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9. MODBUS Protocol and Instructions                                                                             

9.1 Communication Connection 

The transmitter’s RS-485 communication port features electronic isolation 

protection, lightning protection, and provides an isolated ground terminal. It is able 

to connect using standard twisted pair (segregated, double-stranded) cables. The 

positive connection point D+(B) of all devices are connected together with one 

strand of the double-stranded twisted-pair cable, and all the negative contacts D-(A) 

with the other strand; the isolated wire shield must be connected to the ground 

terminal (GND). In the laboratory, a standalone master-slave communication is 

relatively simple. Therefore, standard cables can be used. However, for industrial 

settings, strict engineering construction requirements must be taken into account for 

proper installation. The wiring diagram is as follows: 

Note:

 

1.

 

The transmitter’s RS-485 interface is equipped with a protective ground terminal. When 
communicating with the RS-485, the ground terminal must be used to eliminate safety risks. 

2.

 

Use 120 ohm impedance matching resistors at the signal cable terminals (D+(B) and D-(A)) of the 
terminal devices to effectively reduce or eliminate signal reflection. 

Note: Three common causes of connection failures: 

a.

 

Open circuits: the signal cable has an open circuit. 

b.

 

Short circuits: there is insufficient insulation between signal cables causing a short circuit. 

c.

 

Idle-bus: there is no data transmission in the Controlbus. 

The three conditions above can cause an unknown state of the Controlbus voltage, leading to the 
receiver receiving unexpected signals. Therefore, in complicated setups like multi-transmitter 
connections, the Controlbus requires a terminating resistor to avoid baud rate reflection, in addition 
to biasing circuits composed of pull-high and pull-low resistors, and voltage source (VBus). As seen 
in the diagram above, make sure the signal cable terminals D+(B) and D-(A) has free voltage in 
between to keep the signals complete. Some systems may not be suitable for a fixed resistor and VBus, 

V

Bus

 

GND 

︴

D+(B) 
GND  Master
D-(A)

 

TC-7310-RS-M

ID: 01

 

TC-7310-RS-M

ID: 02

 

Other 

Modbus 

equipment

 

.....

︴

︴

Depends on site 

conditions 

Pull-high 

resistor 

R

pull-high

 

Terminator 

R

T

 

Pull-low 

 resistor

      R

pull-

low 

46

Summary of Contents for TC-7310-RS-M

Page 1: ...1 TC 7310 RS M Intelligent MLSS Transmitter Operation Manual ...

Page 2: ...g to power supply Meter installation site should be properly ventilated and kept from direct sunlight and high temperature The signal cable requires a special coaxial cable material Cables provided by Suntex are strongly recommended Please do not use normal electric wires Prevent power surge interference to the transmitter Especially when using a three phase power system make sure the device is pr...

Page 3: ...l Connection Illustration 9 4 Configuration 4 1 Front Panel Illustration 10 4 2 Keypad 10 4 3 LED Indicators 10 5 Operation 5 1 Measurement Mode 11 5 2 Setup Menu 11 5 3 Calibration Menu 11 5 4 Shortcuts 11 5 5 Default Values 11 5 5 1 Settings Default Values 11 5 5 2 Calibration Default Values 12 6 Measurement Display Mode 6 1 Text Mode 13 6 2 Real Time Chart Mode 14 6 3 Trace Mode 15 6 4 Warning ...

Page 4: ...7 7 18 Automatic Return Return 38 8 Calibration Calibration Block Diagram 39 8 1 Calibration Setup Menu 40 8 2 Calibration Security Code Code 41 8 3 Calibration 42 8 3 1 Known Solution Calibration 42 8 4 Correction Factor 44 8 5 Automatic Return Return 45 9 MODBUS Protocol and Instructions 9 1 Communication Connection 46 9 2 MODBUS Name and Address Table 48 9 3 MODBUS Example Description 52 10 Err...

Page 5: ...it Confirm and proceed to next step Setup Items Function Icon Description Mode Measurement mode 1 Select from MLSS Digested Sludge Activated Sludge or or Defined table mode 2 Select display mode from text real time or trace mode 3 Measuring unit selection MLSS ppm or mg l Digested Sludge mg l Activated Sludge mg l Defined ppm or mg l Product Adj Product Adjustment Modify the measuring value attain...

Page 6: ...k Time and date settings RS 485 RS485 serial interface Modbus protocol Digital Filter Take 1 60 serial measurements average continuously and display as the reading following stabilization Black light Backlight settings set Auto ON OFF backlight brightness and sensitivity Contrast Screen contrast settings Logbook Event recorder logbook 50 data Return Measurement mode return settings Code Setup mode...

