General Measure M02 User Manual
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General Measure M02 User Manual

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Model no.: M02
U s e r 's M a n u a l
M02-00150101
48011201231000
110609010008

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Questions and answers

Amit patel
May 11, 2025

I want to know how we do zero after weight if indicator is not so the zero

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1 comments:
Mr. Anderson
May 20, 2025

To reset the zero on the General Measure M02 indicator, you can use one of two methods:

1. Zero calibration with weights: Write in "1" to start zero calibration with weights.

2. Zero calibration without weights: Write the millivolt value at zero within the range of 0.02–12.000 mV (for a 3 mV/V load cell). This value should be the millivolt reading at zero load.

Both methods are used to calibrate the zero point of the indicator.

This answer is automatically generated

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Summary of Contents for General Measure M02

  • Page 1 Model no.: M02 U s e r ’s M a n u a l M02-00150101 48011201231000 110609010008...
  • Page 2 ©2015, Shenzhen General Measure Technology Stock Co., Ltd reserves all copyright. Without permission from Shenzhen General Measure Technology Stock Co., Ltd., Any corporations or person must not copy, spread, record or translate into other language by any forms. Our company reserved the right to update user’s manual without additional notice to customers by reason of update, so please visit our website or contact with our service person to get update information.

  • Page 3: Table Of Contents

    CONTENTS 1 General Description..................1 1.1 Functions and Characteristics ............1 1.2 Front Panel..................2 1.3 Technical Specifications..............3 1.3.1 Common.................3 1.3.2 Analog..................4 1.3.3 Digital..................4 2 Installation and Wiring...................5 2.1 Connection of Power Supply............5 2.2 Connection of Load Cell..............5 2.2.1 6-wired Connection.............. 6 2.3 I/O terminals..................
  • Page 4 3 Calibration.....................13 3.1 Instruction..................13 3.2 Flow Chart of Calibration............... 14 3.3 Millivolt Value Display..............20 3.4 Calibration with Weights..............20 3.5 Millivolt Calibration................20 3.6 Calibration Switch for Communication Interface......22 3.7 Explanation for Calibration Parameters........23 4 Working Parameters Setting..............25 4.1 Flow Chart of Working Parameters Setting.........25 4.2 Parameter Setting Method.............27 4.3 Descriptions of Operation Parameters........
  • Page 5 6.1 r-Cont....................37 6.2 r-SP1....................37 6.2.1 Parameters Code Chart............ 37 6.2.2 Error Code Explanation............. 40 6.2.3 Command................40 6.3 tt TOLEDO..................48 6.4 Cb920....................49 6.5 rECont....................50 6.6 rEREAD.................... 51 6.7 Modbus..................... 52 6.7.1 Modbus Communication Address........53 7 Password Input and Setting, Reset............60 7.1 Password Input................60 7.2 Password Setting................

  • Page 6: General Description

    M02 Digital Indicator 1 General Description M02 weighing indicator is specially designed for weight transmitting in industrial fields. This indicator has the features of small volume, plenty communicating commands, stable performance, easy operation and practicability. It can be widely applied to concrete and bitumen mixing equipment, metallurgy furnace and converter, chemical industry and feed, etc.

  • Page 7: Front Panel

    M02 Digital Indicator 1.2 Front Panel M02 Front panel Main Display:6 digits, for displaying weight and the information of parameters. Status Indicator Lamp:  ZERO: Light on when present weight is within 0±1/4d.  STAB: Light on when changes of weight values are within the range of motion detecting during motion detecting time.

  • Page 8: Technical Specifications

    M02 Digital Indicator : Zero/Esc, Used to exit from current operation or go previous. : Used to scroll optional values of parameter and to make flashing digit increase 1 while data inputting. : Function Selecting Key, To make flashing position move to the right digit when data inputting.

