Coronis WaveTherm DALLAS Instruction Manual

File : CS-SUP-MUTI-WTHERMAPP-E01.sxw
WaveTherm modules – application handbook page 1 of 65

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REVI ION HI TORY
Rev. # Description Author Date Comments
1 Original d cument RCS 02/02/05 Versi n 1
2 Add n text FCC RCS 17/02/05 Versi n 2
UPPORTED FIRMWARE VER ION
➢WaveTherm - DALLA
Eur pean Versi n
Manual versi n Firmware versi n Date
1.0 V 01.04 15/10/04
US Versi n
Manual versi n Firmware versi n Date
1.0 V 81.05 15/10/04
➢WaveTherm - PT100
Manual versi n Firmware versi n Date
1.0 V 01.02 15/10/04
➢WaveTherm - PT1000
Manual versi n Firmware versi n Date
1.0 V 01.00 15/10/04
This device complies with part 15 of the FCC rules. Operation is subject to the
following two conditions : this device may not cause harmful interference and
this device must accept any interference received including interference that
may cause undesired operation.
Caution : any changes or modifications not expressly approved by Coronis-
Systems could void the user's authority to operate the equipment.
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TABLE OF CONTENT
1 PRE ENTATION........................................................................................................................... 6
2 REFERENCE DOCUMENT ......................................................................................................... 6
3 PRE ENTATION OF THE WAVETHERM MODULE FUNCTIONALITIE ................................ 7
3.1 SENSORS INTERFACE.........................................................................................................................7
3.2 READ TEMPERATURES.......................................................................................................................8
3.3 PERIODIC TEMPERATURE READING (DATALOGGING)..................................................................8
3.4 MANAGEMENT OF THRESHOLD ALARMS........................................................................................9
3.4.1 Threshold Alarm Detection.............................................................................................................9
3.4.2 Storage of Threshold Alarm occurences........................................................................................9
3.4.3 Transmission of a Threshold Alarm Frame.....................................................................................9
3.5 STORAGE OF CALIBRATION PARAMETERS..................................................................................10
3.6 WAKE-UP SYSTEM MANAGEMENT..................................................................................................10
3.7 AUTOMATIC TRANSMISSION OF FAULTS...................................................................................... 10
3.8 SENSOR FAULT DETECTION (IF SUPPORTED BY THE MODULE)...............................................11
3.9 END OF BATTERY LIFE DETECTION................................................................................................11
4 DATA EXCHANGE PRINCIPLE WITH A WAVETHERM MODULE .......................................... 12
5 INFORMATION RELATIVE TO THE PROBE A OCIATED WITH THE WAVETHERM
MODULE ...................................................................................................................................... 15
5.1 DALLAS PROBES...............................................................................................................................15
5.1.1 Coding of temperatures for the DA AS probe type DS18B20 ...................................................15
5.1.2 Probe ID........................................................................................................................................15
5.1.3 Setting of the probe coefficient parameters..................................................................................16
5.2 PT100 AND PT1000 PROBES.............................................................................................................17
5.2.1 Representation of temperature values..........................................................................................17
5.2.2 Calibration of radio module...........................................................................................................18
5.2.3 Setting of probe coefficient parameters........................................................................................19
6 MODIFICATION OF THE INTERNAL PARAMETER ................................................................21
6.1 INTERNAL PARAMETERS LIST ACCESSIBLE BY RADIO COMMANDS....................................... 21
6.1.1 Parameters common to all WAVETHERM versions.....................................................................21
6.1.2 Parameters specific to the WaveTherm – DA AS module.........................................................22
6.1.3 Parameters specific to the WaveTherm – PT100 module............................................................22
6.1.4 Parameters specific to theWaveTherm – PT1000 module...........................................................23
6.1.5 Definition of the module control bytes...........................................................................................24
6.2 PRINCIPLE OF READING AND WRITING OF INTERNAL PARAMETERS......................................25
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7 WAVETHERM MODULE FUNCTION ...................................................................................... 27
7.1 PARAMETER SETTING OF THE WAVETHERM MODULE...............................................................27
7.1.1 Reading of the module type..........................................................................................................27
7.1.2 Reading of the firmware version...................................................................................................28
7.1.3 Reading of the date and time of the module.................................................................................29
7.1.4 Setting the date and time of the module.......................................................................................30
