w ord

Section  num

ber  (2*N)

|

data  area

|

check  code

---|---|---|---|---|---|---
0x01| 0x10| 0x01 0x0C| 0x00  0x01| 0x02| 0x00 0x02| 0x37 0x9D

Response frame (hexadecimal):

address c ode| function cod e| starting address|

Data length

| check code low| check code high
---|---|---|---|---|---
0x01| 0x10| 0x01 0x0C| 0x00 0x01| 0xC0| 0x36

Notice

1. It is forbidden to insert or unplug or touch the sensor on the module by hand.
2. It is forbidden to modify or shift the installation state of electronic components.
3. The module should avoid contact with organic solvents (including silica gel and other adhesives), coatings, pharmaceuticals, oils and high-concentration gases.
4. The module cannot withstand excessive impact or vibration.
5. The module needs to be preheated for more than 20 minutes when it is powered on for the first time.
6.  Do not use this module in systems involving personal safety.
7. Do not install the module in a strong air convection environment.
8.  Do not place the module in high-concentration organic gas for a long time.

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