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ELGAS-2 (CP II) communication protocol

Supported device types and versions 
Communication line configuration
Communication line configuration
I/O tag configuration
Literature
Changes and modifications
Document revisions

Supported device types and versions

The protocol supports the communication with devices ELCOR-2 and microELCOR-2 (made by company ELGAS) that recalculate a gas quantity.

Communication line configuration

The asynchronous transmission parameter are set according to setting of specific device.

Communication station configuration

  • Communication protocol: Elcor ELGAS-2 (CP II).
  • Station address:

Node address: value in the range of 0 to 65535.

Measure address: value in the range of 0 to 255.

If the address and measure has the 0 value the device must answer obligatorily.

Password for reading: maximum 6 characters is allowed if the password is set in device (only ELCOR-2).


Station protocol parameters

Configuration dialog box  - tab „Parameters".
They influence some optional parameters of protocol. Following station protocol parameters can be set:

Table 1

Full name Meaning Unit Default value
Device Type Selection of device type. ELCOR-2 or microELCOR-2 ELCOR-2
Retry Count Delay between request retry in case of a communication failure.   3
Wait First Timeout Delay after sending the request before reading the response. ms 100 ms
Wait Timeout Delay between response readings till its completing. ms 100 ms
Max. Wait Retry Retry count of response reading till its completing.   30
Static Data Read Period Static - configuration data read period (only microELCOR-2). min 60 min
Hourly Archive Periodic Reading A period for reading value of hourly archives (0-60 min). Value 0 disables the reading. min 0 min
Wake Up Sequence Length Length 'wake-up' of data which is entered before the call after longer communication pause. 0 .. 50 bytes 25 bytes
Wake Up Each Query Insert 'wake-up' data before each query. YES/NO NO
Wake Up Character Form 'wake-up' data sequence from the characters that has this value. 0 .. 255 255
Group Source Address Group source address (address of D2000 KOM process). 0 .. 65535 0
Source Address Source address (address of D2000 KOM process). 0 .. 255 0
Full Debug High level of communication tracking, the loaded values of I/O tags and other debug information are shown. YES/NO NO

I/O tag configuration

Possible value types of I/O tags: Di, Ai, Ci, TxtI, TiA.

Device ELCOR-2

Table 2 contains the list of main parameters of device.
Tables 3 to 8 contains the list of variable configuration and informative data according to parameter type. DESC(ind) parameter represents the common data of all parameters. It describes the quantity. The current value of quantity can be acquired by configuration of the I/O tag with numerical address - index ind (number from 1 and more). To find out the technical units - configure text of I/O tag with address UNIT(ind).


Table 2 - Device parameters - Main device parameters

Object description Value type Address Units
Serial number of device Ci, TxtI SN  
Referential temperature Ai TB °C
Referential pressure Ai PB kPa
Firmware version TxtI FW  
Station name TxtI DESC  
CO2 concentration Ai TAB(0) %
N2 concentration Ai TAB(1) %
Heat of combustion Ai TAB(2) MJ/m3
Relative density Ai TAB(3)  
H2 concentration Ai TAB(4) %
H2S concentration Ai TAB(5) %
He concentration Ai TAB(6) %
H2O concentration Ai TAB(7) %
O2 concentration Ai TAB(8) %
Ar concentration Ai TAB(9) %
CO concentration Ai TAB(10) %
C1H4 concentration Ai TAB(11) %
C2H6 concentration Ai TAB(12) %
C3H8 concentration Ai TAB(13) %
iC4H10 concentration Ai TAB(14) %
nC4H10 concentration Ai TAB(15) %
iC5H2 concentration Ai TAB(16) %
nC5H2 concentration Ai TAB(17) %
C6H14 concentration Ai TAB(18) %
C7H16 concentration Ai TAB(19) %
C8H18 concentration Ai TAB(20) %
C9H20 concentration Ai TAB(21) %
C10H22 concentration Ai TAB(22) %

Table 3 - Device parameters - Analogue parameter

Object description Value type Address Units
Analogue parameter - transducer serial No. TxtI, Ci SN(ind)  
Analogue parameter - upper limit of measuring range Ai HL(ind)  
Analogue parameter - lower limit of measuring range Ai LL(ind)  
Analogue parameter - technical units TxtI UNIT(ind)  
Analogue parameter - name TxtI DESC(ind)  

Table 4 - Device parameters - Counter

Object description Value type Address Units
Counter - serial number of gas meter TxtI, Ci SN(ind)  
Counter - technical units TxtI UNIT(ind)  
Counter - name TxtI DESC(ind)  

Table 5 - Device parameters - Error counter

Object description Value type Address Units
Error counter - primary counter number TxtI, Ci CNT(ind)  
Error counter - technical units TxtI UNIT(ind)  
Error counter - name TxtI DESC(ind)  

Table 6 - Device parameters - Standard counter

Object description Value type Address Units
Standard counter - primary counter number TxtI, Ci CNT(ind)  
Standard counter - calculation number TxtI, Ci CLC(ind)  
Standard counter - technical units TxtI UNIT(ind)  
Standard counter - name TxtI DESC(ind)  

Table 7 - Device parameters - Conversion factor

Object description Value type Address Units
Conversion factor - analogue (pressure) number Ci CNTP(ind)  
Conversion factor - analogue (temperature) number Ci CNTT(ind)  
Conversion factor - pressure error volume Ai DEFVALP(ind) kPa
Conversion factor - temperature error volume Ai DEFVALT(ind) °C
Conversion factor - compressibility error volume Ai DEFVALK(ind)  
Conversion factor - technical units TxtI UNIT(ind)  
Conversion factor - name TxtI DESC(ind)  

Table 8 - Device parameters - Standard flow rate

Object description Value type Address Units
Standard flow rate - primary flow number Ci CNT(ind)  
Standard flow rate - calculation number Ci CLC(ind)  
Standard flow rate - technical units TxtI UNIT(ind)  
Standard flow rate - name TxtI DESC(ind)  

Device microELCOR-2

Address of I/O tag can be data from column "Address" or "Default address".