7.1.5 Access to the user data area........................................................................................................31
7.1.6 Initialization of the sensors............................................................................................................33
7.2 READING THE CURRENT VALUE OF THE TEMPERATURE SENSORS........................................34
7.2.1 Information concerning precision..................................................................................................34
7.2.2 Description of the commands to be used.....................................................................................34
7.2.3 Reading the current ohmic values of the sensors.......................................................................36
7.3 WAKE-UP SYSTEM MANAGEMENT..................................................................................................37
7.3.1 Description of the parameters used..............................................................................................37
7.3.2 Choice of wake-up mode..............................................................................................................37
7.3.3 Set a new wake-up period............................................................................................................38
7.3.4 Set a fixed wake-up period for certain days of the week..............................................................38
7.3.5 Set day/night system parameter without distinction of days of the week.................................... 38
7.3.6 Set the day/night system parameters according to day of the week...........................................40
7.4 PARAMETER SETTING OF THE DATALOGGING MODE................................................................41
7.4.1 Description of the parameters used..............................................................................................41
7.4.2 Precision level of the measurement..............................................................................................41
7.4.3 Activating the datalogging mode...................................................................................................42
7.4.4 Index logging in time steps...........................................................................................................43
7.4.5 Index logging once a week...........................................................................................................44
7.4.6 Index logging once a month..........................................................................................................45
7.4.7 Reading the logged temperature values.......................................................................................46
7.5 ADVANCED DATALOGGING.............................................................................................................48
7.5.1 Description of the parameters used..............................................................................................48
7.5.2 Parameter setting of the Advanced Datalogging mode................................................................49
7.5.3 Principle of reading the temperature, and re-initializing the storage table....................................49
7.5.4 Reading the totality, or a part of the storage table........................................................................51
7.5.5 Structure of the data when two sensors are activated..................................................................54
7.5.6 Usage limit of the multi-frame mode.............................................................................................55
7.6 MANAGEMENT OF THRESHOLD ALARMS......................................................................................56
7.6.1 Description of the parameters used..............................................................................................56
7.6.2 Precision level of the measurement..............................................................................................57
7.6.3 Format of the temperature information.........................................................................................57
7.6.4 Principle of the detection modes...................................................................................................58
7.6.5 Selection of the threshold detection modes, and activation of the detection................................59
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7.6.6 Configuration of the measurement period of the threshold detection...........................................59
7.6.7 Reading the threshold detection table..........................................................................................60
7.7 MANAGEMENT OF THE ALARM FRAMES........................................................................................61
7.7.1 Description of the parameters used..............................................................................................61
7.7.2 Configuration of the route to reach the alarm frames recipient.................................................... 61
7.7.3 Configuration of the alarms to be sent..........................................................................................62
7.7.4 Triggering an alarm frame............................................................................................................63
7.8 END OF BATTERY LIFE DETECTION................................................................................................64
7.8.1 Description of the parameters used..............................................................................................64
APPENDIX A : ET OF THE APPLICATIVE COMMAND .............................................................................65
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1 PRE ENTATION
This d cument describes the functi nalities f WaveTherm radi m dules :
WaveTherm – DALLAS Used with DA AS sensor
WaveTherm – PT100 Used with PT100 sensor
WaveTherm – PT1000 Used with PT1000 sensor
This d cument defines in an exhaustive way the applicatives data relating t serial dial g frames between a
Wavecard and a h st equipment , used t reach the data f the WaveTherm radi m dule.