Page 7: ...n Left or left page Increase digit Right or right page Decrease digit Confirm and proceed to next step Calibration Items Up to Five Point Calibration Function Icon Description Known Sol Calibration by known value solution Correction Calibration by factor correction Code Calibration mode security code Return Measurement mode return settings Note Due to the need for continuous improvement of the tra...

Page 8: ...t Text mode Numerical display Chart mode 3 min real time dynamic graph Trace mode Programmable 3 min to 4 week trend graph Analog Output Isolated DC 0 4 20 mA corresponding to main measurement Max load 500 Serial Interface Isolated RS 485 MODBUS RTU or ASCII Logbook 50 events Settings Contact RELAY contact 240 VAC 0 5 A Max recommended Activate Hi Lo Hi Hi Lo Lo selectable two limited programmable...

Page 9: ...hole of 138 mm x 138 mm on the panel box and then insert the controller directly into the hole Insert the accessorial mounting bracket from the rear and fix into the pickup groove 2 2 Panel Mounting Illustration 138 mm 138 mm Hole size Minimum 200mm Hole distances on the panel box Mounting bracket Panel mounting illustration fix with mounting brackets 90 mm Minimum 200mm 5 ...

Page 10: ... fix with a U shaped pipe clamp optional Order Number 8 34 Sun Shield pipe mounting optional Order No 8 35 8 35 1 Sun Shield wall mounting optional Order No 8 35 8 35 2 Insert rubber plug into unused cable glands Tighten up the cable gland to prevent water vapor infiltration 6 ...

Page 11: ...3 Overview of MLSS Transmitter TC 7310 RS M 3 1 Rear Panel Illustration 3 2 Terminal Function Illustration POWER WASH Cln REL2 REL1 AC INPUT POWER 4 20mA RS 485 D B G D A S Cal S V V Check Shield 7 ...

Page 12: ... MLSS current output terminal for an external recorder or PLC control １３ 4 20mA terminal MLSS current output terminal for an external recorder or PLC control １４ Shield Sensor signal shield wire １５ V BROWN sensor wire power terminal １６ Check GREEN sensor wire self test signal output terminal １７ V BLUE sensor wire power terminal １８ S BLACK sensor wire signal terminal １９ Cal RED sensor wire calibrati...

Page 13: ...nal relay Surge absorber External relay Cleaning device Surge absorber M Dose feeder Surge absorber M Dose feeder Surge absorber M Note The transmitter s built in miniature relays are required to be repaired and replaced by professional technicians External relays Power Relay must be connected to activate external devices to protect the instrument 9 ...

Page 14: ...o move left or return to the previous page 2 When adjusting values press this key to increase the value 1 In the parameter set up mode and calibration mode press this key to move right or advance to the next page 2 When adjusting values press this key to decrease the value Key for confirmation press this key to confirm data values or select parameter item settings 4 3 LED Indicators WASH Washing d...

Page 15: ...nt mode 5 4 Shortcuts 1 Under measurement mode press and hold for 2 seconds to enter Logbook function Press to return to measurement mode 2 Under measurement mode press and hold for 2 seconds to switch from display mode to text mode trace mode or real time chart display mode 5 5 Default Values 5 5 1 Settings Default Values Sensor model TS MxS A Matrix table MLSS Measuring unit mg l Product adjustm...

Page 16: ...1 0000 Auto return Auto 3 minutes Code settings OFF Note The factory default calibration setting is No Cal and the calibration value is None This means that the user has not yet calibrated the sensor with the transmitter After every calibration the calibration information display will be updated 12 ...

Page 17: ...he main measurement screen and shows the measurement value and unit temperature compensation mode temperature measurement and unit time and date as seen in the following illustration Main measurement unit Main measurement Time and date Matrix table type 13 ...

Page 18: ...e updated after returning to measurement mode When the measured value exceeds a set range of the upper and lower limit the graphics will be presented in the upper and lower limits dotted line Real time chart mode display is shown as below There are also real time measurement value unit and temperature value unit which are displayed in the bottom of the screen The timeline in real time graphic is d...

Page 19: ... mark representing T 12 and five data sets between each mark The user can set the MLSS graph range under Mode in Settings see section 7 4 The smaller the range the greater the display resolution Trace mode shows the real time measurement value and unit and temperature value and unit at the bottom of the screen as seen in the following illustration Attention If the time interval is reset the trend ...

