General Measure GM8802C-D User Manual
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General Measure GM8802C-D User Manual

Weighing transmitter
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GM8802C-D
User Manual
GM8802C-D110101
48010224231000

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Summary of Contents for General Measure GM8802C-D

  • Page 1 GM8802C-D User Manual GM8802C-D110101 48010224231000...

  • Page 2: Table Of Contents

    CONTENTS 1 General Description ....................1 1.1 Functions and Features ..................1 1.2 Front Panel ......................2 1.3 Technical Specifications ..................3 1.4 Dimensions ......................5 2 Installation ........................ 6 2.1 Connection of Power Supply ................6 2.2 Connection of Load Cell ..................6 2.3 Connection of Serial Interface................

  • Page 3: Table Of Contents

    4 Setting Parameter ....................244 4.1 Flow Chart of Setting Parameters ...............244 4.2 Method of Setting Parameters ..............311 5 Serial Communication ..................333 5.1 EASY Protocol .....................33 5.2 RE Protocol ....................36 5.3 RS Protocol ....................39 5.4 SP1 Protocol ....................58 5.5 Modbus Protocol ..................77 5.6 tt TOLEDO Protocol ..................98 5.7 RDP Philips Protocol ..................99 6 Operation ......................101...

  • Page 4: General Description

    GM8802C-D Weighing Transmitter 1 General Description GM8802C-D weighing transmitter is specially designed for industrial weighing field. It has the features of steady characteristics, easy to operate. It is widely used in concrete, bitumen mixing plants, blast furnace and converter, etc..

  • Page 5: Front Panel

    GM8802C-DWeighing Transmitter 1.2 Front Panel Main Display: 6 digits, for displaying weight, analog output value, and the information of parameters. Status Indicator Lamp:  ZERO: Zero position. Light up when present weight on the platform is within 0±1/4d.  STAB：Light up when changes of weight values are within stability criterion range. GM8802C-D110101...

  • Page 6: Technical Specifications

    GM8802C-D Weighing Transmitter  DATA: Light up when data transmission. Keypad: key to zeroing and exit from the current function status. key to choose the parameter items. key to choose the functions of parameter setting. key to enter items (when setting parameters or calibration) or confirm the current function.
  • Page 7 GM8802C-DWeighing Transmitter 1.3.2 Analog Part： Load cell exciting voltage ：DC5V 200mA（MAX） Input resistance ：10MΩ Zero point adjustment range：0.2～8mV when the sensor is 2mV/V; 0.02～12mV when the sensor is 3mV/V; Input sensitivity ：0.1uV/d Input range：0.2～10.5mV (when the sensor is 2mV/V) 0.02～15mV(when the sensor is 3mV/V) A/D conversion：...

  • Page 8: Dimensions

    GM8802C-D Weighing Transmitter 1.4 Dimensions Dimension of front panel: Length：82mm Width：92mm Hight：45mm GM8802C-D110101...

  • Page 9: Installation

    DC-: Negative pole 2.2 Connection of Load Cell GM8802C-D weighing transmitter need to be connected with bridge type resistance strain gauge load cells as below figures. When you chose the four-wired load cells, you must bridge the SN+ with EX+ and bridge the SN- with EX-.
  • Page 10 GM8802C-D Weighing Transmitter The signal definition of each port of the load cell connector as follows: Port SIG+ SIG- Connection Excitation+ Sense+ Excitation- Sense- Signal+ Signal- Shield 2.2.1 6-Wired Connection Load cell GM8802C-D110101...
  • Page 11 GM8802C-DWeighing Transmitter 2.2.2 4-Wired Connection Load cell GM8802C-D110101...
  • Page 12 GM8802C-D Weighing Transmitter 1. The signals from the load cells are low voltage analog signals, which are easily affected by electro-noise, so the cables connecting load cells to indicator should use shielded cables, and not bind with other cables, especially power supply cables.

  • Page 13: Connection Of Serial Interface

    GM8802C-DWeighing Transmitter 2.3 Connection of Serial Interface GM8802C-D supplies one serial interface that can be chosen as RS232 or RS485. The definition is as follows: l l e RS232 Connection:： RS485 Connection： l l e GND is ground of RS485, it can very...

