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General Measure GM7702 User Manual

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GM7702
User Manual
GM7702-00180101
110607040003
VER01.00.12

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Summary of Contents for General Measure GM7702

  • Page 1 GM7702 User Manual GM7702-00180101 110607040003 VER01.00.12...
  • Page 2 This manual is subject to change without notice at any time to improve the product. No part of this manual can be photocopied, reproduced, or translated into another language without the prior written consent of the General Measure Company. Website: http://www.gmweighing.com...

  • Page 3: Table Of Contents

    Table of Contents 1 General Description................. - 1 - 1.1 Functions and Characteristics..........- 1 - 1.2 Front Panel Description............- 2 - 1.3 Connector diagram............... - 3 - 1.4 Technical Specifications............- 4 - 1.4.1 Common:..............- 4 - 1.4.2 Analog:..............- 4 - 1.4.3 Digital:..............
  • Page 4 3.2 Data Input................- 20 - 4. Calibration..................- 22 - 4.1 Description................. - 22 - 4.2 Calibration Parameter............- 22 - 4.2.1 Empty Scale Calibration......... - 23 - 4.2.2 Weight Calibration..........- 24 - 4.2.3 Calibration without Weight........- 25 - 4.3 Calibration Record.............
  • Page 5 8.3 Modbus RTU、Modbus ASCII protocol......- 45 - 8.4 Chi mei PT650D Protocol..........- 53 - 9 Dimension..................- 55 -...

  • Page 6: General Description

    GM7702 User Manual 1 General Description GM7702 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 Description

    GM7702 User Manual 1.2 Front Panel Description Status: ZERO: Light on when material weight is 0±1/4d.  STAB: Light on when material weight is within stable range.  NET: Light on when indicator is in net weight status.  COM: Light on when in communication status.

  • Page 8: Connector Diagram

    GM7702 User Manual analog switching display. 1.3 Connector diagram - 3 -...

  • Page 9: Technical Specifications

    GM7702 User Manual 1.4 Technical Specifications 1.4.1 Common: Power supply: DC24V±5% Working temperature: -10～40℃ Max humidity: 90%R.H without dew Power consumption: about 0.8W 1.4.2 Analog: Load cell power: DC5V 100mA（MAX） Input impedance: 10MΩ Zero steady range: 0.00~12mV (Load cell 3mV/V) Input sensitivity: 0.1uV/d...
  • Page 10 GM7702 User Manual Decimal point: 5 types (optional) Function keys: 4 keys soniferous keypad - 5 -...

  • Page 11: Installation And Wiring

    GM7702 User Manual 2 Installation and Wiring 2.1Connection of Power Supply GM7702 weighing indicator connects with DC24V power supply as follows, which has two lines connecting ports. The correct wiring of the power terminal is shown in the figure below: Plea ※...
  • Page 12 GM7702 User Manual 4 wires SHLD 2.2.1 Load Cell Connection Note: - 7 -...

  • Page 13: Connection Of I/O Terminal

    3．For more load cells parallel connection, their sensitivity (mV/V) should be the same. 2.3 Connection of I/O Terminal GM7702 weighing indicator has equipped with I/O module of 2 IN and 3 OUT. IN/OUT function user can self-define. To facilitate users wiring and some special applications, the...
  • Page 14 GM7702 User Manual Indicator input terminal connection: Indicator output terminal connection: - 9 -...

  • Page 15: Serial Port Output

    GM7702 User Manual 2.4 Serial Port Output GM7702 weighing indicator possesses RS232 and RS485 serial port, which support Modbus-RTU protocol, r-SP1,r-Cont and Chi mei PT650D protocol. Communication parameters: Item Option Description initial value: 01; range: 01-99. ID No. initial value: 38400; option: 9600, 38400, baud rate 57600, 115200.
  • Page 16 GM7702 User Manual RS232 Connection mode: computer - 11 -...

