Turtle Tough 6000 Series User manual

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turtletoughsensors.com
MANUAL
6000 SERIES DIGITAL SMART ANALYSERS
Conducvity TDS Resisvity/Salinity

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Introduction
Congratulaons on purchasing a Turtle Tough 6000 Series Digital Smart Analyser. This analyser has been
specically developed to achieve opmum performance from your Turtle Tough Sensor.
This instrucon manual provides informaon for the correct installaon and use of a Turtle Tough 6000 Series
Digital Smart Analyser, to ensure you get the maximum life and performance from your sensor. Any use other
than the one described here compromises the safety of persons and the enre measuring system and is, there-
fore, not permied. The manufacturer is not liable for damage caused by improper or non-designated use.

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Installation
As with all instrumentaon, the installaon and commissioning of this instrument are crucial to its
safe and eecve operaon. This instrument must only be used for its purpose as outlined in this
manual. It must be installed and commissioned by this manual and by trained, qualied personnel.
Site Selecon
Please choose a suitable locaon for the installaon of the electronics. The choice of installaon
point on any site is a compromise and is best undertaken by an experienced installaon engineer.
The following is a list of the factors that need to be taken into consideraon.
• Ensure that the mounng allows access to all serviceable parts.
• Try to mount the electronics in a posion where they are not habitually hosed down in a
cleaning process.
• The electronics enclosure should be mounted away from sources of heat or direct sunlight.
• Consider the length of wiring runs when mounng the instrument.
• Try to keep the electronics away from substaons, motors or other large EMI emiers.
• Consider whether the sample will be representave and well mixed.
• Consider sample line run mes.
• Consider sample return points.
• In a plasc run, with a low conducvity liquid sample, consider earthing the sample.
• If the instrument is controlling a dosing pump, size the pump appropriately.
Note: This list is not intended as a checklist neither is it implied that the list is complete.
Unpacking
• Please have a copy of your order with you when you unpack your instrument.
All orders are checked when they leave the factory.
• Please check that you have all the parts that were ordered as soon as you open the box.
• If anything is missing or damaged, please contact your sales outlet immediately.
• If the instrument needs to be returned for any reason please follow the return instrucons given
in this manual.
• Please dispose of the packing in an environmentally responsible manner and in compliance with
local regulaons.
Danger
Electric
Shock
Hazard
Important
Important

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Specifications
Product Name 6000 Series Samrt Digital Analyser
Conducvity 0~500mS/cm
Resoluon 0.1us/cm;0.01ms/cm
Intrinsic Error ±0.5%F.S
Resisvity 0~18.25MΩ/cm
Resoluon 0.01KΩ/cm;0.01MΩ/cm
TDS 0~250g/L
Resoluon 0.01mg/L;0.01g/L
Salinity 0~700ppt
Resoluon 0.01ppm;0.01ppt
Temperature -10 to 150 °C
Resoluon ±0.3 °C
Temperature Compensaon Automac or manual
Power Supply 2 Rd 4~20mA
Oponal Power Supply 85~265VAC,9~36VDC, Power: ≤3W
Communicaon Output Modbus RTU RS485
Other Funcon Data recording, curve display, data uploading
Relay Control Contact 3 Groups: 5A 240VAC,5A 28VDC or 120VAC
Environmental Temperature -10~60 °C
Relave Humidity No more than 90%
Protecon Grade IP65
Weight 1.5kg
Dimensions 144*144*118 mm
Mounng Hole Dimensions 138*138mm
Installaon Embedded, wall - mounted, pipe type

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Back fixed hole size Embedded mounting Cut-out size
138 mm +0.5 mm
138 mm +0.5 mm
M4x4
45x45 mm
144 mm 136 mm
144 mm
26 mm
118 mm
Installation
Dimensions

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Installation completion diagram
Installation completion diagram
Install fixing bracket for instrument
Insert into the cut-out hole
a. Install fixing bracket for instrument
b. Wall screw fixing
D+ D-
B2 LN
RELAY A RELAY B RELAY C
Install fixed bracket top view,
pay attention to
6x15 mm
150.3 mm
58.1 mm
Installation
Embedded Installaon
Wall Mounted Installaon