  • Page 9: Analog

    M02 Digital Indicator 1.3.2 Analog: Load cell power: DC5V 200mA（MAX） Input impedance: 10MΩ Zero steady range: 0.00～12mV(Load cell 3mV/V) Input sensitivity: 0.1uV/d Input range: 0.00～15mV(Load cell 3mV/V) Transfer mode: Sigma - Delta A/D conversion speed: 15, 30, 60, 120, 480, 960 times/sec Non-linearity: 0.01% F.S...

  • Page 10: Installation And Wiring

    Power supply connection 2.2 Connection of Load Cell M02 weighing indicator connects bridge type resistance strain gauge load cells by 6 wires or 4 wires as follows. When you use 4-wired load cells, you must bridge the SN+ with EX+ and bridge the SN- with EX-.

  • Page 11: 6-Wired Connection

    M02 Digital Indicator 6 wires SIG+ SIG- Shield 4 wires SIG+ SIG- Shield 2.2.1 6 wires connection Note: 1. As load cell output sensitive analog signal, please use shield cable to separate with other cables, especially AC power. 2. 4 wires connection is suitable for short distance and stable temperature or low precision field, otherwise use 6 wires connection.

  • Page 12: I/O Terminals

    M02 Digital Indicator 2.3 I/O terminals I/O tolerant definition as follows: Output Input OUT1 Stable Reset OUT2 Indicator input terminal connection: Indicator input terminal connection:...

  • Page 13: Optional Expansion Board Output

    M02 Digital Indicator 2.4 Optional Expansion Board Output M02 weighing indicator supports analog output, RS232 or RS485 as optional output function, please confirm it when place orders. 2.4.1 Analog Output (Optional) At normal displaying status, press to check the analog output.
  • Page 14 M02 Digital Indicator The definition of analog output: V+: voltage-output+, V-: voltage-output- I+: current-output +, I-: current-output - Analog output two types: 1) Voltage output: 0-5V/0-10V is optional . 2) Electric current output: 4-20mA/0-20mA/0-24mA is optional. 3) User-define function, users can define analog output type and output range.
  • Page 15 M02 Digital Indicator In this interface，the multimeter measured Current calibration interface should be 4.000mA. If not,press Measured 4.000mA If yes,press This interface current In this interface，the D/A,press to adjust the value, multimeter measured and the current value measured will vary accordingly.To adjust it when the should be 4.000mA.

  • Page 16: Serial Interface Rs485 Output

    M02 Digital Indicator This interface is the highest point calibration of analog output. In the interface of highest point calibration,press to enter into analog display value interface, the display will be 5 digits (initial value is 24000, means 24.000mA),press to input the value measured by the multimeter.

  • Page 17: Serial Interface Rs232 Output

    M02 Digital Indicator 2.4.3 Serial Interface RS232 output (Optional) RS232 serial interface connection:...

  • Page 18: Calibration

    3 Calibration 3.1 Instruction （1）Calibration procedure must be executed when a M02 indicator is put in use at the first time, the preset parameters may no longer meet the user’s needs, and any part of the weighing system was changed. Position of decimal point, minimum division, maximum capacity, zero, and gain can be set and confirmed through calibration.

  • Page 19: Flow Chart Of Calibration

    M02 Digital Indicator 3.2 Flow Chart of Calibration 1. Under this status, press (twice), indicator will display CAL, then Normal Status press to enter password input. 2. After password is input, the indicator will display CALON for one second, then go to next step.
  • Page 20 M02 Digital Indicator 4. Press to select a desired value for min. division among 1,2, 5,10,20 and 50, and then to save it and enter next step. Min. divistion If there’s no need to change the value, then press directly to enter next step.
  • Page 21 M02 Digital Indicator 7.Unloaded scale first, when STAB lamp is on, press to finish zero calibration. there’s need calibrate zero, Zero calibration press directly to enter gain calibration.
  • Page 22 M02 Digital Indicator 8. The process of gain calibration is as follows. If there’s no need to do gain calibration, press directly to enter serial ports calibration switch setting.
  • Page 23 M02 Digital Indicator 9. Press to enter setting interface, press to choose the switch position, press to set password。If don’t need to set switch position, then press to enter password setting. 10. See section 7.2 for reference to set password.
  • Page 24 M02 Digital Indicator 3.3 Millivolt Value Display This function is mainly used for system test, position-error test for weighing mechanism and linearity test for load cell. 1. System Test (1) If display data changes with loaded weight changes, it shows that connection of load cell is correct and weighing mechanism works well.