  • Page 14: Calibration

    3 Calibration 3.1 Descriptions of Calibration （1）Calibration procedure must be executed when a GM8802C-D weighing transmitter 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 15: Flow Chart Of Setting Parameters

    GM8802C-DWeighing Transmitter （5）During calibration, please refer to page108“8. Error and Alarm Messages” for details. 3.2 Flow Chart of Setting Parameters 1.Under normal status, press twice, then display CAL, press to enter password inputting interface. 2.When displaying PASS, press , then input the correct password, CAL ON displayed for one second , then automatically enter Decimal position 3.Press...
  • Page 16 GM8802C-D Weighing Transmitter 4.Press to select a desired Min. division (1、2、5、 10、20 or 50), then press to save and enter next Max. capacity setting. But if no need to change, press directly to enter next step. 5. Input Max. Capacity(≤Min.Division×30000), then press to save and enter next step.
  • Page 17 GM8802C-DWeighing Transmitter 6. Press to select a desired sensitivity(2 or3), then press to save and enter next step. But if no need to change, press directly to enter next Millivolt value display interface. 7.During normal calibration, press to enter zero calibration.
  • Page 18 GM8802C-D Weighing Transmitter Follow the below flow chart, then you can finish gain calibration and enter password setting. If no need to gain calibrate, just press to enter next password setting interface. GM8802C-D110101...
  • Page 19 GM8802C-DWeighing Transmitter 9.Press to enter serial ports calibration switch setting, press to choose a desired position, then press again to enter next step. If no need to set the position of the switch ,just press to enter next password setting interface. 10.Finish password setting as page103 “6.3 Setting Password”, then return to normal status.

  • Page 20: Millivolt Value Display

    GM8802C-D Weighing Transmitter 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 21: Calibration With Weight

    GM8802C-DWeighing Transmitter 3.4 Calibration with Weight 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 weight. Zero millivolt Gain millivolt Weight value...

  • Page 22: Calibration Without Weight

    GM8802C-D Weighing Transmitter 3.5 Calibration without Weight When it is not convenient to load a weight to calibrate, calibration can be done without weight using recorded data in the table in section 3.8. However, this method is just used for some emergencies, it will make calibration result incorrect if load cells, or indicator has been replaced.
  • Page 23 GM8802C-DWeighing Transmitter GM8802C-D110101...

  • Page 24: Serial Ports Calibration Switch

    GM8802C-D Weighing Transmitter 3.6 Serial Ports Calibration Switch When calibration via serial ports(rS、SP1 or Modbus) is needed, the serial ports calibration switch must be “ON”, or the command of serial ports calibration will return to errors. 3.7 Log Table for Parameter Calibration 1...
  • Page 25 GM8802C-DWeighing Transmitter Gain SIOCAL Serial ports calibration switch PASS Password Setting 000000 GM8802C-D110101...

  • Page 26: Log Table For Parameter Calibration 1

    GM8802C-D Weighing Transmitter 3.8 Log Table for Parameter Calibration 2 Parameter Calibrated Value Data Remarks Decimal Point Min. Division Max. Capacity Sensor sensitivity Password Setting GM8802C-D110101...

  • Page 27: Setting Parameter

    GM8802C-DWeighing Transmitter 4 Setting Parameter 4.1 Flow Chart of Setting Parameters Press to select a desired item among sibling items; Press to enter minor terms, Press to return to last item; refer below list descriptions of parameters. GM8802C-D110101...
  • Page 28 GM8802C-D Weighing Transmitter Descriptions of Working Parameters Parameter Default Descriptions Setting Method Item 1 F1.1 00~99 Scale ID 4.2.1 F1.2 OFF/ON Automatic zeroing switch when 4.2.2 power up. Automatically zeroing if it is set “ON”. “Error2” Alarms if current value>Max. Capacity*Zeroing range;...
  • Page 29 GM8802C-DWeighing Transmitter automatically check the zero slight drifting caused by the residual material on the platform. Disabled if this parameter is set “0”. F1.4 Stability criterion range(1~9d optional):: If 4.2.1 the change of weight value is within stability criterion rang, then it is a stable status.
  • Page 30 GM8802C-D Weighing Transmitter 9：the strongest filter Steady filter F1.7 4.2.1 (the second filter based on the first filter)： 0：no filter； 9：the strongest filter Item 2 F2.1 1200~ 9600 Serial port Baud rate 4.2.2 57600 F2.2 rS/rE/bUS/ Serial port protocol 4.2.2...
  • Page 31 GM8802C-DWeighing Transmitter Cont Cont continuous mode） rE(rS/SP1or EASy) serial port communication mode. Ineffective when F2.2 is set as bUS /tt/rdP. F2.4 rtU/ASC rtU or ASCII; 4.2.2 Modbus protocol special communication mode. Ineffective when F2.2 is set as rE/rS/SP1/EASy/tt/rdP. Data frames format: 4.2.2 7-E-1/ 7-O-1/...
  • Page 32 GM8802C-D Weighing Transmitter 8-O-1/ 8-E-1：8data bits, Even Parity,1stop bit; 8-n-1/ 8-O-1：8data bits, Odd Parity,1stop bit; 8-n-2 8-n-1：8data bits, No Parity,1stop bit; 8-n-2：8 data bits, No Parity,2stop bits; Option of serial port speed, adjust the interval 4.2.2 between two data frames when continuous sending datas.
  • Page 33 GM8802C-DWeighing Transmitter Item 3 9 registers available for users，use system 4.2.1 F3.1～ 000000～ 000000 decimal point to display. Read-write through F3.9 999999 keys or serial ports（ModBus/RS/SP1）. Item 4 F4.1 OFF/ON Switch for parameter password setting 4.2.2 Setting parameter password：Effective when F4.2 000000 F4.1=ON...

