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VTS VENTUS PRO PVS PO 25 EC [2/16] Read this document carefully before attempting to start up the device
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VTS reserves the right to implement changes without prior notice.
www.vtsgroup.com Page 2 of 16 ver. 2.0 (11.2021)
1. Introduction
This document describes functionality of CO2 concentration transducer based on
integrated MH-Z19B sensor, equipped with RS-485 interface using MODBUS RTU
protocol and 0-5V / 0-10V analogue output.
NOTES:
1) Read this document carefully before attempting to start up the device!
2) The device must be installed by qualified staff only.
1.1. Functions of the device
▪ CO2 measurement
▪ 0-5V or 0-10V analogue output (hardware selectable range) proportional to
CO2 concentration
▪ 3 status LEDs
▪ RS485 serial interface for remote management (setup and reading of
measurement values)
◦ MODBUS RTU protocol
◦ integrated terminating resistor 120Ω
◦ communication in HALF DUPLEX mode
◦ hardware/software configurable address in the range 1-247
◦ hardware configurable communication baud rate: 19200, 9600, 4800,
2400
◦ software configurable communication baud rate: 115200, 57600,
38400, 19200, 9600, 4800, 2400
1.2. Device characteristics
The main function of the CO2 transmitter is to measure the CO2 concentration in
the air using an integrated MH-Z19B sensor. The measurement result, as well as the
sensor missing/error status, is processed by the built-in microprocessor and then
made available on the RS-485 bus via registers of the MODBUS RTU protocol.
Additionally, the measurement result is available as analog signal on the 0-5V / 0-
10V voltage output.
Содержание
- Co2 sens d modrtu 1
- Co2 transducer 1
- Device characteristics 2
- Functions of the device 2
- Introduction 2
- Read this document carefully before attempting to start up the device 2
- The device must be installed by qualified staff only 2
- General parameters of the transducer 3
- Parameters of co2 measurement 3
- Technical data 3
- All connections must be made in accordance with wiring diagrams 4
- Check all electrical connections prior to commissioning 4
- Installation 4
- Parameters of analogue output 4
- Parameters of serial interface 4
- Safety 4
- Shown in this document 4
- The device must be installed by qualified staff only 4
- Device design 5
- 5v or 10v 0 5v or 0 10v set on the configuration dip switch 2 see section 3 6
- Co ppm 6
- Description of terminals 6
- Exemplary values are shown in the table below exemplary values are shown in the table below 6
- Notes 1 the rxtx and rxtx signals must be connected to the a and b lines of the modbus bus respectively 2 the analogue output returns following voltage values 6
- Voltag 6
- Voltage v 2 2000 6
- Whereas the concentration value can be calculated basing on the voltage value form using the following formula 6
- 2 3 4 5 6 7 8 effect 7
- 2 3 4 5 6 effect 7
- Address address 1 7
- Address address 128 7
- Address address 16 7
- Address address 2 7
- Address address 32 7
- Address address 4 7
- Address address 64 7
- Address address 8 7
- Analogue output range 0 10v 7
- Analogue output range 0 5v 7
- Baudrate 19200 7
- Baudrate 2400 7
- Baudrate 4800 7
- Baudrate 9600 7
- Configuration of modbus bus serial port and analogue output 7
- Off 1 on configuration address 7
- Par no parity check 1 stop bit 7
- Par no parity check 2 stop bits 7
- Par parity check 1 stop bit 7
- Terminating resistor 120r switched off 7
- Terminating resistor 120r switched on 7
- The device address on the modbus bus is set using the right dip switch 7
- The purpose of the consecutive switches of the left dip switch is as follows default values are in bold 7
- Use baudrate and par from the software configuration 7
- Vts reserves the right to implement changes without prior notice 7
- Www vtsgroup com page 7 of 16 ver 2 11 021 7
- Led indicators 8
- Led link 8
- Led power 8
- Led sensor 8
- Note the configuration set by the means of dip switches is read once after device restart after switching on the power or pressing the reset button for this reason if the dip switch settings are changed during operation then after changing the settings it is necessary to restart the device by pressing the reset button or temporarily unplugging the power supply 8
- It is assumed that co2 concentration in the outdoor air amounts to 400 500 ppm the co2 concentration inside buildings is higher mainly due to the presence of people when there are no people in the building and the ventilation systems works properly the co2 concentration inside the building decreases to a level close to those of outdoor air 9