  • Page 25: Millivolt Value Display

    M02 Digital Indicator 3.4 Calibration with Weights During calibration with weight ，please record the zero millivolt value, gain millivolt value and the loaded weight value in the blank table below. If it is not convenient to load a weight to calibrate, these values can be used for calibration without weights.
  • Page 26 M02 Digital Indicator...
  • Page 27 M02 Digital Indicator...

  • Page 28: Calibration Switch For Communication Interface

    M02 Digital Indicator 3.6 Calibration Switch for Communication Interface When calibrate the transmitter through serial port( Rs、SP1 or Modbus), must set to “ON” status for the calibration switch for communication interface. 3.7 Explanation for Calibration Parameters Symbol Parameter Types Value of parameter...
  • Page 29 M02 Digital Indicator Log Table for Calibration Parameters Parameter Calibrated Value Date Remarks Decimal Point Min. Division Max. Capacity Load cell sensitivity Password...

  • Page 30: Working Parameters Setting

    M02 Digital Indicator 4 Working Parameters Setting 4.1 Flow Chart of Working Parameters Setting Normal Status If F4.1(Password Switch) is ON, you SET UP should input password first. F1.1 F1.7 1 .Use to select between the same level. Switch from...
  • Page 31 M02 Digital Indicator F2.1 F2.7 2 .Press to enter into sub-selection, press return back to previous menu. When it displays F2,press to enter into F2.1. F3.1 F3.2 F4.1...

  • Page 32: Parameter Setting Method

    M02 Digital Indicator 4.2 Parameter Setting Method M02 has 2 kinds of working parameters: Selection type and data type. For selection type parameters, press to choose. For data type parameter in parameter interface, press to choose digit position, pressto choose value.

  • Page 33: Descriptions Of Operation Parameters

    M02 Digital Indicator 4.3 Descriptions of Operation Parameters Code Default Description Null The first major term of working parameter. Switch for Auto-Zeroing when power-on, F1.1 OFF: disabled ON: enabled Zero-tracking Range（0～9d optional）. F1.2 This parameter is for automatic calibration, disabled when is set ”0”.
  • Page 34 M02 Digital Indicator Null The second major term of working parameter. F2.1 Scale no., indicator no. Baud rate of serial port:1200 / 2400 / 4800 / 9600 / F2.2 9600 19200 / 38400 / 57600 F2.3 Cb920 Serial ports communication mode: Modbus-RTU：MODBUS RTU mode;...
  • Page 35 M02 Digital Indicator MODBUS dual-byte register storage turn ， Hi Lo ： HiLo F2.5 High byte in the front, low byte at the back；Lo Hi：Low byte in the front, high byte at the back F2.6 nonE Cont mode automatic sending time interval tt(TOLEDOcontinuous mode)If send the checksum。...

  • Page 36: Set Point Parameters

    M02 Digital Indicator F3.4 20000 Maximum capacity output F3.5 20020 Maximum output Null The fourth major term of working parameter. F4.1 Parameters password setting switch. F4.2 000000 Parameters password setting:Valid when F4.1 is ON 4.4 Set point parameters Code Default...
  • Page 37 M02 Digital Indicator 6：!=；compare to minimum value 7：_<>_outside the range, need to set 2 edge value 8：=<__>=inside the range, need to set 2 edge value 9：external trigger. If it’s IO，do 1 state change for 1 trigger, if it’s command, then decide according to valid or invalid command.