  • Page 34: Method Of Setting Parameters

    GM8802C-D Weighing Transmitter 4.2 Method of Setting Parameters 4.2.1 Data Input Method GM8802C-D110101...
  • Page 35 GM8802C-DWeighing Transmitter 4.2.2Option Selecting Method GM8802C-D110101...

  • Page 36: Serial Communication

    GM8802C-D Weighing Transmitter 5 Serial Communication GM8802C-D has RS232 serial interface to communicate with upper computer. There are seven communication protocols: ：rS protocol /rE protocol /Modbus protocol (bus)/ fast protocol (EASy)/SP1 protocol /tt TOLEDO/rdP PHILIPS protocol. 5.1 EASY Protocol Communication mode can be set as continuous mode(Cont) and command mode （Read） .
  • Page 37 GM8802C-DWeighing Transmitter Code：binary system 5.1.1 Continuous Mode(Cont) Under this mode, the indicator will automatically transmit collected data to upper computer without command. A complete data frame consists of five bytes: one mark byte; one status byte and three data bytes(compressed BCD code, high-order ahead). Data Mark byte Status byte...
  • Page 38 GM8802C-D Weighing Transmitter For example: When the transmitter sends out a hexadecimal data as below: Data frames: FF 03 00 12 34 Refer to above data frame form, we know the data of main display is 1234, the status byte is 03( refer to “The definition of “Status byte”, the corresponding hexadecimal data is 00000011),...

  • Page 39: Re Protocol

    GM8802C-DWeighing Transmitter 5.2 RE Protocol Communication mode can be set as continuous mode(Cont) and command mode （Read） . 8data bits, 1 stop bit, Even parity ( 8- E-1) Data Frames： 8data bits, 1 stop bit, Odd Parity ( 8- O-1) 8data bits, 1 stop bit, No Parity (8- n-1)
  • Page 40 GM8802C-D Weighing Transmitter 5.2.1 Continuous Mode(Cont) Under this mode, the indicator will automatically transmit collected data to upper computer without command. The data frames as follows: Status ， ， Display value Unit Here: Status ——2bits; 4FH 4CH;OL(overflow);53H 54H; ST(stable);55H 53H; US(unstable) ，...
  • Page 41 GM8802C-DWeighing Transmitter LF ——0AH For example: When the transmitter sends out a date sequence as below: 53 54 2C 47 53 2C 2B 30 31 31 2E 31 32 30 4B 67 0D 0A Then we know the current status of indicator is: Stable;...