2 REFERENCE DOCUMENT
Ref Title Reference Version Date
DR[1] WaveCard user handbook
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3 PRE ENTATION OF THE WAVETHERM MODULE FUNCTIONALITIE
3.1 SENSORS INTERFACE
➢WaveTherm – DALLA :
The m dule is designed t manage t the maximum tw DALLAS temperature sens rs (type
DS18B20).
This DALLAS sens r f 1-wire type integrates a 12-bit internal c nverter.
Each external sens r is c nnected t the m dule by a cable equipped with a BINDER c nnect r f
3-pin type.
An aut matic identificati n f the temperature sens rs all ws t mem rize the identifier f the
sens rs. This phase is aut matically carried ut when p wering the m dule
and is als activated n a specific radi request (in this case, The m dule returns by radi the
identifiers f the sens rs).
➢WaveTherm – PT100 :
The WaveTherm-PT100 m dule has the p ssibility t manage 1 r 2 PT100 temperature sens rs.
The pr bes are c nnected t the m dule thr ugh impervi us c nnect rs all wing t c nnect 2, 3 r 4
wires pr bes.
➢WaveTherm – PT1000 :
The WaveTherm-PT1000 m dule has the p ssibility t manage 1 r 2 PT1000 temperature sens rs.
The pr bes are c nnected t the m dule thr ugh impervi us c nnect rs all wing t c nnect 2, 3 r 4
wires pr bes.
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3.2 READ TEMPERATURES
The WaveTherm m dule has the f ll wing p ssibilities:
T read the current temperature ;
T transmit the last N temperatures st red, in ne frame.
If tw temperature sens rs are used, then the WaveTherm return the last N/2 values f each sens r.
•WaveTherm – DALLAS : N = 48 temperatures
•WaveTherm – PT100 : N = 24 temperatures
•WaveTherm – PT1000 : N = 24 temperatures
3.3 PERIODIC TEMPERATURE READING (DATALOGGING)
Peri dic reading f temperatures is available in tw versi ns. In b th cases, the m dule may be c nfigured t
st re the temperatures measured peri dically (in time intervals ranging fr m a minute t several h urs), nce
a week r nce a m nth.
➢tandard datalogging :
Peri dic c llecti n f temperature measurements up t N temperatures. In this case, it functi ns in
'permanent loop' m de, i.e. the m st recent measurements replace the ldest measurements.
WaveTherm – DALLAS : N = 48 temperatures;
WaveTherm – PT100 : N = 24 temperatures;
WaveTherm – PT1000 : N = 24 temperatures.
➢Advanced datalogging:
Peri dic c llecti n f temperature measurements up t M temperatures. In this case, it functi ns in
'stop memory full' m de.
WaveTherm – DALLAS : M = 4500 temperatures;
WaveTherm – PT100 : M = 2000 temperatures;
WaveTherm – PT1000 : M = 2000 temperatures.
Remark : Only the 'Stop memory full' mode is currently operational : when the memory corresponding to N
temperatures is full, datalogging stops automatically.
A new parameter setting cycle must then be started with a specific radio command.
A future upgrade will enable permanent looping with indication of looping.
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3.4 MANAGEMENT OF THRESHOLD ALARMS
The WaveTherm m dule detects when the values exceed the thresh ld levels (high r l w) f r a given peri d
f time.
The WaveTherm – PT100 and PT1000 may be c nfigured with a precisi n level ffering a m re reliable
measurement even in envir nments with excessive interference (see chapter 7.2.1).
Three types f thresh ld alarm detecti n meth ds may be pr grammed :
immediate thresh ld alarm detecti n
thresh ld alarm detecti n f r a given c ntinu us peri d f time (successive m de)
thresh ld alarm detecti n f r a t tal peri d f time (cumulative m de)
3.4.1 Threshold Alarm Detection
Thresh ld alarm detecti n requires peri dic measurement f the temperature f r a predefined peri d. The
value f this peri d enables establishment f the thresh ld alarm detecti n reactivity.