Page 20: ...2 Lo and the RELAY1 RELAY2 indicator LED will light up 4 When the Analog current output exceeds the upper lower limitation the display will flash mg l mA__ mg l mA or ppm mA ppm mA Note The HOLD warning text appears when clean function is activated or when in setup menu or in calibration menu Under HOLD status the corresponding display and output are as follows 1 Both Relay 1 and Relay 2 will ceas...

Page 21: ...7 Settings Settings Block Diagram Part 1 17 ...

Page 22: ...Settings Block Diagram Part 2 18 ...

Page 23: ...ment mode press the two keys and simultaneously to enter the current settings overview Press to enter setup mode to modify the settings if necessary Measurement Mode Setup Menu Press Press or Press Press or Press to confirm it 19 ...

Page 24: ...ss to confirm it When an incorrect passcode is entered the display will show Error Code press to re enter or press to exit The first 0 of digits 0000 will start to flash Press or to adjust the value and then press to confirm it and proceed to the next digit Select to turn on or turn off code protection function If turned on please input a new passcode The passcode will be required when you re ente...

Page 25: ...up mode select Language and press to enter system language selection Select from English Traditional Chinese or Simplified Chinese Enter Mode Unit Setup Press to confirm it Press to confirm it Press or to switch Press or to switch 21 ...

Page 26: ...atrix curve mg l Digested Sludge Matrix Built in digested TSS and SiO2 matrix curve mg l Defined Table Manually defined table and curve mg l or ppm Note Activated Sludge and Digested Sludges Matrix are only applicable to munincipal water measurements see Appendix Table 1 2 Configuration Complete Defined Table Measurement Display Settings continued on next page Press to confirm it Press to confirm ...

Page 27: ...Press or to select display mode Press or to select display mode Press or to adjust minimum value Press to confirm it Press to confirm it Press to confirm it Press to confirm it Press or _ to adjust seconds value then press to confirm and proceed to adjust minutes value Select NO to keep previously recorded data Press to confirm it 23 ...

Page 28: ... each reference point as needed however points within the table must be arranged in ascending or descending order Defined table must be selected under Mode Unit in setup mode Press or to select Defined press to confirm it Reference Point Corresponding Transferred Value Press or to select Set Point MLSS Unit or Trans Unit Press_____ to modify the selection Select Setting Table and press to proceed ...

Page 29: ...rieving the sensor for calibration A PDT icon will display on the main screen above the measurement unit if the product is adjusted see section 6 4 Enter Relay 1 Setup Press to confirm it Users may compare the measurement reading with the reference value Press or to tune the adjustment value in the main display in order to modify the reading of measurement which will show in the bottom part of dis...

Page 30: ...s or to adjust Setting Point SP value Press or to select to activate Relay 1 If turned off the menu will proceed to setup of Relay 2 Press to confirm it Press to confirm it Press or to select Relay 1 as Hi point or Lo point alarm Press to confirm it Press or to adjust Hysteresis Hys value Press to confirm it Press to confirm it Press or to select to activate testing of Relay 1 If turned on Relay 1...

Page 31: ...l Enter Wiper Setup Press or to select whether to turn on Relay 2 or not If OFF the guide menu will go to setup of Wiper Press to confirm it Press to confirm it Press or to select Hi point or Lo point alarm of Relay 2 Press to confirm it Press or to adjust Hysteresis Hys value Press to confirm it Press to confirm it Low Point Alarm Control off SP Hys MLSS t sec off on on Press or to adjust Setting...

Page 32: ...matic wiper cleaning every 10 minutes Select Manual to configure automatic cleaning interval between 2 to 9 minutes Adjust cleaning frequency as needed to suit application requirement Enter Electrode Zero Setup Press to confirm it Press or to select Wiper mode Press to confirm it Press or to adjust wiper cleaning interval Press to confirm it 28 ...

Page 33: ...or deionized water for zero point calibration Note When performing zero point calibration factory default electrode output signals will be altered The transmitter will display the 2mA current sent from the electrode signaling that zero point calibration is being done internally Enter Clean Setup Press to confirm it Select YES and press Select NO to exit zero point calibration and press The transmi...

Page 34: ...ion menu while the clean function is activated the instrument will automatically stop the cleaning action Press or to select to activate cleaning test If turn ON the Clean function will begin and the WASH indicator will light up Press to confirm it Press to confirm it Press to confirm it Press or to select to activate cleaning If turned off the menu will proceed to setup of Analog on off on off on...

Page 35: ...e used as a basis for failure determination Under HOLD measurement status the current output maintains the last output value before HOLD status However for the convenience of ensuring the current settings of an external recorder or of a PLC controller the current output will be 0 4 mA or 20 mA under the analog output setup menu Press to confirm it Press to confirm it Press to confirm it Press or t...

