Condition:New
Type:Logic ICs
First、Product overview
This product uses Figaro Figaro carbon monoxide sensor as the core sensor. When a fire occurs, a large amount of CO gas will be generated, which will be detected by the sensor, and then an audible and visual alarm will occur. Compared with the conventional photoelectric smoke alarm, this product has sensitivity High, less false alarms, and long service life. This product can also be used as a CO transmitter to monitor the specific content of CO in real time. This product adopts RS485 communication and MODBUS-RTU protocol, which is convenient for networking and is widely used in high-end fire and smoke detection occasions.
Second、Technical Parameters
Measuring range
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0-1000PPM
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Measurement resolution
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1PPM
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Zero drift
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<20PPM (within service life)
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Precision
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±15%FS
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Preheat time
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5 minute
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Voltage
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DC8-30V，Power consumption<1W
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Working environment
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Temperature 0～50℃; humidity 5～95% non-condensing
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Dimensions
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Length*width*height 103*103mm*52mm;
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Installation method
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Indoor ceiling installation
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Shell material
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PC+ABS，Flame retardant
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RS485 communication
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RS485 interface, MODBUS-RTU protocol, baud range rate 1200~19200bps, address range 1-63 can be set by software. The default communication address is 1, and the baud rate is 9600bps. The default data format is 1 start bit, 8 data bits, 1 stop bit, and no parity.
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Alarm
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Sound and light alarm
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Alarm test
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Press the button to test whether the alarm system is functioning well
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Third、Dimensions, wiring definition
1、Dimensions
2、Wiring definition
Terminal number
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Terminal block
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Definition
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Explain
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1
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+
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Power +
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8-30V DC
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2
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-
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Power -
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3
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A
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RS485 +
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RS485 communication
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4
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B
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RS485 -
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Fourth、MODBUS-RTU communication protocol
4.1 Basic communication parameters
The data is in the form of 8 parity bits, 1 stop bit. Factory default address is 1, baud rate is 9600bps, baud range rate is 1200 ~ 19200bps, which can be set by software.
4.2 Message format
Function code 03H, query the contents of the slave device register
The master device sends a message:
Slave device address
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Function code
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Register start address
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Number of registers
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CRC check
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1 byte
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1 byte
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2 byte
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2 byte
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2 byte，Low byte in front, high byte in the back
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Slave device return message：
Slave device address
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Function code
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Number of registers
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Register content
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CRC check low byte
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1 byte
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1 byte
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1 byte
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2 * number of registers, bytes
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2 bytes, low byte first, high byte last
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Data comparison table:
Register address
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PLC or configuration address
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Content description
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Read write properties
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Data range and description
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1
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40002
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ambient temperature
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03 read
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Unit ℃, resolution 1 ℃
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2
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40003
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CO concentration
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03 read
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Unit ppm, resolution 1ppm
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3
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40004
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Sensor zero calibration value
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03 read
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For internal calibration
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4
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40005
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Sensor sensitivity
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03 read
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For internal calibration
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5
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40006
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CO alarm upper limit
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03 read 06 write
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Unit ppm, range 0-200ppm, default 50
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6
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40007
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Alarm status
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03 read
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0: no alarm, 1: alarm
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|
|
|
|
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701
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40702
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Slave baud rate
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06 write
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03h ~ 07h corresponds to 1200-19200bps, the default is 06h (9600)
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702
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40703
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Slave parity check
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06 write
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00: no check, 01: odd check, 02: parity, default: 00
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Function code 06h, set slave register content
Message sent by main equipment:
Slave device address
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Function code
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Register address
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Register content
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CRC check
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1 byte
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1 byte
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2 byte
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2 byte
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2 byte，Low byte in front, high byte in the back
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Slave device return message：
Slave device address
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Function code
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Register address
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Register content
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CRC check
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1 byte
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1 byte
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2 byte
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2 byte
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2 byte，low byte first, high byte last
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4.3 Communication protocol example
Read slave address 01 co value
Main equipment sends message
Slave device address
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Function code
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Register start address
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Number of registers
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CRC check
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0x01
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0x03
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00 02
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00 01
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0x25 0xCA
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Slave device return message：
Slave device address
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Function code
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Number of registers
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Register content
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CRC check
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0x01
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0x03
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02
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0x00 0x14
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0xB8 0x4B
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0x0014 (HEX) = 20 ppm
4.3 RS485 communication address is set by dial switch：
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