General Measure M02 User Manual

Model no.: M02

Use r ’s Man u a l

M02-00150101

48011201231000

110609010008

©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.

Website: http://www.szgmt.com.cn

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....................................................................................... 7

2.4 Optional Expansion Board Output.................................................. 8

2.4.1 Analog Output (Optional)）................................................. 8

2.4.2 Serial Interface RS485 Output..........................................11

2.4.3 Serial Interface RS232 Output

.........................................

12

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........................................ 28

4.4 Set point parameters

......................................................................

31

5 I/O Definition

.................................................................................................

33

5.1 I/O Definition

....................................................................................

33

5.2 I/O testing......................................................................................... 35

6 Serial Communication................................................................................. 36

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

6.7.1 Modbus Communication Address

....................................

53

7 Password Input and Setting, Reset

..........................................................

60

7.1 Password Input

................................................................................

60

7.2 Password Setting............................................................................ 60

7.3 Factory Reset.................................................................................. 62

8 Display Testing............................................................................................. 64

9 Errors and Alarm Messages

.......................................................................

65

10 Dimension of Indicator

..............................................................................

66

6.4 Cb920................................................................................................49

6.5 rECont............................................................................................... 50

6.6 rEREAD

6.7 Modbus............................................................................................. 52

............................................................................................

51

M02 Digital Indicator

1

 Small volume, unique design, easy operation

 Applicable to all kinds of resistance strain gauge bridge load cell

 Front panel numerical calibration

 Multilevel of digital filter

 Automatic zero -tracking

 Automatically zero when powered on

 4 set points

 1 input and 2 outputs

 Serial communication interface:RS232 or RS485

 Calibration via serial interface

 Optional interfaces: Analog output, serial interface

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. .

1.1 Functions and Characteristics

M02 Digital Indicator

2

 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

 HOLD: Light on when indicator displays the value of D/A output.

1.2 Front Panel

M02 Front panel

Main Display:6 digits, for displaying weight and the information of parameters.
Status Indicator Lamp:

detecting during motion detecting time.

Keypad:

3

: Zero/Esc, Used to exit from current operation or go previous.

1.3.1 Common:

: 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.

: Confirming Key. Used to confirm present operation.

1.3 Technical Specifications

Power supply: DC24V±5%
Working temperature: -10～40℃
Max humidity: 90%R.H without dew
Power consumption: About 10W
Dimension: 105×89×57（mm）

M02 Digital Indicator

4

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
Gain drift: 10PPM/℃
Display Precision: 1/100,000

1.3.3 Digital:

Weight display: 6 digits red high-brightness LED
Minus display: “-”
Overload display: “OFL”
Decimal point: 5 kinds (optional)
Function keys: 4 keys soniferous keypad

M02 Digital Indicator

M02 Digital Indicator

5

2 Installation and Wiring

2.1 Connection of Power Supply

M02 weighing indicator connects DC24V power supply as follows:

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-.
The signal definition of each port of the load cell connector is as follows:

EX+: Excitation+ EX-: Excitation- SN+: Sense+ SN-: Sense- SIG+: Signal+ SIG-: Signal-

6

6 wires

EX+

SN+

EX-

SN-

SIG+

SIG-

Shield

4 wires

EX+

EX-

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.

3. For more load cells parallel connection, their sensitivity (mV/V) should be same.

M02 Digital Indicator

7

2.3 I/O terminals

I/O tolerant definition as follows:

Output

Input

OUT1

Stable

IN1

Reset

all

OUT2

OFL

Indicator input terminal connection:

Indicator input terminal connection:

M02 Digital Indicator

M02 Digital Indicator

8

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.

The definition of analog output as below:

9

Analog output two types:

The definition of analog output:

V+: voltage-output+, V-: voltage-output-
I+: current-output +, I-: current-output -

Note: only support calibration under current

mode. 4 points must be finished for current

calibration.

SET UP

Normal display status

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.