  • Page 42: Rs Protocol

    GM8802C-D Weighing Transmitter 5.3 RS Protocol Communication mode can be set as continuous mode(Cont) and command mode （Read） . 8data bits, 1 stop bit, Even parity ( 8- E-1) Data Frames： 8data bits, 1 stop bit, Odd Parity ( 8- O-1)
  • Page 43 GM8802C-DWeighing Transmitter CRC Check and Calculate Method: Count the sum of all the left bytes and convert the sum to be decimal date, and then convert the 2 low-order digits of the decimal date to ASCII code. For example, 02 4D 2B 30 31 30 2E 37 36 30, the sum is 1D6, convert it to decimal 470, then convert the last two numbers 7、0 to ASCII 37 30.
  • Page 44 Then we know current status is: stable, plus, and current weight value is 10.760. 5.3.2 Command Mode(Read) Under this mode, the indicator will transmit collected data to upper computer only when received command. 5.3.2.1 Reading the Current Status of GM8802C-D Sending Command format: GM8802C-D110101...
  • Page 45 GM8802C-DWeighing Transmitter Scale ID Received data sequence is correct: Scale ID Status Display value Received data sequence is incorrect: Scale ID Here: Scale ID —— 2bits，range: 00~99 R —— 1bit，52H S —— 1bit，53H 000 —— 3bits, 30H 30H 30H Status —— 1bit, 4DH:M(stable)；53H:S(unstable)；4FH:O(overflow) Display value——...
  • Page 46 GM8802C-D Weighing Transmitter stable status, current main display is -2.255） Incorrect response format：02 30 31 52 53 4E 4F 32 31 0D 0A 5.3.2.2 Reading Decimal Point Sending Command format: Scale ID Received data sequence is correct: Scale ID DDDDDD...
  • Page 47 GM8802C-DWeighing Transmitter 5.3.2.3 Reading the Sensitivity of Sensor Sending Command format: Scale ID Received data sequence is correct: Scale ID DDDDDD Received data sequence is incorrect: Scale ID Here: E—— 1bit，45H DDDDDD—— 6bits, 000000~000001 corresponding 2mV/V、3mV/V. For example: Command from upper computer：02 30 31 52 45 35 30 0D 0A Correct response format：02 30 31 52 45 30 30 30 30 30 30 33 38 0D 0A (the sensitivity of sensor is 2mV/V ) Incorrect response format：02 30 31 52 45 4E 4F 30 37 0D 0A...
  • Page 48 GM8802C-D Weighing Transmitter 5.3.2.4 Reading Max. Capacity and Division Value Sending Command format: Scale ID Received data sequence is correct: Scale ID Division value Max. Capacity Received data sequence is incorrect: Scale ID Here: M —— 1bit，4DH Division value —— 2bits, 1、2、5、10、20、50 optional Max.
  • Page 49 GM8802C-DWeighing Transmitter 5.3.2.5 Reading the Working Parameters Sending Command format: Scale ID Working parameter Received data sequence is correct: Scale ID Working parameter DDDDDD Received data sequence is incorrect: Scale ID Here: F —— 1bit，46H Working parameter —— 2 bits, confirm the working parameter according to current data DDDDDD——...
  • Page 50 GM8802C-D Weighing Transmitter 5.3.2.6 Serial Zeroing Function Sending Command format: Scale ID Received data sequence is correct: Scale ID Received data sequence is incorrect: Scale ID Here: C —— 1bit, 43H K —— 1bit, 4BH For example: Command from upper computer：02 30 31 43 43 33 33 0D 0A Correct response format：02 30 31 43 43 4F 4B 38 37 0D 0A...