This period is set independent of the datalogging period. However for power saving reasons it is
recommendable to set the datalogging period as a multiple of the threshold alarm detection period.
The f ll wing parameters apply t this functi n:
High thresh ld alarm,
L w thresh ld alarm,
Thresh ld excess time (used in cumulative and successive m de),
M de parameter setting byte (high thresh ld enabled, l w thresh ld enabled, immediate,
successive r cumulative m de).
3.4.2 Storage of Threshold Alarm occurences
Thresh ld alarms are st red in a mem ry z ne which may be accessed by radi . If the number f thresh ld
alarms exceeds the mem ry st rage capacity, the ldest alarms rec rded are deleted.
The f ll wing inf rmati n is rec rded in the table:
Thresh ld alarm detecti n date
Thresh ld alarm detecti n durati n
The average value f all measurements rec rded during the alarm peri d.
3.4.3 Transmission of a Threshold Alarm Frame
The m dule may be pr grammed t transmit a radi frame as s n as a thresh ld alarm is detected.
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3.5 STORAGE OF CALIBRATION PARAMETERS
The WaveTherm m dule manage a n n-v latile mem ry area accessible by radi c mmand, and all wing t
st re up t 32 bytes.
This area is n t used by the internal pr cess, and is generally used t st re the parameters relative t the
calibrati n f the m dule, and can be read, r m dified by specifying the start address, and the size f the
data.
3.6 WAKE-UP SYSTEM MANAGEMENT
In rder t reduce m dule p wer c nsumpti n, a wake-up peri d parameter setting system is inc rp rated.
This system enables m dificati n f the m dule wake-up peri d (default setting 1 s) by entering a time and
day f the week :
The wake-up peri d default value may be m dified;
Tw time-wind ws with different wake-up peri ds may be defined;
Each day f the week may be set in ne f the f ll wing three cases :
•Wake-up peri d default setting
•Wake-up acc rding t predefined time wind ws
•N wake-up peri d (f r safety reas ns, the m dule is n t disabled n recepti n and it
wakes up every 10 sec nds)
Note : The system is disabled by default and must be enabled by writing a specific profile in the
wake-up system status word.
3.7 AUTOMATIC TRANSMISSION OF FAULTS
The WaveTherm m dule ffers the p ssibility t aut matically transmit radi frames when an ccurrence is
detected.
The f ll wing ccurrences may pr v ke an aut matic alarm:
Thresh ld detecti n (see chapter 7.6)
End f battery life detecti n (see chapter 7.8)
Pr be fault detecti n (WaveTherm – PT100 and PT1000 only)
It is p ssible t select f r each type f ccurrence whether r n t an alarm frame is t be sent.
The radi address f the receiver m dule and the repeater path must be preset with a radi signal.
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3.8 SENSOR FAULT DETECTION (if supported by the module)
F r all m dules, temperature pr be absence r err r detecti n is carried ut during a write request and is
indicated by the presence f a specific value which d es n t c rresp nd t a p ssible temperature value.
H wever, in the case f the WaveTherm – PT100 and WaveTherm – PT1000 modules only, after
detecti n f a pr be fault, the m dule carries ut the f ll wing perati ns:
rec rds the detecti n date in internal parameters (0x91 ; 0x92).
If required, transmits an immediate pr be fault detecti n radi frame.
3.9 END OF BATTERY LIFE DETECTION
T detect the end f battery life, the WaveTherm m dule uses the p wer metering principle rather than
measurement f the battery v ltage. Lithium batteries are, in particular during passivati n, unsuitable f r the
v ltage measurement meth d t determine the remaining capacity.
The WaveTherm rec rds and evaluates all events (measurements, transmissi ns) t decrement the p wer
meter acc rding t the battery used. When the meter passes bel w a predefined thresh ld, the “end f
battery life” is signalled with the Application Status byte.
The initial value f the end- f-life meter is fact ry-set. It depends n the type and number f batteries used.