The analog output has been calibrated before the delivery of the indicators, so
users do not need to make calibration. If analog output is abnormal, users can
calibrate by themselves as follows:（Suggestion: please calibrate under the
instruction of professionals)

M02 Digital Indicator

10

Current calibration interface

In this interface，the
multimeter measured
should be 4.000mA.

Measured 4.000mA

If not,press

If yes,press

In this interface，the
multimeter measured
should be 4.000mA.

This interface is current DA

D/A,press to adjust the value,
and the current value measured will
vary accordingly.To adjust it when the
measured value to be 4.000mA, then

press to save and exit.

Then press to calibrate

12.000mA.

Finish the calibration referring to the process of

4.000mA calibration, and the same for the
calibrationof 20mA.

M02 Digital Indicator

and

11

In the interface of highest point calibration,press to enter into analog

This interface is the highest
point calibration of analog
output.

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.

Note: Analog output calibration, highest point must be calibrated.

2.4.2 Serial Interface RS485 Output

Serial Interface RS485 output is optional, please refer to chapter 6.0 for

communication protocol.

RS485 serial interface connection:

M02 Digital Indicator

12

M02 Digital Indicator

2.4.3 Serial Interface RS232 output (Optional)

RS232 serial interface connection:

13

M02 Digital Indicator

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.

（2）If you want to set only one parameter, please press to save parameter’s

value and then press to exit.

（3）Please see section 3.7 for parameters’ instruction.

（4）Please record each value in the blank table in section 3.4 during calibration for the

emergency use in future.

（5）See chapter 9 for error alarm message that may be displayed during calibration.

14

3.2 Flow Chart of Calibration

Normal Status

Password input

Decimal point

2. After password is input, the indicator will

display CALON for one second, then go to

next step.

3. Press to select a desired value for

decimal point among 0,

0.0, 0.00, 0.000 and 0.0000, and then

press to save it and enter next step.

If there’s no need to change the value,

press directly to enter next step.

1. Under this status, press (twice),

indicator will display CAL, then

press to enter password input.

M02 Digital Indicator

15

Min. divistion

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.
If there’s no need to change the value, then

press directly to enter next step.

Max. capacity

5. Input max. capacity(≤min. division×100000),

press to save it and enter next step.
If there’s no need to change the value, then

press directly to enter next step.

Millivolt value display

6. Under this status, press to enter zero

calibration.
Display value near the output value in millivolt
between SIG+/SIG- of load cell.
See section 3.3 for details about this function.

M02 Digital Indicator

16

7.Unloaded scale first, when STAB lamp is on,

press to finish zero calibration.
If there’s no need to calibrate zero,

press directly to enter gain calibration.

Zero calibration

M02 Digital Indicator

17

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.

18

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.
If there’s no need to set password,

press directly to go back to normal
status.

M02 Digital Indicator

M02 Digital Indicator

19

the linearity of load cell is

bad.

*NOTE: You must use

to zero display data before weight is

loaded for each time.

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.

(2)If display value is OFL (or –OFL), it means that loaded weight on load cells is
too large (or too small). Please unload the weight (or load more), if display value is still
OFL (or –OFL), the possible reasons are as follows:

a. There is something wrong with weighing mechanism, please check and clear.

b. The connection of load cell is incorrect, please check and clear.

c. Load cells may be damaged, please replace.

2. Position-error Test for Weighing Mechanism

Load a same weight on each corner of weighing mechanism and record
displayed millivolt value respectively. If differences among these values are obvious,
please adjust weighing mechanism.

3. Linearity Test for Load Cell

Load same weight for several times, and record displayed value every time. If
one or two values are obviously much larger or smaller than any others, it means that

20

Zero millivolt

value(mV)

Gain millivolt

value(mV)

Loaded

Weight

Date

Remarks

1

2

3

4

5

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.

3.5 Millivolt Calibration

When it is not convenient to load a weight to calibrate ，alibration can be done without

weights using recorded data in the table in section 3.4.

However, this method is just used for some emergencies, it will make calibration

result incorrect if load cells, or indicator has been replaced.