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Wiring Connection
V+,V-,A1,B1 Digital Input Channel 1 REF1 PH/Ion reference 1
V+,V-,A2,B2 Digital Input Channel 2 INPUT1 PH/Ion measure 1
I 1,G,I 2 Output current TEMP1 Temperature 1
A3,B3 RS485 communicaon output SEN-,SEN+ Membrane dissoluon of oxygen/FCL
G,TX,RX RS232 communicaon output
P+,P- VDC power supply REF2 PH/Ion reference2
INPUT 2 PH/Ion measure 2
T2+,T2- Temperature wiring TEMP2 Temperature 2
EC1,EC2,EC3,EC4 Conducvity/Resisvity wiring GND Grounding (for tesng)
RLY3, RLY2, RLY1 Group 3 relays CE,RE,WE Constant voltage for FCL/CLO2/O3
L,N, L re wire, N neutral wire, geodesic
Connecon Between Equipment And Sensor
The power supply of relay, output signal, alarm contact and connecon between sensor and instrument are all
inside the instrument. Wiring is done according to Figure 3. The lead length of the cable xed by the electrode
is generally 5-10 meters. Insert the line with corresponding label or color on the sensor into the corresponding
wiring terminal inside the instrument and ghten it.
5

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Navigation
Keypad Operaon
Short Press: Release the key immediately aer pressing. ((Default to short presses if not indicated below)
Long Press: Press the buon for 3 seconds and then release it.
Press & Hold: Press the buon and accelerate aer a certain me unl the data is adjusted to the required
value before releasing the buon.
Enter menu setting mode
Return measurements
Two modes switching
Enter standard solution calibration mode
Calibrated: check the calibration status
Re-calibration: press “ENT” again
Return to
previous menu
Confirmation
options
Menu setting mode:
press this key to loop
down the menu options
Menu setting mode:
press this key to
rotate menu options
Press the key in
measurement mode to
display the trend chart

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Display
Before using please check all pipes and electrical connecons. Aer power supply, the analyser is shown as:
Measurement Mode
Calibraon Mode
Seng Mode
Trend Chart Display

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Menu Structure
Seng
Electrode Set
Electrode Type Seng
EC
TDS
Salinity
Resisvity
Unit Setup
us/cm, ms/cm
KΩ/cm, MΩ/cm
mg/L, g/L
ppm, ppt
%
Electrode Constant 1.0 (Default, can be modied)
Temperature Coecient 2.0 (Default, can be modied)
Temperature
Temperature Sensor
NTC2.252 kΩ
NTC10 kΩ
Pt100
Pt1000
Temperature Oset 0.0000
Temperature Input Automac
Manual
Temperature Unit °C
°F
Calibraon
Standard Soluon
Calibraon
Calibraon Number 1 0.01us/cm (Default, can be modied)
Calibraon Number 2 84us/cm (Default, can be modied)
Calibraon Number 3 1413us/cm (Default, can be modied)
Calibraon Number 4 12.88ms/cm (Default, can be modied)
Calibraon Number 5 111ms/cm (Default, can be modied)
Calibraon Correcon
Voltage 1
Voltage 2
Voltage 3
Voltage 4
Voltage 5
Field Calibraon
Field Calibraon
Oset Adjustment
Slope Adjustment
Alarm Set
Relay 1
On-O state ON
OFF
Specify the type
High Alarm
Low Alarm
Clean
Relay 2
On-O State ON
OFF
Specify the type
High Alarm
Low Alarm
Clean
Limit seng
(open me - cleaning state) Connuous opening me
Lag
(o me- in cleaning state)
(The interval between the last opening and
closing and the next opening)
Relay 3
On-O State ON
OFF
Specify the type
High Alarm
Low Alarm
Clean
Limit seng
(open me - cleaning state) Connuous opening me
Lag
(o me- in cleaning state)
(The interval between the last opening and
closing and the next opening)