Page 36: ... If it cannot which mean the battery fails please replace the 3V CR2025 Li battery inside the transmitter Enter RS 485 Communication Setup Press to confirm it Press or to set the hour part and press to move to the minute part and adjust it afterwards Press or to set the month part and press to move to the date part and adjust it afterwards Press or to set the year Press to confirm it Press to conf...

Page 37: ...maintains the last output value before hold status Press or to select RTU or ASCII mode Enter Digital Filter Setup Press or to set the ID number of the transmitter The valid value is from 1 to 247 Press or to select stop bit as 1 bit or 2 bit Press to confirm it Press to confirm it Press to confirm it Press to confirm it Press to confirm it Press to confirm it Press or to select baud rate from 240...

Page 38: ... to be averaged for each reading to increase the stability of the displayed measurement The greater the number the more stable the measurement value the smaller the number the more acute the measurement value Enter Back Light Setup Press to confirm it Press to confirm it Press or to set the number of samples to be averaged 34 ...

Page 39: ...e backlight is off When a button is pressed it will enter touch on status Auto setting Transmitter will activate or deactivate the backlight according to the ambient lighting When a button is pressed it will enter touch on status Press to confirm it Press or to select backlight mode Enter Contrast Setup Press or to select five backlight brightness levels from 2 1 0 1 2 Press or to select backlight...

Page 40: ...ter setup of display contrast You can set the contrast of display according to your needs 2 1 0 1 2 light to dark Enter Logbook Setup Press to confirm it Press to confirm it Press or to select display contrast level 36 ...

Page 41: ...events and error diagnosis records The user can read important events by either by Logbook or Modbus For detailed definitions of events please see to section 9 2 Modbus Address and Command Table Press or to select different page Press to confirm it Enter Auto Return Setup Press to confirm it 37 ...

Page 42: ... it needs to exit setup menu manually while Auto means that the display automatically exits the setup menu and returns to measurement mode after a period of time without pressing any keys Press or to adjust minutes press to confirm it and proceed to seconds Press or to select Auto return or manual exit Enter Code Setup Press to confirm it Press to confirm it Press to confirm it Press to confirm it...

Page 43: ... First Cal Point Select First Buffer Range Second Second Buffer Range Return to previous level or action or finish calibration Correction Factor MLSS Activated Sludge Digested Sludge Defined Display Current from Sensor Adjust Second Cal Point Display Current from Sensor Press CAL Auto Display Cal Result Select Fifth Buffer Range Adjust Fifth Cal Point Display Current from Sensor Press CAL Select M...

Page 44: ...nt system press to return to measurement mode If you need to re calibrate the system press to enter calibration setup menu If the calibration time shows OFF it represents that the clock function has been turned off Press to go back to measurement mode Measurement mode Calibration Menu Press and simultaneously Press Press to confirm it Press to confirm it 40 ...

Page 45: ...or press to exit the calibration menu The first 0 of digits 0000 will start to flash Press or to adjust the value then press to confirm it and proceed to the next digit Select to turn on or turn off code protection function If turned on please input a new code A code will be required when you re enter setup mode Input the correct pass cod to enter calibration setup menu Input new code Press or Pre...

Page 46: ...sily obtainable The transmitter uses turbidity standard solution to for MLSS calibration and corrects the measured value according to a correction factor 8 3 1 Known Solution Calibration 8 3 1 1 MLSS Calibration During calibration select MLSS unit from mg l or ppm or select Turbidity units from NTU FTU or FNU MLSS and Turbidity calibration provides each 5 preset standard solution values for select...

Page 47: ...multi point calibration Press or to select the second point closest to the known solution value Press to complete single point calibration Press or to adjust the MLSS standard solution value Rinse the sensor with distilled water and place into the second solution for measurement Press to directly display the result or wait for the transmitter to automatically confirm it Press to confirm it Press t...

Page 48: ...see section 7 4 Measurement Mode Unit then select calibration unit mg L or ppm 8 4 Correction Factor Acorrection factor needs to be applied when calibrating for MLSS using turbidity standard solutions to correct measured MLSS values Under MLSS Table calibration mode select the appropriate turbidity unit NTU FTU or FNU and calibrate to known standard solutions then proceed to correction factor adju...

Page 49: ...uto sets the display to automatically exit calibration mode and return to measurement mode after a set time of user inactivity Note The return function of setup menu and calibration setup menu are independent settings Enter Calibration Menu Code Setup Press to confirm it Press or to select Auto return or manual exit Press to confirm it Press or to adjust minute part and press to confirm it and mov...