21

M02 Digital Indicator

22

M02 Digital Indicator

23

3.6 Calibration Switch for Communication Interface

Symbol

Parameter

Types

Value of parameter

Default

Pt

Decimal Point

5

0 0.0 0.00 0.000 0.0000

0

1d

Min. Division

6

1 2 5 10 20 50

1

CP

Max. Capacity

≤Min. Division×100000

10000

t

Millivolt Value

o

Zero

C

Gain

SIOCAL

Switch for

Calibration

via serial

interface

OFF

PASS

Password Setting

000000

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

M02 Digital Indicator

24

Log Table for Calibration Parameters

Parameter

Calibrated Value

Date

Remarks

Decimal Point

Min. Division

Max. Capacity

Load cell sensitivity

Password

M02 Digital Indicator

25

4 Working Parameters Setting

Normal Status

SET UP

F1

F1.1

F1.7

If F4.1(Password Switch) is ON, you

should input password first.

1 .Use to select between the same level. Switch from

display F1 to F2, press .

4.1 Flow Chart of Working Parameters Setting

M02 Digital Indicator

26

F2

F3

F2.1

F2.7

F3.1

F3.2

2 .Press to enter into sub-selection, press to
return back to previous menu.

When it displays F2,press to enter into F2.1.

F4

F4.1

M02 Digital Indicator

27

Confirm change

OFF

F1.1

ON

F1.1

50

F1.4

50

60

F1.4

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.

Selection:

Enter setting status Change OFF to ON Confirm the change

Data:

Enter setting status Move the flashing from 0 to 5 Adjust value

28

4.3 Descriptions of Operation Parameters

Code

Default

Description

F1

Null

The first major term of working parameter.

F1.1

OFF

Switch for Auto-Zeroing when power-on,
OFF: disabled ON: enabled

F1.2

0

Zero-tracking Range（0～9d optional）.
This parameter is for automatic calibration, disabled
when is set ”0”.

F1.3

1

Motion Detecting Range（1～9d optional)

F1.4

50

Zeroing Range（00%～99% of Maximum capacity）

F1.55Digital filtering parameter: (1-9 as optional)

0: without filtering
9: strongest digital filtering

F1.6

0

Stable filter parameter （the second filter based on the
first filter）: (1-9 as optional)
0: without filtering

9: strongest digital filtering

F1.70A/D conversion rate: 120,480,960,15,30,60 as optional

M02 Digital Indicator

29

F2

Null

The second major term of working parameter.

F2.101Scale no., indicator no.

F2.2

9600

Baud rate of serial port:1200 / 2400 / 4800 / 9600 /
19200 / 38400 / 57600

F2.3

Cb920

Serial ports communication mode:

Modbus-RTU：MODBUS RTU mode;
r-Cont:SP1 continuous mode;
r-SP1: SP1 command mode；
tt:TOLEDOcontinuous mode；
Cb920：Cb920 continuous mode。
rE-Cont:rE continuous mode；
rE- rEAd:rEcommand mode；

F2.4

7-E-1

Data format:
7-E-1：7 data bits，even parity check，1 stop bit；
7-O-1：7data bits，odd parity check，1 stop bit；
8-E-1：8 data bits，even parity check，1 stop bit；
8-O-1：8 data bits，odd parity check，1 stop bit；
8-n-1：8 data bits，no parity check，1 stop bit；
8-n-2：8 data bits，no parity check，2 stop bit；

M02 Digital Indicator

30

F2.5

HiLo

MODBUS dual-byte register storage turn ， Hi Lo ：

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

F2.7

0

tt(TOLEDOcontinuous mode)If send the checksum。
0：not send, 1：send.

F3

Null

The third major term of working parameter.

(For analog output only)

F3.1

0-5

Analog output:
4-20：4-20mA
0-20：0-20mA
0-24：0-24mA
0-5: 0-5V
0-10: 0-10V
I_out：Current customized
V_out：Voltage customized
In customized mode,F3.2-F3.5 parameters available

F3.2

3920

Minimum output

F3.3

4000

Zero point output

M02 Digital Indicator

31

F3.4

20000

Maximum capacity output

F3.5

20020

Maximum output

F4

Null

The fourth major term of working parameter.