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Output
Current 1
Channel Main
Temperature
Output Opon
4-20 mA
0-20 mA
20-4 mA
Upper Limit
Lower Limit
Current 2
Channel Main
Temperature
Output Opon
4-20 mA
0-20 mA
20-4 mA
Upper Limit
Lower Limit
RS485
Baud Rate
4800 BPS
9600 BPS
19200 BPS
Parity Check
None
Odd
Even
Stop Bit 1 Bit
2 Bit
Network Node 001 +
Data Log
Graphic Trend Chart
Interval/point
Display according to interval sengs
480 points/screen
1h/point
12h/point
24h/point
Data Query Query by Number of Data Year/Month/Day,Time:Minu:Secs Value Unit
Record Interval
7.5s
90s
180s
Memory Informaon 101600 point
Data Output
System
Language English
Date/Time Year-Month-Day
Hour-Minute-Second
Display
Display Speed
Low
Standard
Medium
High
Backlight Saving
Bright
Range Set
1
2
3
Automac
So Version
So Version 19-1.0
Password Sengs 0000
Serial Number
Factory Default No
Yes
Terminal Current Tuning
Current 1 4 mA (The posive and negave ends of the
ammeter are connected to the current 1 or
current 2 output terminals. Press [] key to
adjust the current to 4 mA or 20 mA ,press
[ENT]key to conrm.)
Current 1 20 mA
Current 2 4 mA
Current 2 20 mA
Relay Test
Relay 1 (Select 3 groups of relays and hear the
sound of two switches, the relay is normal.)
Relay 2
Relay 3

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Calibration
Press [MENU] to enter the seng mode and select the calibraon.
Calibraon
Standard Soluon Calibraon
Calibraon Point 1 Enter given standard liquid value (Example:0.01)
Calibraon Point 2 Enter given standard liquid value (Example:84us/cm)
Calibraon Point 3 Enter given standard liquid value (Example:1413us/cm)
Calibraon Point 4 Enter given standard liquid value (Example:84ms/cm)
Calibraon Point 5 Enter given standard liquid value (Example:111ms/cm)
Field Calibraon
Oset Adjustment
Linear Adjustment
Standard Soluon Calibraon
This funcon is used to calibrate the ve calibraon points of the sensor. It has been calibrated before delivery
and users can use it directly. If calibraon is required, prepare 5 suitable standard liquids with known value, press
[MENU] to enter the seng mode and select the calibraon point.Modify or enter the corresponding calibraon
value. Aer seng the calibraon value, press [MENU] key returns to the measurement screen, and press [CAL]
key to enter the standard soluon calibraon mode. Standard soluon calibraon has ve points, and can be
calibrated at any point (at least one point). If the instrument has been calibrated, press the [CAL] key to check
the calibraon state, press the [] key to switch the calibraon state of the calibraon point, and if the point
shall be re-calibrated, in this state, press [ENT] key to enter re-calibraon. If the monitor prompts you to enter
the calibraon safety password, press [] or [] key to set the calibraon safety password, then press [ENT] to
conrm the calibraon safety password.
Point 1 calibraon: Aer entering the calibraon mode, the instru-
ment displays as shown in the gure at the le. The main value of the
instrument displays the known standard liquid value of point 1. Place
the electrode into the standard soluon of the corresponding value,
and the corresponding voltage mV value and calibraon state will be
displayed on the le side of the screen. Aer compleon of calibraon,
[Done] will be displayed on the right side of the screen.If the next point
is calibrated, press [] to switch the calibraon point. If only one point
calibraon is needed, aer the calibraon is completed, press [MENU]
to exit. During the calibraon process, when the standard soluon is
wrong, the screen will show Error.
Field Calibraon
Select eld calibraon mode: [eld calibraon], [Oset adjustment], [linear adjustment].
[Field calibraon]
[Oset adjustment]
Compare the data from laboratory or portable instrument
with the measured data. If there is any error, the error
data can be modied by this funcon.
[Linear adjustment]
The linear value aer "eld calibraon" will be saved
in this item and the factory data is 1.00.

