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VENTUS PRO PVS 27x27
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VTS VENTUS PRO PVS 27x27 [5/16] Device design

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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

VTS VENTUS PRO PVS 27x27 [5/16] Device design

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