F4.1

OFF

Parameters password setting switch.

F4.2

000000

Parameters password setting:Valid when F4.1 is ON

4.4 Set point parameters

Code

Default

Description

P1-P4

Null

The first term of working parameters

PX.1

OFF

Change of state if need stable

PX.2

0.0

Change of state minimum duration

PX.3

P1.3=1

P2.3=5

P3.3=0

P4.3=0

Condition of validity：
0：forbid；
1：<；
2：<=；
3：==；
4：>=；
5：>；

M02 Digital Indicator

32

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.

PX.4

0

Set value 1（ Set value 1 and set value 2, choose the

minimum to compare）

PX.50Set value 2

Set point has 4 major terms which are user defined.

M02 Digital Indicator

33

5 I/O Definition

Output

Code

Definition

Description

O0

None

No definition

O1

Stable

Effective output in stable status.

O2

Overflow

Effective output when overflow.

O3

Sp1

Effective output when set point 1 status output.

O4

Sp2

Effective output when set point 2 status output.

O5

Sp3

Effective output when set point 3 status output.

O6

Sp4

Effective output when set point 4 status output.

5.1 I/O Definition

Output/Input code table:

M02 Digital Indicator

34

Input

Code

Definition

Description

I0

None

No definition

I1

Zeroing

Effective input for zeroing, pulse input signals

I2

Sp1

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.

I3

Sp2

If this signal is valid, Sp2 status will be regarded as

invalid. Output valid state when comparision condition

turns to invalid, and be effective again.

I4

Sp3

If this signal is valid, Sp3 status will be regarded as

invalid. Output valid state when comparision condition

turns to invalid, and be effective again.

I5

Sp4

If this signal is valid, Sp4 status will be regarded as

invalid. Output valid state when comparision condition

turns to invalid, and be effective again.

M02 Digital Indicator

35

I6

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.

M02 Digital Indicator

36

※Under main display（display weight value), long press to enter into serial

communication checking interface, it will display ‘------’ if no communication, and ‘------’

will flash if there’s communication.

STX

Scale

no.

Channel

no.

Status

Value

CRCCRLF

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.

6.1 r-Cont

Indicator will send weighing data to host computer without command.

Data Format:

Here:

STX —— 1bit，start character 02H
Scale no. —— 2bits，00~99
Status —— 2bits，high byte:40H；low byte definition as follows:

37

D6D5D4D3D2D1D0

Null

Null

G./N.

weight

+/-

Zero
point

OFL

Stable

100

0：+

1：-

0：

non/zero

1：zero

0：

normal

1：OFL

0：not

stable

1：stable

Operation

code

Para. code

Para. Name

number of character

RWTRead current status

8

Weight Value —— 6 bits；when weight is+（-）overflow,return to“space space OFL

space”

CRC —— 2 bits,check sum
CR —— 1 bit，0DH
LF —— 1 bit，0AH

For example:

02 30 31 31 40 4120 20 20 37 30 30 32 34 0D 0A
Means: stable,positive data,present weight 700

6.2 r-SP1

Code : ASCII
Operation code supported: W，write；R, read；C，calibrate；O, zero

6.2.1 Parameters Code Chart

M02 Digital Indicator

38

and weight

RSPRead set point status

4

W

DC

Write mini. Divistion and

max. capacity

8

R/WPTDecimal point digit

1

RDDMinimum division

2

RCPMaximum capacity

6

R/WACAuto. Zeroing switch

1

R/WTRZero tracking range

1

R/WMRStable range

1

R/WZRZeroing range

2

R/WFLdigital filtering para.