When the end of battery life is detected, the detection date is memorised and may be read with a radio
command.
Please refer t the WaveTherm m dule technical specificati ns, f r m re details n the life f the m dules.
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4 DATA EXCHANGE PRINCIPLE WITH A WAVETHERM MODULE
The WaveTherm m dule uses the WAVENI pr t c l.
The ch ice f m de used is initiated by the read element which uses a different set f c mmands (see
WaveCard d cument) when sending c mmands t the WaveCard.
The f ll wing chart indicates the read m des p ssible as well as their typical applicati ns.
Read mode Description Recommendations
Peer-to-peer Individual reading with re-transmission management
in case o no reply
Standard use
Polling This mode enables successive polling o several
modules in a single operation .
The principle consists o waking up several modules
with the 1st radio transmission.
To be used when module reading time is
an important actor.
Re-transmission not possible.
Broadcast and multicast (*) This mode enables use o a single rame to address
all radio modules within reception range.
The multicast mode may only address one group o
modules.
This mode enables reading o modules
without knowing their radio address.
Type o use: detection o radio modules
within range o the emitter module
(installation phases).
➢Additional functions:
Additional
functions Compatibility Description Recommendations
Repeater Only used in point-
to-point mode.
This unction enables use o a radio module to relay
a rame which was not initially intended or this
module.
This is a de ault unction o the WaveTherm module,
i.e. it may be read via several repeaters but may
also act as a repeater itsel when reading another
unit.
This unction is used when the caller
module and the target WaveTherm
module are outside radio range.
The maximum number o repeaters is
limited to 3.
Attention: collection of data in multi-frame mode (advanced datalogging) is not possible in
repeater mode.
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➢Example in Point-to-point mode :
Remark : Generally, the exchanges examples given in this document will be in Point-to-point mode,
except when the context depends directly on the mode of exchanges.
This type f radi exchange all ws t send a request, then t await a resp nse f the rem te equipment.
Note : the commands of Point-to-point exchanges, have the following format: (all the exchanges
modes are treated in document [DR1])
CMD NAME DESCRIPTION
0x20 REQ_SEND_FRAME Request to send a radio frame with the waiting for the radio response.
0x30 RECEIVED_FRAME Received radi frame by the radi b ard.
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The data field of each command must be formatted according to the following table :
CMD DATA
6 bytes variable ( max : 152 bytes)
0x20 Radio address from equipment to reach Data to transmit
0x30 Radio address from transmitter
equipment Recei ed Data
the first byte f the field 'data t transmit' ( r 'Received Data') c ntains an applicative c mmand ( r its
ackn wledgement). That all ws t the recept r f the frame t identify the type f requests ( r f resp nses).
Data to Transmit or Recei ed Data
1 byte 151 bytes
REQ_SEND_FRAME Applicative command Data relating to the request
RECEIVED_FRAME Acknowledgement o the
applicative command Data relating to the response
The c mmands set is available in Appendix A.
ATTENTION, This document describes only the format of the fields 'Data to Transmit', 'Received Data'.
These fields are directly dependent on the access to the functionalities of the WaveTherm modules. The
other fields of the radio frame depend on the exchanges modes chosen, and are detailed in document
[DR1].
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5 INFORMATION RELATIVE TO THE PROBE A OCIATED WITH THE
WAVETHERM MODULE
5.1 DALLAS Probes
5.1.1 Coding of temperatures for the DALLAS probe type DS18B20
These pr bes have a res luti n f 12 bits and their value is c ded n tw bytes (MSB first)
Negative values are expressed in tw 's c mplements with additi n f a sign.
MSB LSB MSB LSB
M st Significant Byte Leasr Significant Byte
b7 b6 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0
SSSS27262524232221202-1 2-2 2-3 2-4
Unit : Celsius degree (°C)
Bits [b7:b3] : sign bit.
Remark: The hexadecimal value 0x4FFF indicates the absence of a probe, or a connection error between
the module and the probe.