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Graphic Trend(Trend Chart)
Press [MENU] to enter the seng mode and set the record interval. The analyser will save the data according
to the selected record interval.
Data Log
Curve Query (Trend Chart)
Interval/Point 400 points per screen, Displays most recent data trend
1h/Point 400 points per screen. Data trend chart display of the last 16 days
12h/Point 400 points per screen. Data trend chart display of the last 200 days
24h/Point 400 points per screen. Data trend chart display of the last 400 days
Data Query year/month/day Year/month/day me: minute:second value unit
Interval
7.5s Store data every 7.5 seconds
90s Store data every 90 seconds
180s Store data every 180 seconds
Press the [MENU] key, back to the measurement screen, and press the [/TREND] buon in the measurement
mode to directly view the TREND chart of the saved data, 400 sets of data records per screen.
Under the current mode, press [ENT] key to display the le and right displacement data line (red), and long press
[ENT] key to accelerate the displacement.
When the boom icon is in green, it is the movement direcon of the [ENT] key.
Press [/TREND] to switch the displacement direcon, and press [/INFO] to switch the display range (enlarge/
shrink).

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Modbus RTU General Information
The hardware version number of this document is V2.0; the soware version number is V5.9 and above. This
document describes the Modbus RTU interface in details and the target object is a soware programmer.
Modbus Command Structure
Data format descripon in this document;
Binary display, sux B, for example: 10001B
- decimal display, without any prex or sux, for example: 256
Hexadecimal display, prex 0x, for example: 0x2A
ASCII character or ASCII string display, for example: "YL0114010022"
Command Structure
The Modbus applicaon protocol denes the Simple Protocol Data Unit (PDU), which is independent of the
underlying communicaon layer.
Figure 1: Modbus Protocol Data Unit
Modbus protocol mapping on a specic bus or network introduces addional elds of protocol data units. The
client that iniates the Modbus exchange creates the Modbus PDU, and then adds the domain to establish the
correct communicaon PDU.
Figure 2: Modbus architecture for serial communicaon
On the Modbus serial line, the address domain contains only the slave instrument address. Tips: The device
address range is 1...247
Set the device address of the slave in the address eld of the request frame sent by the host. When the slave in-
strument responds, it places its instrument address in the address area of the response frame so that the master
staon knows which slave is responding.
Funcon codes indicate the type of operaon performed by the server.
CRC domain is the result of the “ redundancy check” calculaon, which is executed according to the informaon
content.

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Modbus RTU Transmission Mode
When the instrument uses RTU (Remote Terminal Unit) mode for Modbus serial communicaon, each 8-bit
byte of informaon contains two 4-bit hexadecimal characters. The main advantages of this mode are greater
character density and beer data throughput than the ASCII mode with the same baud rate. Each message
must be transmied as a connuous string.
The format of each byte in RTU mode (11 bits)
• Coding system: 8-bit binary
• Each 8-bit byte in a message contains two 4-bit hexadecimal characters (0-9, A-F)
• Bits in each byte: 1 starng bit
• 8 data bits, the rst minimum valid bits without parity check bits
• 2 stop bits
• Baud rate: 9600 BPS
How characters are transmied serially
Each character or byte is sent in this order (from le to right) the least signicant bit (LSB)...
Maximum Signicant Bit (MSB)
Start Bit 12345 6 7 8 Stop Bit Stop Bit
Figure 3: RTU paern bit sequence
Check Domain Structure: Cyclic Redundancy Check (CRC16)
Structure descripon:
Slave Instrument Address Data CRC
1 Byte 1 Byte 0...252 Byte 2 Byte
CRC Low Byte CRC High Byte
Figure 4: RTU informaon structure
The maximum frame size of Modbus is 256 bytes
Modbus RTU Informaon Frame
In Modbus RTU mode, message frames are disnguished by idle intervals of at least 3.5 character mes, which
are called t3.5 in subsequent secons.
Start Address Funcon Code Data CRC Stop
>3.5 Bytes 8 8 Nx8 16 >3.5 Bytes
Figure 5: RTU message frame
The enre message frame must be sent in a connuous character stream.
When the pause me interval between two characters exceeds 1.5 characters, the informaon frame is con-
sidered incomplete and the receiver does not receive the informaon frame.
Figure 6: Frame data transmission