  • Page 38: O Definition

    M02 Digital Indicator 5 I/O Definition 5.1 I/O Definition Output/Input code table: Output Code Definition Description None No definition Stable Effective output in stable status. Overflow Effective output when overflow. Effective output when set point 1 status output. Effective output when set point 2 status output.
  • Page 39 M02 Digital Indicator Input Code Definition Description None No definition Zeroing Effective input for zeroing, pulse input signals If this signal is valid, Sp1 status will be regarded as invalid. Output valid state when comparision condition turns to invalid, and be effective again.

  • Page 40: I/O Testing

    M02 Digital Indicator Reset all Reset all paramater value when this signal is valid. 5.2 I/O testing Under weighing status,press (5 times)，then display TESTio，press enter into I/O testing interface. Normal Status Press OUT1 status flash, press OUT2 status flash. This interface shows:IN1 input valid, OUT1 output valid.

  • Page 41: Serial Communication

    M02 Digital Indicator 6 Serial Communication M02 has RS232 or RS485 as optional to realize communication with upper computer。Support r-Cont、r-SP1、Modbus(bus)、tt TOLEDO、Cb920、rECont protocols and rErEAD protocol. Serial communication terminal please refer to chapter 2.4.2、2.4.3. Baud rate and communication format setting please refer to F2.2、F2.3 and F2.4.

  • Page 42: R-Sp1

    M02 Digital Indicator G./N. Zero Null Null Stable weight point 0： 0： 0：not 0：+ non/zero normal stable 1：- 1：zero 1：OFL 1：stable Weight Value —— 6 bits；when weight is+（-）overflow,return to“space space OFL space” —— 2 bits,check sum —— 1 bit，0DH —— 1 bit，0AH...
  • Page 43 M02 Digital Indicator and weight Read set point status Write mini. Divistion and max. capacity Decimal point digit Minimum division Maximum capacity Auto. Zeroing switch Zero tracking range Stable range Zeroing range digital filtering para. steady filtering AD sample rate...
  • Page 44 M02 Digital Indicator 7: D6D5D4D3D2D1D0; Absolute millivolt D6:+;D5-D0: corresponding ASCII for 6 digits millivolt,Decimal point is fixed to 3 digits 7：D6D5D4D3D2D1D0 Relative zero point on D6 ： +/-;D5-D0:corresponding ASCII for 6 millivolt digits，Decimal point is fixed to 3 digits Zero calibration with...