  • Page 17: Connection Of Analog

    GM7702 User Manual 2.5 Connection of Analog There are two types of analog output: 1) Voltage output: 0-5V, 0-10V. 2) Current output: 4-20mA. 3) User-define function: user can define analog output type and output range. Analog parameter Item Option Description...
  • Page 18 GM7702 User Manual To set analog output value of zero point weight value. Zero output initial value: value 00.000 To set analog output value of max. capacity. Max. capacity initial value: output value 00.000 To set max. analog output value. (It will not change if Max.
  • Page 19 GM7702 User Manual The indicator has been calibrated on the analog output when it leaves the factory, user no need to calibrate the analog output. If the analog output is abnormal, user can calibrate the analog output by himself (it is recommended to calibrate under the guidance of a professional).

  • Page 20: Data Input And Parameters

    GM7702 User Manual 3 Data Input and Parameters 3.1 Parameters List In the status of weighing, user could enter parameter interface by MODE key, and change item by TARE or MODE, then press ENTER to edit parameter. Item Parameter Parameter...
  • Page 21 GM7702 User Manual Stable if weight value changes within set time and range. stable time initial value: 1.0. (Range: 0.0~9.9s) initial value: 01 (1%~99% of full capacity) zero range Zero range allowed. initial value: 5 (Range: 0~9) digital filter Stronger filter grade, more stable weight grade value.
  • Page 22 GM7702 User Manual unit decimal point division max. capacity remote Calibration calibration parameters calibration ON/OFF calibration with weight calibration without weight RS232/RS485 parameter setting: RS232 Communicatio Including: ID no., baud rate, data format, n parameter communication protocol, MODBUS Hi-Lo, RS485...
  • Page 23 GM7702 User Manual parameter parameter control parameter setting setting working mode To set analog output mode min. output The value is displayed if value analog is below this value. zero point Analog value when weight Can be set Analog output value value is zero.
  • Page 24 GM7702 User Manual parameter reset serial Reset to factory defaults. port parameter reset all Reset to factory defaults.(except analog parameters parameters) password Password protection of all parameters or change password. language Language version change. (Chinese / English) automatic lock The indicator will lock screen automatically if screen there are not any operation during set time.

  • Page 25: Data Input

    GM7702 User Manual compile Version compiles information display. information test Light on to check whether any damage on the screen or indicator light. 3.2 Data Input Change or input of parameters value could be proceeding through 4 function keys. Change of parameters: TARE—Upturn, MODE—Downturn, Enter—Confirm.
  • Page 26 GM7702 User Manual ENTER—confirm. Press ENTER to 3. Zero tracking time select parameter 4. Stable range Press MODE change input position Press TARE to adjust input position. 3. Zero tracking time Press ENTER to 4. Stable range save setting. - 21 -...

  • Page 27: Calibration

    GM7702 User Manual 4. Calibration 4.1 Description GM7702 indicator should proceed calibrated if the parameters can’t meet users’ requirement. Calibration can fix zero point and gain voltage. User can make record of calibration parameter value, which could be used in calibration without weight.

  • Page 28: Calibration Without Weight

    GM7702 User Manual weight value 2 material. weight value 3 weight value 4 zero calibration Proceeding empty scale Calibration without gain voltage calibration calibration and weight calibration weight if urgent. gain weight calibration 4.2.1 Empty Scale Calibration To set empty scale as zero point...
  • Page 29 GM7702 User Manual 4.2.2 Weight Calibration In order to meet the demands of multiple weight standards, user could set parameters of weight point 1, weight point 2, weight point 3, weight point 4, which are helpful to calibrate gain weight.
  • Page 30 GM7702 User Manual Pressing MODE key could shift set point Input weight value position. Press OPTION key could edit value. Pressing ENTER to complete calibration. Weight: 1.000kg Calibration completed. Voltage: 1.000mV 4.2.3 Calibration without Weight There is a certain error available for calibration without weight. If in urgent condition, please follow below operations.

  • Page 31: Calibration Record

    GM7702 User Manual Press gain voltage calibration to enter manually interface, then 00.000 Gain voltage input the calibration with weight calibration record and press ENTER to complete. Press gain weight calibration to enter manually interface, then 00.000 Gain weight input the gain voltage calibration...
  • Page 32 GM7702 User Manual - 27 -...