S me temperature values:
Temperature Binary value (M B First) Hexadecimal value
+125°C 0000 0111 1101 0000 0x07D0
+85°C 0000 0101 0101 0000 0x0550
+25°C 0000 0001 1001 0000 0x0190
0°C 0000 0000 0000 0000 0x0000
-10.125°C 1111 1111 0101 1110 0xFF5E
-55°C 1111 1100 1001 0000 0xFC90
5.1.2 Probe ID
The pr be ID c rresp nds t a unique c de attributed t each DALLAS temperature pr be in the fact ry.
This c de is c mp sed f 8 bytes defined as f ll ws:
MSByte LSByte
1 byte 6 bytes 1 byte
Family C de Serial n° (48 bits) CRC C de
The family code is used to distinguish between the probes used:
Probe DS18S20 : 0x10
Probe DS18B20 : 0x28
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5.1.3 Setting of the probe coefficient parameters
The precisi n f DALLAS pr bes is indicated by the manufacturer as ±0.5°C (-10°C t +85°C) and requires
n calibrati n bef re use.
H wever, it is p ssible t impr ve this precisi n if the user wishes t calibrate the pr be. In this case, the
WaveTherm m dule c ntains a 32-byte mem ry z ne f r st rage f transfer c efficients after calibrati n.
Initially, tw parameters was created (size: 2 bytes per parameter), each ne being able t st re the value f
a c efficient f transfer.
After calibrati n, this all wed t refine measurement with a 2 degrees p lyn mial t the maximum.
Thereafter, a m re imp rtant mem ry area was implemented, in rder t st re user data. Users can use this
area f r whatever they want, but in rder t increase the measurement precisi n, this 32-bytes area all ws t
st re a m re significant number f c efficients.
C nsequently the p lyn mial used can be superi r degrees t 2; and all ws t btain a finer sleeking f
inf rmati n. Management f this mem ry area is described further in chapter 7.1.5.
Remark : To maintain compatibility with old versions of the modules (Is)Thermeter), the storage
parameters of the coefficients are always existing, and are accessible by commands of reading and
writing of internal parameters.
Parameter 0x25 : parameter A relating to sensor 1
Parameter 0x26 : parameter B relating to sensor 1
Parameter 0x27 : parameter A relating to sensor 2
Parameter 0x28 : parameter B relating to sensor 2
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5.2 PT100 and PT1000 probes
5.2.1 Representation of temperature values
Due t the high level f precisi n required f the temperature values pr cessed by the m dule,
WaveTherm PT100 r PT1000 are true numbers (with a mantissa and exp nent).
They are represented in the f rm f a 32-bit fl ating number.
The f rmat used is the standard IEEE f rmat with precisi n c ded n 32 bits (+/-5.8774e-39 t
+/- 170,14e36)
➢The retic representati n f a fl ating IEEE 32-bit in bytes :
➢Representati n f the fl ating numbers in the radi buffer:
The radi m dule represents the 32-bit fl ating data in its buffers by c ding them in LSB first. This is the
standard representati n f rmat used by the c mpilers C/C++ n PC.
A shift f the exp nent all w t c de it fr m E-127 t E+128
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5.2.2 Calibration of radio module
➢Factory calibration
The precisi n f PT100 and PT1000 pr bes is such that the WaveTherm m dule measurement chain
requires calibrati n.
This calibrati n is carried ut aut matically in the fact ry and the pr duct is supplied ready f r use.
➢Re-calibration on site
Re-calibrati n n site is p ssible under certain c nditi ns.
T carry ut this perati n, it will be necessary t c nnect tw calibrati n precisi n resistances.
Remark: Calibration is therefore only possible on WaveTherm PT100 (or PT1000) modules equipped with
two probe inputs.
The WaveTherm PT100 and PT1000 m dules p ssess tw m dule calibrati n parameters. These
parameters are accessible in read- nly and are updated with a calibrati n c mmand
They c ntain the internal reference resistance values used during temperature measurement.
