Atal AT-VLC-R1D-RS3 User manual

1
User’s Manual
Carbon Dioxide Detector
Model: AT-VLC-R1D-RS3
Specifications
General Data
Power supply
24VAC/VDC±10%
Consumption
3.5 W max. ; 2.0 W avg.
Relay output
One relay output (resistive load max.5A) with the control mode
selection (control a fan or a CO2 generator)
RS485 interface
Modbus protocol
4800/9600(default)/19200/38400bps; 15KV antistatic protection,
independent base address.
LED light condition selectable
3-color mode (default)
Green: ≤1000ppm
Orange: 1000~1400ppm
Red: >1400ppm
Red flashing: CO2 sensor faulty
Working light mode
Green on: working
Red flashing: CO2 sensor faulty
OLED Display
Display CO2/Temp./ RH measurements
Operation condition
0~50℃; 0~95%RH, non condensing
Storage condition
-10~60℃ / 0~80%RH
Net Weight / Dimensions
190g /117mm(L)×95mm(W)×36mm(H)
Installation
wall mounting with 65mm×65mm or 2”×4”wire box
Housing and IP class
PC/ABS fireproof plastic material, protection class: IP30
Standard
EMC approval
Carbon Dioxide
Sensing element
Non-Dispersive Infrared Detector (NDIR)
CO2 measuring range
0~2000ppm (default)
0~5000ppm (selected in the advanced setup)
CO2 Accuracy @22℃(72℉)
±60ppm + 3% of reading or ±75ppm (whichever is greater)
Temperature dependence
0.2% FS per℃
Stability
<2% of FS over life of sensor (15 year typical)
Pressure dependence
0.13% of reading per mm Hg

2
Dimension and Mounting
◆Please note the power supply is 24VAC/VDC±10%. Don’t install the detector with over the voltage.
◆First of all, please prepare a flat head screwdriver and gently put it deep inside of the hole on the bottom
of the detector housing. Then slant the screwdriver and open the cover gently. Do not mount it near
diffuser or any steam source, in direct sunlight.
◆Mount the wall plate. Place the detector against the wall at desired location; make sure wires can be
passed through the notch on the wall plate.
◆Connect wires to terminal strips. Make sure wiring connection correct and secure.
◆Finally close the cover gently.
Wiring Diagram
Calibration
ABC Logic Self Calibration Algorithm
Response time
<2 minutes for 90% step change typical
Signal update
Every 2 seconds
Display resolution
1ppm
Warm-up time
2 hours (first time) / 2 minutes (normal operation)
Temperature and RH (option)
Temperature sensor (selectable)
Digital integrated temperature and humidity sensor or
NTC thermistor
Measuring range
-20~60℃/-4~140F 0~100%RH relative humidity
Accuracy
Temp.: <±0.5℃@25℃RH: <±3.0%RH （20%~80%RH）
Figure 1

3
Instruction
1. Please always cut off the power before open or clean the detector.
2. As powered on, the indicating light is red through the middle end of the face cover, and the buzzer alarm
is on, these indicate the transmitter working on. The number on OLED screen displays counts down from
10 seconds to 0, and then it starts displaying measured CO2, temperature and relative humidity values.
CO2 value starts from 2000ppm and it get stable in half an hour for the first time powered on.
3. After turn on the power, all parameters settings can be switched by SET key. The ▼ or ▲ key is used to
increase or decrease the parameter setting values.
4. There is a LED indicator light in the middle bottom of the front cover. Green stands for normal operation,
Red flash stands for CO2 sensor faulty. Green light is on when CO2 <1000ppm, Yellow light is on when
1000ppm≤CO2<1400ppm, Red light is on when CO2≥1400ppm.
5. The OLED screen shows CO2 measured value or CO2 / Temp measured values or CO2 / Temp / RH
Measured values. As shown in figure 1.
6. The relay output can be controlled automatically or manually, default auto control. Under relay control
manually, press and hold the "+" and "-" keys for 4 seconds to switch the relay control status, the display
cycled from AUTO-> RELAY ON-> RELAY OFF. Under relay control automatically, AUTO ON showed
on screen indicates relay is connected (Fan Normal Open). AUTO OFF indicates relay is disconnected.
7. Buzzer alarm (just for the models with relay): when the CO2 measured value exceeds the alarm setpoint
(1400ppm default), the sound alarm starts, and the customer can press the SET button to turn off the
alarm. If the alarm doesn’t be turned off, the buzzer will shut down by itself after 30 seconds. The alarm
setpoint can be changed by advanced parameter setup or Modbus RS485. Also, it also can be cancelled
by advanced parameter setup or Modbus RS485.
Advanced parameter Setup
Cut off the power and open the cover, there are four DIP switches on the middle right side of circuit board.
DIP1=OFF Normal use DIP1=ON Set advanced parameter Default: OFF
DIP2=OFF Centigrade DIP2=ON Fahrenheit Default: OFF
DIP3=OFF Analog linear output DIP3=ON PID output (only for CO2) Default: OFF
DIP4=OFF Relay setpoint CO2=800ppm, DIP4=ON Relay setpoint CO2=1200ppm Default: OFF
When DIP1=ON, all advanced parameters can be set. The ▼ or ▲ key is used to set or change the
corresponding set points. The digital flash indicates in the process of setting. After the digital isn’t flash, the
modified digital is saved. Press SET key can switch each parameter. As shown figure 4.
Note: DIP switches and button will effect when countdown of starting up is completed.