  • Page 33: Control Parameter

    GM7702 User Manual 5 Control Parameter GM7702 has equipped with controlling external ON/OFF state parameters .controlling mode: upper/lower limit mode and set point mode. Controlling parameters: Mode Parameters Description output stable initial value: ON judgment Whether limit output proceeded when stable.
  • Page 34 GM7702 User Manual set point 4 min. duration initial value: 0；Range: 0-99.9S； comparing initial value: greater than or equal conditions to. Option: greater than or equal to, less than or equal to, in the range or out of range. ※ The indicator...
  • Page 35 GM7702 User Manual Load weight meter output: Before the weight is stable, the external switch quantity maintains the state before the weight change; when the weight is stable, if the current weight is greater than 1000, the output port 1 is valid. In the effective 2S time, if the weight is reduced to 800 in stable, the output port 1 will continue to remain valid for 2 seconds , and the output port 2 will be valid.

  • Page 36: O Module

    GM7702 User Manual 6 I/O Module 6.1 I/O Module Define GM7702 has equipped with 2 input ports and 3 output ports and could be defined freely. I/O module parameters Parameter Define item Description 0: no definition When the input port is defined as the...

  • Page 37: I/O Module Test

    GM7702 User Manual 6: set point 4 output 7: upper limit 8: middle limit 9: lower limit 6.2 I/O Module Test The purpose of I/O module test is to check whether the connection is correct. I/O module test parameters Parameter...

  • Page 38: Password Management

    GM7702 User Manual 7. Password Management Password function can protect indicator parameters and could be edit in system information parameter. Password must set ON and input correct password when enter. Initial password: 000000. Parameter Description option: ON, OFF. User has to input password if set ON.

  • Page 39: Serial Port Communication

    GM7702 User Manual 8. Serial Port Communication GM7702 has optional RS232 or RS485 to connect with computer. It supports r-Cont protocol, r-SP1 protocol, Modbus-RTU protocol, Chi mei PT650D protocol. 8.1 r-Cont Mode Indicator will transfer data to computer automatically. ID no.

  • Page 40: Modbus Protocol

    GM7702 User Manual —— 1 byte, 0AH For example, Indicator is showing below data: 02 30 31 31 40 41 20 20 20 37 30 30 32 34 0D 0A Means present status: gross weight, stable, positive value, weight value is 700.

