General Measure GM8802C-D User manual

GM8802C-D
User Manual
GM8802C-D110101
48010224231000

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........................................................................100
3 Calibration ..............................................................................................................11
3.1 Descriptions of Calibration..............................................................................61
3.2 Flow Chart of Setting Parameters ..................................................................122
3.3 Millivolt Value Display....................................................................................17
3.4 Calibration with Weight ...................................................................................18
3.5 Calibration without Weight ..............................................................................19
3.6 Serial Ports Calibration Switch......................................................................211
3.7 Log Table for Parameter Calibration 1...........................................................231
3.8 Log Table for Parameter Calibration 2...........................................................233

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
6.1 Zeroing Operation.....................................................................................101
6.2 Inputting Password....................................................................................101
6.3 Setting Password.......................................................................................103
6.4 Recover Initial Settings.............................................................................103
7 Display Test.......................................................................................................107
8 Errors and Alarm Messages...............................................................................108

GM8802C-D Weighing Transmitter
GM8802C-D110101 1
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..
1.1 Functions and Features
Small dimension, handsome appearance, easy to operate.
Applicable to all kinds of resistance strain gauge bridge load cell.
Front panel numerical calibration
Multilevel of digital filter
Automatic zero –tracking
Automatic zeroing when power up
Bothway serial port(RS-232/RS-485)
Calibration via serial interface

GM8802C-DWeighing Transmitter
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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-D Weighing Transmitter
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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.
1.3 Technical Specifications
1.3.1 General Specifications:
Power supply ：DC24V ± 5%
Working temperatures ：-10～40℃
Humidity ：90% R.H without dew
Power ：about 4W
Dimension ：82×92×45（mm）

GM8802C-DWeighing Transmitter
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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：Sigma - Delta
A/D conversion speed：120times/second
Non-linear ：0.01% F.S
Gain drifting ：10PPM/℃
Precision：1/30000
1.3.3 Digital Part：
Display ：6 high light red LEDs
Negative data display ：“-”
Overflow display：“OFL”
Position of decimal point ：5 options
Keypad：4 beep keys

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1.4 Dimensions
Dimension of front panel:
Length
：
82mm
Width
：
92mm
Hight：45mm

GM8802C-DWeighing Transmitter
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2 Installation
2.1 Connection of Power Supply
GM880C-D weighing transmitter uses 24V direct-current power and the connection is
as follows:
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-.
DC+:Positive pole
DC-:Negative pole

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The signal definition of each port of the load cell connector as follows:
Port EX+ SN+ EX- SN- SIG+ SIG- AGI
Connection Excitation+ Sense+ Excitation- Sense- Signal+ Signal-Shield
2.2.1 6-Wired Connection
Load cell