4
LCD
Parameter
Range of setup
Default
1
Temperature correction
+-5C/+-41F
0
2
Humidity correction
-5.0%RH~5.0%RH
0
3
CO2 correction
+-300ppm
0
4
Relay control logic selection
0- Increase CO2 1- Decrease CO2
1
5
Ineffective
- - -
0
6
PID control setpoint for CO2
400~5000ppm
800
7
Modbus comm address
1~247
1
8
Modbus comm baud rate
4800/9600/14400/19200/38400bps
9600
9
Modbus Parity bits and Stop bits
Selectable
1- None parity, 1 stop bit.
2- None parity, 2 stop bit.
3- Odd parity, 1 stop bit.
4- Even parity, 1 stop bit.
2
10
Warm up time
1~600s
10
11
Max range of CO2
measurement & set value
400~10,000ppm
2000
12
LED work mode
0- Three color (indicate changes of CO2 level)
1- Two color (Work indicating lights)
0
13
Alarm option
0- Ineffective 1- Effective
1
14
Alarm setpoint
400~5000ppm
1400
15
Green to Yellow critical point
400~5000ppm
1000
16
Yellow to Red critical point
400~5000ppm
1400
17
Ineffective
Please do not change them.
0
18
Ineffective
Please do not change them.
0
Modbus Register
Mode: RTU (MSB First)
Baud Rate: 1-4800 2-9600 3-14400 4-19200 5-38400 bps default: 2-9600bps
Start Bits: 1
Data Bits: 8
Stop Bits: 1 / 2 default : 2
Parity: None / Odd / Even default: None
Modbus Address: 1~247 default: 1
Register Map
Support Function: 3 4 6 16
Starting
Register
Decimal
Data Description
Function
Read/
Write
Length
Format
Valid Response

5
0
CO2 Measurement
4
R
2
Float inverse
0~5000 ppm
2
Temperature Measurement
4
R
2
Float inverse
0.0~50.0 ℃
4
Humidity Measurement
4
R
2
Float inverse
0.1~100.0 %RH
Starting
Register
Decimal
Data Description
Function
Read/
Write
Length
Format
Selection
Default
0
Modbus Address
3/6
R/W
1
INT16
1~247
1
1
Modbus rate
3/6
R/W
1
INT16
1-4800bps
2-9600bps
3-14400bps
4-19200bps
5-38400bps
2
2
Modbus Stop Bit
3/6
R/W
1
INT16
1-None 1Stop Bit;
2-None 2Stop Bit;
3-Odd 1Stop Bit;
4-Even 1Stop Bit
2
3
CO2 offset
3/6
R/W
1
INT16
-300~300ppm
0
4
Temperature offset
3/16
R/W
2
Float inverse
-5.0~5.0 ℃
0.0
6
Relative Humidity offset
3/16
R/W
2
Float inverse
-10~10 %RH
0.0
8
Logic of Relay Control
3/16
R/W
1
INT16
0- Increase CO2
1- Decrease CO2
1
10
Warm-up Time
3/6
R/W
1
INT16
1~600 Seconds
10
11
CO2 Max. Measurement
3/6
R/W
1
INT16
400~10,000 ppm
2000
12
CO2 PID Control Setpoint
3/6
R/W
1
INT16
400~5,000 ppm
800
13
CO2 Relay Control min. Setpoint
3/6
R/W
1
INT16
400~5,000ppm
780
14
CO2 Relay Control max.
Setpoint
3/6
R/W
1
INT16
400~5,000ppm
820
15
LED work mode
3/6
R/W
1
INT16
0- 3 color mode;
1- 2 color mode
0
16
Buzzer alarm
3/6
R/W
1
INT16
0- Disable
1- Enable
1
17
Buzzer alarm Setpoint of CO2
3/6
R/W
1
INT16
400~5,000ppm
1400
18
LED switch from green to yellow
3/6
R/W
1
INT16
400~5,000ppm
1000
19
LED switch from yellow to red
3/6
R/W
1
INT16
400~5,000ppm
1400