- It is recommended that devices on the modbus rs485 are connected in a daisy chain configuration whereby 120r terminating resistors should be connected between a and b lines of the bus at both ends of the chain close to the outer devices this resistor is built in in the co2 sens d modbrtu transducer and can be switched on using the no 1 switch on the configuration dip switch see section 3 9
- Moreover shielded cables should be used when the device is operated in high interference environments and the shield should be connected to the nearest pe point on the power supply side 9
- Recommendations for installation 9
- The automatic zero calibration abclogic function 9
- Abclogic is an algorithm for long term tracking of co2 concentration and adjusting the sensor characteristics in the low concentration range the sensor stores low values of co2 concentration from many last days which enables taking intelligent account of periodical co2 concentration level increases e g when rooms were used 24 hours per day over a few days as a result of the abclogic algorithm the automatic zero calibration of the sensor is carried out the automatic calibration abclogic is designed for applications where rooms remain unoccupied for several hours per day as a result co2 concentration values periodically drop to low values similar to those outside the building in contrast in an environment where the level of co2 concentration reaches high values and doesn t drop to low values the abclogic system should be switched off because it would adjust automatic calibration to the lowest levels distorting the values indicated by the sensor in the sensor described in this document th 10
- Modbus protocol 10
- Register map 10
- During a single password entry both with function 0x06 and 0x10 in case of a 11
- Parameter at the same time using the 0x10 function with the corresponding values according to the command table or by writing single registers using 0x06 or 0x10 function with the latter writing of a valid password causing the execution of the command 11
- Password match the correctness of information in command and parameter registers is checked and if correct the command is executed 11
- Reading registers from addresses not listed in this table results in 0x02 exception 11
- Specifying an incorrect or out of range parameter value results in entering the value 11
- The device is configured by writing three registers password command 11
- Xeeee into the command register 11
- 3 reserved 2 3 reserved 12
- Bit no 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 12
- Co2 duct sensor in basic hardware version returns the value b1100000100000000 0xc100 co2 duct sensor in basic hardware version returns the value b1100000100000000 0xc100 12
- Dev_id_reg addr 11 0x000b read only 12
- Name n3 a3 b3 rev3 12
- Protocol functions 12
- Room type 1 room type 12
- Soft_ver_reg addr 12 0x000c read only 12
- Software version is represented as a sting of 4 characters n abrev where n a b are digits in the the 0 range rev with values 0 is a letter in the range a j examples 0x0000 represents software version 0 0a 0x4321 4 2b 0x2345 2 4f 12
- T1 value 0 type 0 duct type 12
- This register is used to store device id meaning of bits dev4 b11000 fixed value meaning air parameter sensors hv1 value 0 hardware version options4 values 0 1 device type b10000 co2 transducer with mh z19b sensor 12
- Command format 13
- Error format 13
- Reading the contents of a group of output registers 0x03 13
- Response format 13
- Writing single 16 bit registers 0x06 13
- Command format 14
- Error format 14
- Response format 14
- Writing a group of output registers 0x10 14
- Character byte format 15
- Data format 15
- Description of errors 15
- Error format 15
- Order of bytes in 16 bit data fields in a transmission frame 15
- The following figure shows the byte order of the 16 bit data fields for 16 bit data fields the correct byte order is that the older byte is transmitted first then the younger byte hi lo big endian while for the crc field the younger byte is transmitted first then the older byte lo hi little endian 15
- The following figure shows the format of a byte transmitted in the modbus rtu protocol each transmitted character has 10 or 11 bits which are sent in order from the least significant to the most significant 15
- Crc check sum 16
- Vts reserves the right to implement changes without prior notice 16
- Www vtsgroup com page 16 of 16 ver 2 11 021 16
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