Parameter 0x30 : value of the internal reference resistance very low
Parameter 0x31 : value of the internal reference resistance very high
Calibrati n is theref re carried ut using precisi n calibrati n resistances f r accurate measurement f the
internal reference resistances and st rage f the ass ciated results in internal parameters. These values are
then used during temperature measurement.
Remark : Calibration resistance value:
- for WaveTherm – PT100 : 60 and 160 ohms.
- for WaveTherm – PT1000 : 160 and 1600 ohms.
➢Associated radio commands
Applicati e Command Description
0x08 Request to calibrate the radio module
0x88 Response to the request to calibrate the radio module
c ntents f REQ_SEND_FRAME request
Data Field (max : 152 bytes)
Applicati e
Command
Value of the internal
reference resistance ery low
(float - LSB First)
Value of the internal reference
resistance ery high
(float - LSB First)
1 byte 4 bytes 4 bytes
0x08
The fields concerning the values of the internal reference resistors must be indicated with 32-bits
floating numbers ( LSbyte first). A more precise description of the 32-bits floating number format is
indicated in chapter 5.2.
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c ntents f RECEIVED_FRAME resp nse
Data Field (max : 152 bytes)
Acknowledgement
of the applicati e
command
Status de l'étalonnage
Reference resistance
A
(LSB First)
Reference resistance
B
(LSB First)
1 byte 1 byte 4 bytes 4 bytes
0x88 0x00 : calibration OK
0xFF : calibration error
Resistances A and B are rest red in the 32-bits fl ating numbers f rmat (LSB first). F rmat described in
chapter 5.2.
5.2.3 Setting of probe coefficient parameters
The PT100 and PT1000 pr bes have a c efficient pr viding a linear temperature resp nse.
Remark : The European standard EN60751 relative to probes defines 3 coefficients A,B and C used in
the calculation of the relationship : resistance = f (temperature).
In the -200 to 0°C range : R = R0[1+At + Bt2 + C(t – 100°C)t3)
in the -0°C to 850°C range: R = R0(1+At + Bt2 )
R0 : Resistance at 0°C
A, B and C: transfer coefficients
As the WaveTherm m dule perating m de c nsists f measuring the pr be resistance and then calculating
the temperature, it requires c efficients in rder t calculate the relati nship between these values:
temperature = f (resistance)
and not resistance = f (temperature).
The relati nship T = f(R) must theref re be calculated acc rding t the relati nship pr vided in standard
EN60751.
The f ll wing p lyn mial is used:
T = C7.R7 + C6.R6 + C5.R5 + C4.R4 + C3.R3 + C2.R2 + C1.R + C0
where C7, C6, C5, C4, C3, C2, C1, and C0 are the parameters to be transferred to the radio module
The c efficients t be transferred t the radi m dule are based n the c efficients A,B and C (given by the
manufacturer f the PT100 r PT1000 pr bes) in a mathematical f rmula. When required, CORONIS is able
t pr vide a utility enabling calculati n f these c efficients. There are 8 in t tal (c eff A t H).
They are managed with standard internal parameters read and write c mmands. (see chapter 6.2).
WaveTherm modules – application handbook page 19 of 65

File : CS-SUP-MUTI-WTHERMAPP-E01.sxw
All c efficients are regarded by the radi m dule as a single parameter.
Parameters Description
0x32 Coe icients o probe 1
0x33 Coe icients o probe 2
Each parameter is c mp sed f 8 c efficients f 32 bits (fl ating IEEE) with a t tal size f 32 bytes.
The c efficients are represented in the radi buffer during use f the parameter read/write c mmands as
f ll ws :
Remark: Coeff A : C0Coeff E : C4
Coeff B : C1Coeff F : C5
Coeff C : C2Coeff G : C6
Coeff D : C3Coeff H : C7
WaveTherm modules – application handbook page 20 of 65