  • Page 51 GM8802C-DWeighing Transmitter Scale ID Decimal point position Received data sequence is correct: Scale ID Received data sequence is incorrect: Scale ID Here: P —— 1bit, 50H Decimal point position —— 1bit, range 0~4 For example: Command from upper computer：02 30 31 43 43 33 33 0D 0A Correct response format：02 30 31 43 43 4F 4B 38 37 0D 0A Incorrect response format：02 30 31 43 43 4E 4F 39 30 0D 0A 2 .
  • Page 52 GM8802C-D Weighing Transmitter Received data sequence is incorrect: Scale ID Here: M —— 1bit, 4DH Division value —— 2bits, writing Min. division value （1、2、5、10、20、50） Max. Capacity —— 6bits, writing Max. Capacity For example: Command from upper computer：02 30 31 43 4D 30 35 30 31 34 30 30 30 33 37 0D 0A （Writing data：division value is 5，Max.
  • Page 53 GM8802C-DWeighing Transmitter Scale ID Here: E —— 1bit, 45H Sensitivity of Sensor —— 1bit, range 0~1 For example: Command from upper computer：02 30 31 43 45 30 38 33 0D 0A（Writing data：sensitivity of sensor is 0, that is 2mV/V） Correct response format：02 30 31 43 45 4F 4B 38 39 0D 0A Incorrect response format：02 30 31 43 45 4E 4F 39 32 0D 0A 4 .
  • Page 54 GM8802C-D Weighing Transmitter Here: Z —— 1bit, 5AH For example: Command from upper computer：02 30 31 43 5A 35 36 0D 0A Correct response format：02 30 31 43 5A 4F 4B 31 30 0D 0A Incorrect response format：02 30 31 43 5A 4E 4F 31 33 0D 0A...
  • Page 55 GM8802C-DWeighing Transmitter Command from upper computer： 02 30 31 43 59 30 30 31 32 36 31 35 33 0D 0A （Writing data: zero millivolt value is 1.261） Correct response format：02 30 31 43 59 4F 4B 30 39 0D 0A Incorrect response format：02 30 31 43 59 4E 4F 31 32 0D 0A 5.
  • Page 56 GM8802C-D Weighing Transmitter Weight value —— 6bits; write in the standard weight value For example: Command from upper computer： 02 30 31 43 47 30 30 30 32 30 30 32 37 0D 0A（writing data: the weight value is 200）...
  • Page 57 GM8802C-DWeighing Transmitter L —— 1bit, 4CH Millivolt value —— 6bits; corresponding gain millivolt value of current weight value Weight value —— 6bits; standard weight value For example: Command from upper computer：02 30 31 43 4C 30 30 30 31 39 34 30 30 30 32 30 30 33 34 0D 0A（writing data: the weight value is 200, corresponding gain millivolt value is 0.194）...
  • Page 58 GM8802C-D Weighing Transmitter F —— 1bit, 46H Working parameter value —— 2bits; confirm the working parameter item according to current data Parameter value —— 6bits; write-in the parameter value For example: Command from upper computer：02 30 31 57 46 31 34 30 30 30 30 30 30 35 39 38 0D 0A （write-in range of motion detecting F1.4 is 5）...
  • Page 59 GM8802C-DWeighing Transmitter Parameter —— 2bits; 33H 31H--33H 39H(represents reading F3.1--F3.9) DDDDDD —— 6bits; parameter value of register For example: Command from upper computer：02 30 31 52 52 33 31 30 31 31 0D 0A(reading F3.1) Correct response format：02 30 31 52 52 33 31 30 30 30 30 35 30 30 30 34 0D 0A Incorrect response format：02 30 31 52 52 4E 4F 32 30 0D 0A 5.3.2.10 Writing Register 1-9...
  • Page 60 GM8802C-D Weighing Transmitter Command from upper computer：02 30 31 57 52 33 31 30 30 30 30 35 30 30 30 39 0D 0A (writing F3.1 “500”) Correct response format：02 30 31 57 52 4F 4B 32 32 0D 0A Incorrect response format：02 30 31 57 52 4E 4F 32 35 0D 0A...