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Modbus RTU CRC Check
The RTU mode contains an error-detecon domain based on a cyclic redundancy check (CRC) algorithm that
performs on all message contents. The CRC domain checks the contents of the enre message and performs this
check regardless of whether the message has a random parity check. The CRC domain contains a 16-bit value
consisng of two 8-bit bytes. CRC16 check is adopted..Low bytes precede, high bytes precede.
Implementaon of Modbus RTU in Instrument
According to the ocial Modbus denion, the command starts with a 3.5 character interval triggering com-
mand, and the end of the command is also represented by a 3.5 character interval. The device address and
Modbus funcon code have 8 bits. The data string contains n*8 bits, and the data string contains the starng
address of the register and the number of read/write registers. CRC check is 16 bits.
Value Start Device Address Funcon Code Data Summary Check End
No Signal Bytes
During 3.5
Characters
1-247
1
Funcon codes
conforming to
Modbus
specicaon
Data conforming
to Modbus
specicaon
CRCL
No Signal Bytes
During 3.5
Characters
Byte 3.5 1 N 1 1 3.5
Figure 7: Modbus denion of data transmission
Instrument Modbus RTU Funcon Code
The instrument only uses two Modbus funcon codes:
• 0x03: Read-and-hold register
• 0x10: Write mulple registers
Modbus Funcon Code 0x03: Read-and-hold Register
This funcon code is used to read the connuous block content of the holding register of the remote device.
Request the PDU to specify the start register address and the number of registers. Address registers from zero.
Therefore, the addressing register 1-16 is 0-15. The register data in the response informaon is packaged in two
bytes per register. For each register, the rst byte contains high bits and the second byte contains low bits.
Request
Funcon Code 1 Byte 0x03
Start Address 2 Bytes 0x0000….0xf
Read Register Number 2 Bytes 1...125
Figure 8: Read-and-hold register request frame
Response
Funcon Code 1 Byte 0x03
Start Address 2 Bytes 0x0000….0xf
Read Register Number 2 Bytes 1...125
N = Register number
Figure 9: Read-and-hold register response frame

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The following illustrates the request frame and response frame with the read and hold register 108-110 as an
example. (The contents of register 108 are read-only, with two byte values of 0X022B, and the contents of
register 109-110 are 0X0000 and 0X0064)
Request Frame Response Frame
Number Systems (Hexadecimal) Funcon Code (Hexadecimal)
Funcon Code 0x03 Byte Count 0x03
Start Address (High Byte) 0x00 Register Value (High Bytes) (108) 0x06
Start Address (Low Byte) 0x6b Register Value (Low Bytes) (108) 0x02
Number Of Read Registers (High Bytes) 0x00 Register Value (High Bytes) (109) 0x02b
Number Of Read Registers (Low Bytes) 0x00 Register Value (Low Bytes) (109) 0x00
Register Value (High Bytes) (110) 0x00
Register Value (Low Bytes) (110) 0x00
Funcon Code 0x64
Figure 10: Examples of read and hold register request and response frames
Modbus Funcon Code 0x10: Write Mulple Registers
This funcon code is used to write connuous registers to remote devices (1... 123 registers) block that spec-
ies the value of the registers wrien in the request data frame. Data is packaged in two bytes per register.
Response frame return funcon code, start address and number of registers wrien.
Request
Funcon Code 1 Byte 0x10
Start Address 2 Bytes 0x0000….0xf
Number Of Input Registers 2 Bytes 0x0001....0x0078
Number Of Bytes 1 Byte N×2
Register Values N×2 bytes Value
N = Register number
Figure11:Write mulple register request frames
Response
Funcon Code 1 Byte 0x10
Start Address 2 Bytes 0x0000….0xf
Read Register Number 2 Bytes 1…123(0x7B)
N = Register number
Figure 12: write mulple register response frames
The request frame and response frame are illustrated below in two registers that write the values 0x000A and
0x0102 to the start address of 2.
Request Frame (Hexadecimal) Response Frame (Hexadecimal)
Number Systems 0x10 Number Systems 0x10
Funcon Code 0x00 Funcon Code 0x00
Start Address (High Byte) 0x01 Start Address (High Byte) 0x01
Start Address (Low Byte) 0x00 Start Address (Low Byte) 0x00
Input Register Number (Low Bytes) 0x02 Input Register Number (Low Bytes) 0x02
Input Register Number (Low Bytes) 0x04 Input Register Number (Low Bytes)
Number Of Bytes 0x00
Register Value (High Byte) 0x0a
Register Value (High Byte) 0x01
Register Value (High Byte) 0x02
Register Value (High Byte)
Figure 13: Examples of wring mulple register request and response frames