  • Page 45: Error Code Explanation

    M02 Digital Indicator 6.2.2 Error Code Explanation 1：CRC check error 2：Operation code error 3：Parameters code error 4：Write data error 5：Operation invalid 6：Channel no. error Note：Default channel no. of this indicator : 1（31H） 6.2.3 Command Indicator will send weighing data to host computer after received command.
  • Page 46 M02 Digital Indicator STX —— 1bit，start character，02H R——1 bit，52H WT——2 bit，57H 54H E——1 bit，45H Status —— 2bits，high byte: 40H；low byte definition as follows: G./N. Null Null Zero point Stable weight 0：+ 0：non/zero 0： normal 0：not stable 1：- 1：zero 1：OFL 1：stable Weight Value ——...
  • Page 47 M02 Digital Indicator Correct response: Scale no. Channel No. Para. code Value Wrong response: Scale Channel Para. Error code code Here: Para. Value—— 1bit Para. code——2 bits， For example: 02 30 31 31 524D52 3839 0D 0A Correct response：02 30 31 31 52 4D 52 36 34 33 0D 0A（stable range：6）...
  • Page 48 M02 Digital Indicator Here: DC——2 bits，44H 43H O——1 bit，4FH K——1 bit，4BH Division value——2 bits，1/2/5/10/20/50 Max. capacity——6 bits For example: 02 30 31 3157 44 43 30 35 30 31 30 30 30 30 36 30 0D 0A(division value 5, Max...
  • Page 49 M02 Digital Indicator code code For example: 02 30 31 3157 5A 52 35 30 30 38 0D 0A（Write zeroing range to 50） Correct response: 02 30 31 31 57 5A 52 4F 4B 36 31 0D 0A Wrong response: 02 30 31 31 57 5A 53 45 33 32 38 0D 0A（Para. Code error）...
  • Page 50 M02 Digital Indicator Send command: Scale no. Channel No. Zero millivolt value Correct response: Scale no. Channel No. Wrong response: Scale no. Channel No. Error code Here: ZN——2 bits，5AH4EH Zero millivolt value——6 bits For example: 02 30 31 31 43 5A 4E 30 31 32 36 31 30 38 31 0D 0A Correct response:02 30 31 31 43 5A 4E 4F 4B 33 37 0D 0A Wrong response:02 30 31 31 43 5A 4E 45 34 30 34 0D 0A（Write data error）...
  • Page 51 M02 Digital Indicator Here: GY——2 bits，47H 59H Weight value——6 bits: Write in weight value For example: 02 30 31 3143 47 59 30 30 30 32 30 30 36 35 0D 0A（Write in: weight value 200） Correct response: 02 30 31 31 43 47 59 4F 4B 32 39 0D 0A Wrong response: 02 30 31 35 43 47 59 45 36 30 32 0D 0A（Channel no.
  • Page 52 M02 Digital Indicator 6.2.3.7 Zeroing Send command: Scale no. Channel No. Correct response: Scale no. Channel No. Wrong response: Scale no. Channel No. Error code For example: 02 30 31 31 4F 43 5A 38 34 0D 0A Correct response: 02 30 31 31 4F 43 5A 4F 4B 33 38 0D 0A Wrong response: 02 30 31 31 4F 43 5A 45 35 30 36 0D 0A（Operation can’t execuate）...

  • Page 53: Tt Toledo

    M02 Digital Indicator that the check code is 38,34 for the data frame. 6.3 tt TOLEDO Protocol When choose “tt” protocol in working parameter F2.3, indicator will send datas in continuous mode with TOLEDO protocol. Continuous sending mode format as below: C display weight(6 bits) 6 个...

  • Page 54: Cb920

    M02 Digital Indicator status byte B definition as below: Status Stable Overflow symbol G.W. Is 0 Is 1 Is 1 1-unstable 1-overflow 1-negative Is 0 (not change) (not change) (not change) 0-stable 0-normal 0-positive (not change) status byte C is reserved, output 20H.

  • Page 55: Recont

    M02 Digital Indicator ，—— 1 bit，separator 2CH G.W. —— 2 bits， GS: gross weight 47H 53H 0/1 —— 1 bit，(30H/31H) interleaved transmission Symbol —— 1 bit, 2BH（+）, 2DH（-） Display —— 7 bits，including decimal point Unit —— 2 bits，blank space（20H 20H）...

  • Page 56: Reread

    M02 Digital Indicator 2bits 7bits 47 53 6B 67 2B/2D Here: Status —— 2 bits，OL(OFL):4FH 4CH; ST(stable):53H 54H; US(unstable):55H 53H Display value —— 7bits, including decimal point, high bit is blank if no decimal point. For example: When indicator send the following automatically: 53 54 2C 47 53 2C 2B 30 31 31 2E 31 32 30 6B 67 0D 0A Means：Stable，Data value is positive，display value is 11.120kg...

  • Page 57: Modbus

    M02 Digital Indicator 2) Calibration zeroing command: TARE ON<CR><LF> : 54 41 52 45 20 4F 4E 0D 0A Return YES<CR><LF> or NO? <CR><LF> 3) Read ID no.: GET ID<CR><LF> : 47 45 54 20 49 44 0D 0A Return ASCII code with 6 digits ID no.