  • Page 61: Sp1 Protocol

    GM8802C-DWeighing Transmitter 5.4 SP1 Protocol Communication mode can be set as continuous mode(Cont) and command mode （Read） . 8data bits, 1 stop bit, Even parity ( 8- E-1) Data Frames： 8data bits, 1 stop bit, Odd Parity ( 8- O-1) 8data bits, 1 stop bit, No Parity (8- n-1)
  • Page 62 GM8802C-D Weighing Transmitter Operation code: W, writing operation; R, reading operation; C, calibration; O, zeroing 5.4.1 Explanation form for parameter code Operation Parameter Parameter name Characters code code Reading current status and weight value Writing Max. capacity and Min. division...
  • Page 63 GM8802C-DWeighing Transmitter Automatic zeroing switch Range of Zero-Tracking Range of motion detecting Range of zeroing Digital filter parameter Steady state filter R 1-R 9 Register 1-9 Absolute Millivolt 7bits: D6D5D4D3D2D1D0; value D6:+;D5-D0:ASCII code of 6bits GM8802C-D110101...
  • Page 64 GM8802C-D Weighing Transmitter corresponding Millivolt value Decimal point:4bits Millivolt value of 7bits: D6D5D4D3D2D1D0; relative zero D6:+/ - ;D5-D0: ASCII code of 6bits corresponding Millivolt value; Decimal point:4bits Zero calibration with weight Zero calibration without weight Gain calibration GM8802C-D110101...
  • Page 65 GM8802C-DWeighing Transmitter with weight Gain calibration without weight Zeroing 5.4.2 Explanation form for wrong code Under communication mode, if the transmitter received wrong data frame, there will be a wrong code as below: 1.CRC check error 2. Operation code error 3.Parameter code error 4.Writing data error 5.Operation can’t be performed 6.channel number error...
  • Page 66 GM8802C-D Weighing Transmitter 5.4.3 Continuous Mode “Cont” Under this mode, the indicator will automatically transmit collected data to upper computer without command. The data frames as follows: Scale ID Channel NO Status Weight value Here: STX——1bit; Start:02H Scale ID ——2bits; range is 00~99 Status ——2bits;...
  • Page 67 GM8802C-DWeighing Transmitter CRC —— 2bits, check sum CR —— 1bit，0DH LF —— 1bit，0AH For example: Automatically return to data: 02 30 31 31 40 40 30 30 32 31 36 35 37 38 0D 0A Then we know the current status of indicator is: Stable;...
  • Page 68 GM8802C-D Weighing Transmitter Scale Channel Status Display value Received data sequence is incorrect: Scale Channel Wrong code Here: STX——1bit; Start:02H R ——1bit;52H WT —— 2bits; 57H 54H —— 1bit; 45H Status ——2bits; High Byte:40H; The definition of Low Byte is as below:...
  • Page 69 GM8802C-DWeighing Transmitter Wrong code —— 2bits; refer to the explanation for wrong code For example: Command from upper computer：02 30 31 31 52 57 54 30 31 0D 0A Correct response format：02 30 31 31 52 57 54 40 40 30 30 30 31 33 32 32 33 0D 0A（stable status, current main display is 0.132）...
  • Page 70 GM8802C-D Weighing Transmitter for example, if need to read range of motion detecting, then input corresponding parameter code MR(4DH 52H). For example: Command from upper computer：02 30 31 31 52 4D 52 38 39 0D 0A Correct response format： 02 30 31 31 52 4D 52 35 34 32 0D 0A （range of motion detecting: 5）...
  • Page 71 GM8802C-DWeighing Transmitter O —— 1bit, 4FH K —— 1bit, 4BH Division value——2bits, 1/2/5/10/20/50 Max. capacity——6bits, write-in Max. capacity value For example: Command from upper computer：02 30 31 31 57 44 43 30 35 30 31 30 30 30 30 36 30 0D 0A （division value is 5；Max.
  • Page 72 GM8802C-D Weighing Transmitter For example: Command from upper computer：02 30 31 31 57 5A 52 35 30 30 38 0D 0A（write-in zeroing range “50”） Correct response format：02 30 31 31 57 5A 52 4F 4B 36 31 0D 0A Incorrect response format：02 30 31 31 57 5A 52 45 31 32 35 0D 0A 5.4.4.5 Zero Calibration...
  • Page 73 GM8802C-DWeighing Transmitter Command from upper computer：02 30 31 31 43 5A 59 39 34 0D 0A Correct response format：02 30 31 31 43 5A 59 4F 4B 34 38 0D 0A Incorrect response format：02 30 31 31 43 5A 59 45 35 31 36 0D 0A 2) Zero Calibration without Standard Weight Sending Command format: Scale ID...
  • Page 74 GM8802C-D Weighing Transmitter 5.4.4.6 Gain Calibration 1) Gain Calibration with Standard Weight Add a standard weight approaching 80% of the Max. capacity ,then write in the current value of the standard weight to finish gain calibration. Sending Command format: Scale ID Channel NO.
  • Page 75 GM8802C-DWeighing Transmitter Correct response format：02 30 31 31 43 47 59 4F 4B 32 39 0D 0A Incorrect response format：02 30 31 32 43 47 59 45 36 39 39 0D 0A 2) Gain Calibration without Standard Weight Input the standard weight value in Appendix and the corresponding gain Millivolt value to finish gain calibration.
  • Page 76 GM8802C-D Weighing Transmitter Command from upper computer： 02 30 31 31 43 47 4E 30 30 31 39 34 30 30 30 30 32 30 30 35 36 0D 0A（Writing data：weight value is 200，corresponding gain millivolt is 0.194） Correct response format：02 30 31 31 43 47 4E 4F 4B 31 38 0D 0A Incorrect response format：02 30 31 31 43 5A 52 45 33 30 37 0D 0A...
  • Page 77 GM8802C-DWeighing Transmitter 5.4.4.8 Reading Register 1-9 Sending Command format: Scale ID Parameter code Received data sequence is correct: Scale ID Parameter code DDDDDD Received data sequence is incorrect: Scale ID Parameter code Here: Parameter code —— 2bits, R1—R9，refer to parameter address of registers to write-in parameter codes, for example, write-in register F3.3, then the parameter code is R3（52H 33H）...
  • Page 78 GM8802C-D Weighing Transmitter 5.4.4.9 Writing Register 1-9 Sending Command format: Scale ID Parameter code DDDDDD Received data sequence is correct: Scale ID Parameter code Received data sequence is incorrect: Scale ID Parameter code Here: Parameter code —— 2bits, R1—R9，refer to parameter address of registers to write-in parameter codes, for example, write-in register F3.3, then the parameter code is R3（52H...
  • Page 79 GM8802C-DWeighing Transmitter 5.4.4.10 CRC Count Count the sum of all the left bytes and convert the sum to be a decimal data, and then convert the last 2 low-order digits of the decimal date to ASCII code. For example: See below data frame: Check bit The sum:180(Hex) 384(decimal data)