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Data Format In Instrument
Floang Point
Denion: Floang point, conforming to IEEE 754 (single precision)
Descripon Symbol Index Manssa SUM
Bit 31 30...23 22...0 22...0
Index Deviaon
Figure 14: Floang point single-precision denion (4 bytes, 2 Modbus registers)
Example: Compile Decimal 17.625 to Binary
• Step 1: Converng 17.625 in decimal form to a oang-point number in binary form, rst nding the binary
representaon of the integer part
17decimal= 16 + 1 = 1×2⁴ + 0 × 2³+0×2²+0×2¹+1×2⁰
The binary representaon of integer part 17 is 10001B
then the binary representaon of decimal part is obtained
0.625= 0.5 + 0.125 = 1×2⁻²+ 0×2⁻¹ + 1×2⁻³
The binary representaon of decimal part 0.625 is 0.101B.
So the binary oang point number of 17.625 in decimal form is 10001.101B
• Step 2: Shi to nd the exponent.
Move 10001.101B to the le unl there is only one decimal point, resulng in 1.0001101B, and
10001.101B = 1.0001101 B× 24 . So the exponenal part is 4, plus 127, it becomes 131, and its binary
representaon is 10000011B.
• Step 3: Calculate the tail number
Aer removing 1 before the decimal point of 1.0001101B, the nal number is 0001101B (because before
the decimal point must be 1, so IEEE spulates that only the decimal point behind can be recorded). For the
important explanaon of 23-bit manssa, the rst (i.e. hidden bit) is not compiled.
Hidden bits are bits on the le side of the separator, which are usually set to 1 and suppressed.
• Step 4: Symbol bit denion
The sign bit of posive number is 0, and the sign bit of negave number is 1, so the sign bit of 17.625 is 0.
• Step 5: Convert to oang point number
1 bit symbol + 8 bit index + 23-bit manssa
0 10000011 00011010000000000000000B (the hexadecimal system is shown as
0 x418d0000 )
Reference Code
1. If the compiler used by the user has a library funcon that implements this funcon, the library funcon can
be called directly, for example, using C language, then you can directly call the C library funcon memcpy to
obtain an integer representaon of the oang-point storage format in memory. For example: oat oatdata;
// converted oang point number void* outdata;
memcpy(outdata,&oatdata,4);
Suppose oatdata = 17.625
If it is a small-end storage mode, aer execung the above statement, the data stored in the address unit
outdata is 0x00.
address unit (outdata + 1) stores data as 0x00
address unit (outdata + 2) stores data as 0x8D
address unit (outdata + 3) stores data as 0x41