  • Page 41: Modbus Address

    GM7702 User Manual Exception code response Code Definition Description illegal data address It means the data address received is illegal. illegal data The data wrote in is illegal. indicator fault Indicator fault when operation. invalid Order received is invalid. 8.2.1 Modbus Address PLC addr.
  • Page 42 GM7702 User Manual D8: stable millivolt D9: net weight D10:beat state, 0-1 alternate switch, 40004 0003 gross weight value 40005 0004 40006 0005 net weight value 40007 0006 40008 0007 tare value 40009 0008 40010 0009 c tare current weight (floating-point data)
  • Page 43 GM7702 User Manual D2: overflow when zeroing D3: zero calibration is unstable. D4: zero voltage is too high. D5: zero voltage is too low. D6: gain voltage is unstable. D7: gain voltage is too large. D8: gain voltage is too low.
  • Page 44 GM7702 User Manual 40026 0025 zero calibration with weight: write non-zero data and calibrate zero point with present weight value, read absolute millivolt 40027 0026 of present load cell 40028 0027 gain point 1 calibration with weight, 0≤weight value≤max. capacity...
  • Page 45 GM7702 User Manual 40051 0050 auto-zero when power-up ON/OFF(0: OFF, 1: ON) 40052 0051 zero point tracking range (0-9d) 40053 0052 zero point tracking time (0-9.9s) 40054 0053 stable range (1-99d) 40055 0054 stable time (0-9.9s) 40056 0055 zero range (0%-99%)
  • Page 46 GM7702 User Manual 40068-40070 0067-0069 Reserved (allow to read value: 0) 40071 0070 whether judge stable before output (0: OFF, 1: ON) 40072 0071 min. duration (0-99.9s) upper limit & 40073 0072 lower limit upper limit value (0-99999) mode 40074...
  • Page 47 GM7702 User Manual 40093 0092 preset point 2 comparison condition (0: greater or equal to, 1: smaller or equal to, 2: within the range, 3: outside the range) 40094 0093 preset point2, preset value 1 40095 0094 40096 0095 preset point 2, preset value 2...
  • Page 48 GM7702 User Manual 40114 0113 preset point 4, preset value 1 40115 0114 40116 0115 preset point 4, preset value 2 40117 0116 40118-40120 0117-0119 Reserved (allow to read value: 0) 40121 0120 IN-1 define 40122 0121 IN-2 define If write 2 in address 0120 (IN-1),...
  • Page 49 GM7702 User Manual 40155 0154 OUT-1 status 2: invalid-status 40156 0155 OUT-2 status 40157 0156 OUT-3 status 40158 0157 preset point 1 status 40159 0158 preset point 2 status 40160 0159 preset point 3 status 40161 0160 preset point 4 status...
  • Page 50 GM7702 User Manual 00014 0013 preset point 1 status 00015 0014 preset point 2 status 00016 0015 preset point 3 status 00021 0020 preset point 4 status 00022 0021 upper limit status 00023 0022 middle limit status 00024 0023 lower limit status...
  • Page 51 GM7702 User Manual 0x7F4F464C（lower 3bytes are O,F,L） bit0：0 Unstable/1 Stable bit1：0 Normal /1 OFL 40003 0002 bit2：0 None Zero/1 Zero Status bit3：0 positive/1Negative bit4：0 AD Normal /1 AD wrong 40004 0003 bit5~bit31：0（standby） 40005 0004 The reserved bit data is fixed as...
  • Page 52 GM7702 User Manual 40012 0011 0x7F+'R'+'E'+'V' 40013 0012 The reserved bit data is fixed as Reserved 0x7F+'R'+'E'+'V' 40014 0013 40015 0014 The reserved bit data is fixed as Reserved 0x7F+'R'+'E'+'V' 40016 0015 40017 0016 Weight value Current Weight Value 40018...
  • Page 53 GM7702 User Manual 40023 0022 The reserved bit data is fixed as Reserved 0x7F+'R'+'E'+'V' 40024 0023 Symbol： bit0：0 Unstable/1 Stable 40025 0024 bit1：0 Normal /1 OFL bit2：0 None Zero/1 Zero Status bit bit3：0 positive/1Negative 40026 0025 bit4：0 AD Normal /1 AD wrong Bit5~bit31：0（standby）...
  • Page 54 GM7702 User Manual 40105 0104 zero tracking time 40106 0105 zero range 40107 0106 unit 40108 0107 decimal point digit 40109 0108 division Four byte read/write region（Supported function code：03, 16） 40201 0200 Max. capacity write range≤division×100000 40202 0201 Write non - zero value pair for zero...
  • Page 55 GM7702 User Manual calibration.The number of millivolts calibration 40206 0205 (signed) read out as relative zero (for complement, fixed 3 decimal points) The number of millivolts written to the 40207 0206 No weight zero zero position.Read as the current zero...
  • Page 56 GM7702 User Manual 00303 0302 0：Non-zero；1：zero Zero marker Positive and 00304 0303 0：Positive；1：Negative Negative marker 00305 0304 AD wrong marker 0：AD Normal ；1：AD Wrong Byte read/write（Supported function code：01, 05） Write operation: write 1, zero calibration;Write 0, no operationRead 00401 0400...
  • Page 57 GM7702 User Manual Write operation: write 1, zero calibration;Write 0, no operationRead 00405 0404 Zero operation: read as 1, the device is in zero stateRead as 0, the device is in a non-zero state 00406 0405 00407 0406 00408 0407...
  • Page 58 GM7702 User Manual Write operation: write 1, low byte mode Write 0, high byte mode Read Modbus Hi-Lo byte 00415 0414 operation: read as 1, currently in low mode selection byte modeRead 0, currently in high byte mode 8.4 Chi mei PT650D Protocol Protocol descriptions as follow: Protocol choose PT650D，data frame format adjusted to7-E-1，Baud rate adjusted to 9600.
  • Page 59 GM7702 User Manual No.1，2——Status 1： OL：overload；ST：stable display；US：unstable display No.3——“， ”2C（HEX) No.4，5——Status 2： NT：Net Weight；GS：Gross Weight No.6——“， ”2C（HEX) No.7—— “+” ：positive； “-” ：negative No.8-14——weight value： if no decimal point， output a space at No.8； overflow state readout value is 999999 No.15-16——Unit：g，kg, t, lb No.17-18——control code：CRLF...
  • Page 60 GM7702 User Manual 9 Dimension - 55 -...

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