  • Page 80: Modbus Protocol

    GM8802C-D Weighing Transmitter ■5.5 Modbus Protocol 5.5.1 Modbus Communication Mode RTU Mode Under this mode, every 8-bit byte of the message are divided into 2pcs of 4-bit hexadecimal characters to transmit at binary code. The data frame as below: 8data bits, 1 stop bit, Even parity ( 8- E-1) Data Frames：...
  • Page 81 GM8802C-DWeighing Transmitter Code：binary system ASCII Mode Under this mode, every 8-bit byte is transmitted as 2 pcs of ASCII characters. The data frame: 8data bits, 1 stop bit, Even parity ( 8- E-1) 8data bits, 1 stop bit, Odd Parity ( 8- O-1) Data 8data bits, 1 stop bit,...
  • Page 82 GM8802C-D Weighing Transmitter Baud Rate：1200/2400/4800/ 9600/ 19200/ 38400/ 56700(Optional) Code：ASCII Code 5.5.2 Modbus Communication Address PLC address Display Explanation address Below Contents are Read-Only Register(function code is0x03) 40001 0000 Current weight value(4 bytes with sign digits, high-order ahead) 40002 0001...
  • Page 83 GM8802C-DWeighing Transmitter Below Contents are 2 bytes for Writing and Reading (Writing function code: 0x06) Reading function code: 0x03) 40008 0007 Automatically zeroing when power on ( 0: OFF;1:ON) （ ） 40009 0008 Range of Zero-Tracking（0-9） 40010 0009 Range of motion detecting（1-9） 40011 0010 Range of zeroing（0%-99%）...
  • Page 84 GM8802C-D Weighing Transmitter 40020 0019 Zero calibration with weight: write-in data”1”,zero calibration with current weight value. sensor sensitivity is 2 m V / V: Range of Millivolt value is（0.000- 9.000mV）; sensor sensitivity is 3 m V / V:Range of Millivolt value is (0.000- 13.000mV);...
  • Page 85 GM8802C-DWeighing Transmitter Below Contents are 4 bytes for Writing and Reading (Writing function code: 0x10; Reading function code: 0x03) Max. capacity; 40031-0032 0030-0031 Input range is(Max. capacity ≤Min. division*30000) Gain calibration with weight; 40033-0034 0032-0033 Input standard weight value(≤ Max. capacity) Gain calibration without weight;Input gain Millivolt value(sensor sensitivity is 2mV/V:0.000＜millivolt 40035-40036...
  • Page 86 GM8802C-D Weighing Transmitter F3.1 storage address 40039-40040 00038-000 …… ……40055-4 39……000 F3.9 storage address 0056 54-00055 Below are Read-Only Contents (function code: 0 x 0 1 ) 00041 0040 0：Stable; 1：Unstable 00042 0041 0：Normal； 1：Overflow 00043 0042 0：Not zero； 1：Zero;...
  • Page 87 GM8802C-DWeighing Transmitter 5.5.3 Explanation of Function Code There are 5 function codes in above Modbus communication protocol:01 Reading the status of the coil;03 Reading holding register; 05 Force single coil;；06 Preset single holding register; 16 (10 Hex) preset multiple holding registers. 01 Reading the Status of the Coil Query: Query information assigns the starting coil and the quantity of coil.
  • Page 88 GM8802C-D Weighing Transmitter For example: Request to read 40 43 coil from Transmitter 01 Under RTU Mode for communication: Query command: Transmitter Function Start The Number CRC Check Address Code Address of Coils 1 byte 1 byte 2 bytes 2 bytes...
  • Page 89 GM8802C-DWeighing Transmitter Under ASCII Mode for communication: Query command: Start Transmitter Function Start TheNumber Address Code Address of Coils Check character characters characters characters characters characters characters Received data sequence is correct: Start Transmitter Function Counting Data Address Code Byte District Check character...
  • Page 90 GM8802C-D Weighing Transmitter The corresponding status of coil 43 40: 0 0 1 0 03 Reading Register Status Query: uery information assigns the start address and number of the registers. Response:Response information assigns the byte number of the reading register, each register corresponds to 2 bytes;...
  • Page 91 GM8802C-DWeighing Transmitter Received data sequence is correct: Transmitter Function Counting Register0007 Register0008 Address Code Byte Data Data Check 1byte 1byte 1byte 2bytes 2bytes 2bytes Query command：01 03 00 07 00 02 75 CA Received data sequence is correct：01 03 04 00 00 00 05 3A 30 The data for Register 0007and Register 0008:0（Hex：0000H）、5（Hex：0005H）...
  • Page 92 GM8802C-D Weighing Transmitter character characters characters characters characters characters characters Received data sequence is correct: Start Transmitter Function Counting Register Register address code byte Check 0007 0008 character characters characters characters characters characters characters characters Query command：3A 30 31 30 33 30 30 30 37 30 30 30 32 46 33 0D 0A Received data sequence is correct：3A 30 31 30 33 30 34 30 30 30 30 30 30 30 35 46 33 0D 0A...
  • Page 93 GM8802C-DWeighing Transmitter For example: Force the 0056 coil of Transmitter01 is ON status Under RTU Mode: Force command: Transmitter Function Coil Forced Address Code Address Data Check 1 byte 1 byte 2 bytes 2 bytes 2 bytes Received data sequence is correct: Transmitter Function Coil...
  • Page 94 GM8802C-D Weighing Transmitter Under ASCII Mode: Force command: Start Transmitter Function Coil Forced address code address data check character characters characters characters characters characters characters Received data sequence is correct: Start Transmitter Function Coil Forced address code address data check...
  • Page 95 GM8802C-DWeighing Transmitter 06 Preset Single Register Preset: Preset information assigns the address and value of the register need to be preset. Response: The register returns to normal response after presetting. For example: Please preset register 0009 of transmitter NO.1 to 0005H. Under RTU Mode: Preset command: Transmitter...
  • Page 96 GM8802C-D Weighing Transmitter 1 byte 1 byte 2 bytes 2 bytes 2 bytes Preset command：01 06 00 09 00 05 99 CB Correct response：01 06 00 09 00 05 99 CB The value of register 0009 is 5（Hex：0005H） Under ASCII Mode:...
  • Page 97 GM8802C-DWeighing Transmitter Preset command：3A 30 31 30 36 30 30 30 39 30 30 30 35 45 42 0D 0A Correct response：3A 30 31 30 36 30 30 30 39 30 30 30 35 45 42 0D 0A The value of register 0009 is 5（Hex：0005H） 16（10 hex）...
  • Page 98 GM8802C-D Weighing Transmitter Transmitter Function Start The number of address code address registers check 1byte 1byte 2bytes 2bytes 2bytes Preset command：01 10 00 1E 00 02 04 00 01 73 18 07 D5 Correct response：01 10 00 1E 00 02 21 CE...
  • Page 99 GM8802C-DWeighing Transmitter Correct response：3A 30 31 31 30 30 30 31 45 30 30 30 32 43 46 0D 0A 5.5.4 Error Message under Modbus Communication The transmitter sends message back to the host when detected error except check code (CRC or LRC) .
  • Page 100 GM8802C-D Weighing Transmitter Transmitter Function Abnormal address code code check 1byte 1byte 1byte 2bytes Under ASCII mode: Start Transmitter Function Abnormal address code code check 1byte 2bytes 2bytes 2bytes 2bytes 2bytes For example: The upper computer reads coil (0040)using function code 03.