Table 9 - Actual values

Object description Value type Address Default address Units
Primary volume Ai OH.1 V m3
Standard volume Ai OH.2 VN Nm3
Error primary volume Ai OH.3 VEST m3
Error standard volume Ai OH.4 VNEST Nm3
Primary flow rate Ai OH.5 Q m3/hour
Standard flow rate Ai OH.6 QN Nm3/hour
Compressibility ratio Ai OH.7 K  
Actual pressure Ai OH.8 P kPa
Actual temperature Ai OH.9 T K
Calculation number Ai OH.10 Z  
Device temperature Ai OH.11 TPR °C
Operating value - rest (only in VF input) Ai OH.12 VZB  

Table 10 - Service data

Object description Value type Address Default address Units
Type + serial number TxtI SE.1 VCE  
Serial number of temperature sensor TxtI SE.2 VCT  
Serial number of pressure transducer TxtI SE.3 VCP  
Version SW+HW TxtI SE.4 VER  
Customer number TxtI SE.5 CZ  
Serial number of gas meter TxtI SE.6 PVC  
Network address TxtI SE.7 ADR  
Constant of gas meter Ci SE.8 KP 0=1, 1=0.1, 2=0.01, 6=100, 7=10
Measuring interval Ci SE.9 IM  
Interval of data sending through serial line Ci SE.10 IV  
Start hour of gas day Ci SE.11 CD  
Start of measurement TiA SE.12 DSM  
Date and time of device TiA SE.13 DAT  
Battery capacity Ci SE.14 BAT %
Actual status TxtI SE.15 OS  
Configuration bytes TxtI SE.16 KB  
Communication rate of serial number Ci SE.17 RK 4=4800, 5=9600, 6=19200
CRC 51 Ci SE.18 C1  
CRC MSP 430 Ci SE.19 C2  
CRC EEPROM1 Ci SE.20 C3  
CRC EEPROM2 Ci SE.21 C4  
CRC EEPROM3 Ci SE.22 C5  
Battery voltage Ai SE.23 UPRHEX V
Display configuration Ci SE.24 KDIS  
Bits of permission to write the items TxtI SE.25 W_RUN  
Customer's region TxtI SE.26 REGION  
Saving interval in hourly archive Ci SE.27 IU  
Quantity of diff. pulses between IMP and IMP1 Ci SE.28 IMP1_PI 0=off, 255=on permanently
Input pulse ratio Ci SE.32 I_V_DP  
Bits of record permission in RUN by a user Ci SE.33 WU_RUN  
Actual status 2 Ci SE.34 OS2  
Setting of pulse ratio of gas meter VF on m3 Ci SE.35 KPVF  

Table 11 - Parameters

Object description Value type Address Default address Units
Base pressure Ai PA.1 PN kPa
Base temperature Ai PA.2 PT °C
Default pressure Ai PA.3 PEST kPa
Default temperature Ai PA.4 TEST °C
Default compressibility level Ai PA.5 SK  
Min. pressure limit Ai PA.6 PMIN kPa
Max. pressure limit Ai PA.7 PMAX kPa
Min. temperature limit Ai PA.8 TMIN °C
Max. temperature limit Ai PA.9 TMAX °C
Limit of max. flow rate Ai PA.10 QMAX m3/hour
Method of compressibility calculation Ci PA.11 MK  
CO2 concentration Ai PA.12 KCO2 %
N2 concentration Ai PA.13 KN2 %
H2 concentration Ai PA.14 KH2 %
Relative density Ai PA.15 KD %
Heat of combustion Ai PA.16 KHON kWh/m3

Table 12 - Minima/maxima

Object description Value type Address Default address Technical units
Pressure under range Ai MI.1 PMMIN kPa
Time of pressure under range TiA MI.2 DPMMIN  
Pressure above range Ai MI.3 PMMAX kPa
Time of pressure above range TiA MI.4 DPMMAX  
Temperature under range Ai MI.5 TMMIN °C
Time of temperature under range TiA MI.6 DTMMIN  
Temperature above range Ai MI.7 TMMAX °C
Time of temperature above range TiA MI.8 DTMMAX  
Flow rate above range Ai MI.9 QMMAX m3/hour
Time of flow rate above range TiA MI.10 DQMMAX  
Time of reset time (minima/maxima) TiA MI.11 DNUL  

Parameters and minima/maxima are read in period which is set in protocol parameter value Static Data Read Period.

Literature

  • Description of system μ-ELCOR and microELCOR-2 - operating schedule (Elgas 1. 6. 2006)
  • Reference books of producer ELGAS s.r.o.

Changes and modifications

-

Document revisions

  • Ver. 1.0 - April 22th, 2009 - creating of document.

Related pages:

Communication protocols

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