Page 50: ... safety risks 2 Use 120 ohm impedance matching resistors at the signal cable terminals D B and D A of the terminal devices to effectively reduce or eliminate signal reflection Note Three common causes of connection failures a Open circuits the signal cable has an open circuit b Short circuits there is insufficient insulation between signal cables causing a short circuit c Idle bus there is no data...

Page 51: ...distance transmission it is recommended to use cables that are specifically design for RS 485 4 When communicating all equipment within the network should be consistently kept in the same transfer mode baud rate and parity All devices must be under different addresses to prevent conflicts within the network communications 5 The transmitter s Modbus command can only access 50 registers Abnormal inf...

Page 52: ...s Information Type Description of Data Transmission Default Value Note 0000H None 0001H R Equipment s ID 2 USHORT 1 247 1 0002H R Transmitter Model 6 USHORT ASCII Code TC7310 0005H R Communication Protocol 2 USHORT 0 RTU 0 1 ASCII 0006H R Serial Transmission Speed Baud Rate 2 USHORT 0 2400 3 1 4800 2 9600 3 19200 0007H R Parity 2 USHORT 0 None 1 1 Even 2 Odd 0008H R W Real Time Clock 12 USHORT Sec...

Page 53: ...HORT 0 AUTO 2 1 ON 2 OFF 0022H 2 SHORT 2 Highest Brightness 0 SHORT 1 High Brightness SHORT 0 Standard SHORT 1 Low Brightness SHORT 2 Lowest Brightness 0023H R W Backlight Sensitivity 2 SHORT 2 Highest Sensitivity 0 SHORT 1 High Sensitivity SHORT 0 Standard SHORT 1 Low Sensitivity SHORT 2 Lowest Sensitivity 0024H R W Sample average of measurements 2 USHORT 1 60 5 0025H R W Product Adjustment 4 FLO...

Page 54: ...41 C8 00 00 The transmission order will be 00 00 41 C8 For detailed description please refer to section 9 3 Modbus example description Note 3 USHORT represents unsigned short integer Note 4 Event Logbook ID If the user requires Modbus to retrieve information from the logbook 0028H must be input first before reading 0029H 002F corresponding event Logbook ID 1 represents the newest recorded event ID...

Page 55: ...050H Factory reserved Function Code 01H Modbus response dispersion parameter Logic address Item BIT Description Default value Note 0070H LO Alarm 1 Contact on 0 Contact off 0071H Hi Alarm 1 Contact on 0 Contact off 0072H MA too high 1 Contact on 0 Contact off 0073H MA too low 1 Contact on 0 Contact off 0074H Factory reserved 0075H Exceed MLSS range 1 Contact on 0 Contact off 0076H RLY1 Action 1 Co...

Page 56: ... of Registers Hi 00 Register value Lo 00 No of Registers Lo 02 Register value Hi 41 LRC C5 Register value Lo C8 LRC 56 RTU Mode Request Response Message Framing Hex Message Framing Hex ID Address 01 ID Address 01 Function code 03 Function code 03 Starting Address Hi 00 Byte Count 04 Starting Address Lo 35 Register value Hi 00 No of Registers Hi 00 Register value Lo 00 No of Registers Lo 02 Registe...

Page 57: ... new standard solution 2 Maintain or replace electrode and make another calibration Error5 Incorrect passcode ERROR CODE Re enter passcode Error6 No sensor connection or sensor failure 1 Please check if the sensor is connected to the instrument 2 Maintain the electrode or replace a new electrode and make another calibration Error9 Serious error that does not permit any further measurements Please ...

Page 58: ...ed solids mg l Activated sludge value 6210 8800 11620 15550 17570 Table 2 Digested Sludge TSS SiO2 II SiO2 mg l 320 1130 1730 3190 4280 Total suspended solids mg l Digested sludge value 410 1480 2370 5260 9970 SiO2 mg l 5000 5600 6260 7160 7620 Total suspended solids mg l Digested sludge value 14900 20700 32000 59400 100000 Note Above two matrix tables are only applicable for municipal wastewater ...

Page 59: ......

Page 60: ...ane 169 Kangning St Xizhi Dist New Taipei City Taiwan R O C Tel 886 2 2695 9688 Fax 886 2 2695 9693 e mail suntex ms1 hinet net www suntex com tw en 5040E TC 7310 RS M Technical data subject to alternations Quality Systems ISO 9001 201711 ...

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