  • Page 101: Tt Toledo Protocol

    GM8802C-DWeighing Transmitter it’s not allowed. 5.6 tt TOLEDO Protocol Please refer to parameter F2.2 and choose “tt” TOLEDO protocol，under this status, the transmitter will continuously sends data trough “tt” TOLEDO protocol. The continuous mode “Cont” format of tt protocol as following: ︸...

  • Page 102: Rdp Philips Protocol

    GM8802C-D Weighing Transmitter Status Word B is defined as following: Even parity Transmitter Unit Stable Overflow Sign G/N.W status Status Word C(Reserve) 5.7 RDP Philips Protocol Please refer to parameter F2.2 and choose “RDP” protocol，under this status, the transmitter will continuously sends data trough “RDP” protocol. Every sending delay is the value of F2.6(ms).
  • Page 103 GM8802C-DWeighing Transmitter STATUS 1 st: B i t S t a t u s E x p l a n a t i o n Fixed 0 Fixed 1 Fixed 1 1 : e r r o r o r o v e r f l o w 1 : s t a b l e ;...

  • Page 104: Operation

    GM8802C-D Weighing Transmitter 6 Operation 6.1 Zeroing Operation Under normal status, press to zeroing the data on main-display . Errors alarm during zeroing: "Error 2"： alarms when “current weight value”> “zeroing range” during zeroing operation; "Error 3"：alarms when current weight display or system is not stable during zeroing operation.
  • Page 105 GM8802C-DWeighing Transmitter calibration password must be input before calibration. （3）During parameter setting, if F4.1(password switch is set as“ON”，.password must be input when entering parameter setting interface. GM8802C-D110101...

  • Page 106: Setting Password

    （3）If the password your entered for the third time is still incorrect, GM8802C-D will display "Error 4" and enter self-locking status, then you must power up again to operation. 6.3 Setting Password （1）There are “setting parameter”...
  • Page 107 GM8802C-DWeighing Transmitter input twice and the two inputting passwords are same; If the two inputting passwords are not same, the GM8802C-D will display "Error" for one second, then return to password setting interface(PASS). GM8802C-D110101...

  • Page 108: Recover Initial Settings

    6.4 Recover Initial Settings Note: Recover initial settings means that recover all parameters’ settings to initial value, this operation may leads to abnormal working of GM8802C-D transmitter, so please don’t operate except professional person! For example( recover all parameter settings): 1.Under normal working status, press...
  • Page 109 GM8802C-DWeighing Transmitter ※After recovering operation, all parameter values will turn to initial values. ※Press if you want to abandon recovering operation and return to weighing status. Note: 1) Under “F SET”interface, press to recover working parameter settings. start recovering initial settings. 2) Under “F CAL”...

  • Page 110: Display Test

    GM8802C-D Weighing Transmitter 7 Display Test Under normal status, display test is shown in flow chart below. If the test result is the same as flow chart, it means that display and indicator lamps all work well. GM8802C-D110101...

  • Page 111: Errors And Alarm Messages

    GM8802C-DWeighing Transmitter 8 Errors and Alarm Messages ①Input error. ②Incorrect data input, please check the corresponding parameter Error range. Error 2 The current weight is not within the zeroing range when zeroing. Error 3 The current weight value display (system) is not stable when zeroing. Error 4 Password input is incorrect for 3 times.

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