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If it is large-end storage mode, aer execung the above statement,
the data stored in outdata of address unit is 0x41
address unit (outdata + 1) stores data as 0x8D
address unit (outdata + 2) stores data as 0x00
address unit (outdata + 3) stores data as 0x00
2. If the compiler used by the user does not implement the library funcon of this funcon, the following func-
ons can be used to achieve this funcon:
void memcpy(void *dest,void *src,int n)
{
char *pd = (char *)dest; char *ps = (char *)src;
for(int i=0;i<n;i++) *pd++ = *ps++;
}
And then make a call to the above memcpy(outdata,&oatdata,4);
Example: Compile binary oang-point number 0100 0010 0111 1011 0110 0110 0110 0110B to decimal number
• Step 1: Divide the binary oang-point number 0100 0010 0111 1011 0110 0110 0110 0110B into sym-
bol, bit, exponenal bit and manssa bit.
0 10000100 11110110110011001100110B
1-bit sign + 8-bit index + 23-bit tail sign bit S: 0 denotes posive number
Index posion E：10000100B =1×2⁷+0×2⁶+0×2⁵+0×2⁴ + 0 × 2³+1×2²+0×2¹+0×2⁰
=128+0+0+0+0+4+0+0=132
Manssa bits M：11110110110011001100110B=8087142
• Step 2: Calculate the decimal number
D = (−1)×(1.0 + M/223)×2E−127
= (−1)0×(1.0 + 8087142/223)×2132−127
= 1×1.964062452316284×32
= 62.85
Reference Code
oat oatTOdecimal(long int byte0, long int byte1, long int byte2, long int byte3)
{
long int realbyte0,realbyte1,realbyte2,realbyte3; char S;
long int E,M;
oat D;realbyte0 = byte3; realbyte1 = byte2; realbyte2 = byte1; realbyte3 = byte0;
if((realbyte0&0x80)==0)
{
S = 0;//posive number
}
else
{
S = 1;//negave number
}
E = ((realbyte0<<1)|(realbyte1&0x80)>>7)-127;
M = ((realbyte1&0x7f) << 16) | (realbyte2<< 8)| realbyte3; D = pow(-1,S)*(1.0 + M/pow(2,23))* pow(2,E);
return D;

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Funcon descripon: parameters byte0, byte1, byte2, byte3 represent 4 bytes of binary oang point number (
the return value Converted the decimal number
For example, the user sends the command to get the temperature value and dissolved oxygen value to the probe.
The 4 bytes represenng the temperature value in the received response frame are 0x00, 0x00, 0x8d and
0x41. Then the user can get the decimal number of the corresponding temperature value through the following
statement.
Temperature = 17.625.
oat temperature = oatTOdecimal( 0x00, 0x00, 0x8d, 0x41)
Read Instrucon Mode
The communicaon protocol adopts Modbus RTU protocol. The content and address of the communicaon can
be changed according to the needs of customers.
The default conguraon is network address 01, baud rate 9600, even check, one stop bit, users can set their
own changes;
Funcon code 0x04: This funcon enables the host to obtain real-me measurements from slaves, which are
specied as single-precision oang-point type (i.e. occupying two consecuve register addresses), and to mark
the corresponding parameters with dierent register addresses. Communicaon address is as follows:
• 0000-0001: Main Measured Value
• 0002-0003: Temperature value
• 0004-0005: Main Voltage Value
• 0006-0007: Temperature and Voltage Value
Communicaon Examples
Examples of funcon code 04 instrucons:
Communicaon Address = 1, Main Value = 20.0, Temperature = 10.0, Main Voltage=100.0,
Temperature Voltage= 200.0
Host Send: 01 04 00 00 08 F1 CC
Slave Response: 01 04 10 00 00 41 A0 00 00 41 20 00 00 42 C8 00 00 43 48 81 E8
Note:
• [01] Represents the instrument communicaon address;
• [04] Represents funcon code 04;
• [10] represents 10H (16) byte data;
• [00 00 00 41 A0] = 20.0; / Main Measured Value
• [00 00 4120]= 10.0; // Temperature value
• [00 00 42 C8] = 100.0; / / Main measured voltage value
• [00 00 43 48] = 200.0; / / Temperature and Voltage Value
• [81 E8] represents CRC16 check code;