  • Page 58: Modbus Communication Address

    M02 Digital Indicator Code Definition Description Illegal data address Data address received from error code is not allowed Illegal data value Data wrote in is not in permissible range When indicator is trying to execuate operation required, machine fault unrecoverable error is produced.
  • Page 59 M02 Digital Indicator The following items are two bytes and are available to read and write (write code 0x06，read code 0x03） 40007 0006 Zeroing(zeroing when write in non-zero value) 40008 0007 Automatically zeroing when power on（0：OFF；1：ON） 40009 0008 Zero tracking range（0-9d）...
  • Page 60 M02 Digital Indicator 40023 0022 Zero calibration with weights: write in 1 and calibrate zero with the current weight. 40024 0023 Read: Absolute millivolt of current load cell 40025 Zero calibration without weights: Write millivolt value at 0024 zero；Write in range（load cell 3mV/V:millivolt value range...
  • Page 61 M02 Digital Indicator 40046~40047 Set point 1 set value2 0045~0046 40048 0047 Set point 2 stable or not（0：no；1：yes） 40049 0048 Set point 2 min. duration time（0-999 : 0-99.9sec.） 40050 0049 Set point 2 valid condition 40051~40052 0050~0051 Set point 2 set value1...
  • Page 62 M02 Digital Indicator 40072 0071 I/O output value Note: available only when coil address 00016 is valid. I/O input value Input write 1 valid，0 invalid. 40073 0072 Read 1 valid，0 invalid Reserved 40401 0400 Current weight value( 4 bytes with symbolic number,...
  • Page 63 M02 Digital Indicator 49003 9002 If display 141024, means 24 Oct., Develop time 49004 9003 2014 The following items are bit read only. （read code：0 x 0 1） 00001 0000 0：unstable； 1：stable 00002 0001 0：normal；1：OFL 00003 0002 0：non-zero；1：zero 00004 0003 0：+；1：-...
  • Page 64 M02 Digital Indicator 00014 0013 Reserved 00015 0014 Reserved 00016 0015 I/O testing switch 00017 0016 Set point 1 status 00018 0017 Set point 2 status Only read： 0:invalid，1:valid 00019 0018 Set point 3 status 00020 0019 Set point 4 status...

  • Page 65: Password Input And Setting, Reset

    M02 Digital Indicator 7 Password Input and Setting, Reset 7.1 Password Input （1）Indicator calibration and working paraters setting default password: 000000. （2）User can set password in parameters when F4.1 is“ON”. （3）When display is “PASS”, need to input correct password to enter parameters.
  • Page 66 M02 Digital Indicator （2）User must input same new password twice in setting password,If not same, main display show“Error”one second and return to PASS again.

  • Page 67: Factory Reset

    M02 Digital Indicator 7.3 Factory Reset Note: Factory reset is only for special technicists, which will reset all of parameters and will maybe cause not working. Take reset all for example: working status, Normal working status SET UP press 1 time to display SET UP.
  • Page 68 M02 Digital Indicator 1 ） In F SEt interface, press to reset working parameters, enter into reset calibration paramters F SEt interface. 2）In F SEt interface, press ，not to make working parameter reset, enter into calibration para. Reset interface. 1）In F CAL interface, press to reset calibration para., enter into reset all interface.

  • Page 69: Display Testing

    M02 Digital Indicator 8 Display Testing The following flow chart is to test lights on main-display and status lights. Normal weighing status Under parameter interface, Press 5 times press switch to“tESt”interface. Under“tESt”interface,press to make display testing, 8.8.8.8 Nixie tube display and indicator lights shine.

  • Page 70: Errors And Alarm Messages

    M02 Digital Indicator 9 Errors and Alarm Messages Error ①Input error. ②wrong data beyond parameter range. Error 2 The present weight value is out of zeroing range. Error 3 Scale platform is not stable when zeroing. Error 4 Input wrong password more than 3 times.

  • Page 71: Dimension Of Indicator

    M02 Digital Indicator 10 Dimension of Indicator Dimension of rear panel:92×45(mm) Dimension of front panel:105×57(mm) Panel cutout dimension:93×46(mm)

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