1

R/WVCsteady filtering

1

R/WADAD sample rate

1

RPOSet point output status

4

R/W

P1M~P4M

Set point to judge if

need stability

1

R/W

P1T~P4T

Set point minimum

duration time

3

R/W

P1F~P4F

Set point comparison

condition to judge

1

R/W

P1L~P4L

Set point lower edge

value to judge

6

R/W

P1H~P4H

Set point upper edge

value to judge

6

M02 Digital Indicator

39

RAMAbsolute millivolt

7: D6D5D4D3D2D1D0;
D6:+;D5-D0: corresponding ASCII for 6 digits
millivolt,Decimal point is fixed to 3 digits

RRMRelative zero point on

millivolt

7：D6D5D4D3D2D1D0
D6 ： +/-;D5-D0:corresponding ASCII for 6
digits，Decimal point is fixed to 3 digits

CZYZero calibration with

weight

CZNZero calibration

without weight

6

CGYGain calibration with

weight

6

CGNGain calibration

without weight

12

OCZZero clearing

command

O

P1S~

P4S

Setting the

corresponding set

point

Valid when 9,command valid when external
trigger and 1 status change for 1 external
Trigger

O

P1C~P4CClear the

corresponding set

point

R

ID

Read ID No.

6

M02 Digital Indicator

40

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）

STX

Scale no.

Channel No.

RWTCRCCRLF

STX

Scale
no.

Channel
No.

RWTStatus

Value

CRCCRLF

STX

Scale

no.

Channel
No.

RWTE

Error code

CRCCRLF

Here：

M02 Digital Indicator

6.2.2 Error Code Explanation

6.2.3 Command

Indicator will send weighing data to host computer after received command.

6.2.3.1 Host computer read present status

Send command:

Correct response:

Wrong response:

41

D6D5D4D3D2D1D0

Null

Null

G./N.

weight

+/-

Zero point

OFL

Stable

100

0：+

1：-

0：non/zero

1：zero

0：normal

1：OFL

0：not stable

1：stable

STX

Scale no.

Channel No.

R

Para. code

CRCCRLF

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:

Weight Value —— 6 bits ； when weight is+ （ - ）overflow,return to“space space OFL
space”
For example:

02 30 31 31 52 57 54 30 31 0D 0A
Correct response ： 02 30 31 31 52 57 54 40 4130 30 33 37 35 33 33 36 0D 0A

（stablepresent value 3753）
Wrong response: 02 30 31 31 52 57 54 45 31 31 39 0D 0A（CRC check error）

6.2.3.2 Read other parameters

Send command:

42

STX

Scale no.

Channel No.

R

Para. code

Value

CRCCRLF

STX

Scale

no.

Channel
No.

R

Para.

code

E

Error code

CRCCRLF

Here:

STX

Scale
no.

Channel
No.

WDCDivision

value

Max.
capacity

CRCCRLF

STX

Scale no.

Channel No.

WDCOKCRCCRLF

STX

Scale

Channel

WDCE

Error code

CRCCRLF

M02 Digital Indicator

Correct response:

Wrong response:

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）
Wrong response:02 30 31 31 53 4D 52 45 32 30 39 0D 0A（Operation code error）

6.2.3.3 Write max. Capacity and min. Division

Send command:

Correct response:

Wrong response:

43

no.

No.

STX

Scale
no.

Channel
No.

W

Para.
code

Para.
value

CRCCRLF

STX

Scale
no.

Channel
No.

W

Para.
code

OKCRCCRLF

STX

Scale

Channel

W

Para.EError

CRCCRLF

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
capacity 10000)
Correct response: 02 30 31 31 57 44 43 4F 4B 32 34 0D 0A
Wrong response: 02 30 31 31 57 44 43 45 35 39 32 0D 0A（Operation can’t execute）

6.2.3.4 Write other parameters

Send command:

Correct response:

Wrong response:

44

no.

No.

code

code

STX

Scale no.

Channel No.

CZYCRCCRLF

STX

Scale no.

Channel No.

CZYOKCRCCRLF

STX

Scale no.

Channel No.

CZYE

Error code

CRCCRLF

M02 Digital Indicator

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）

6.2.3.5 Calibration Zero

1）Calibrate zero as per current weight（with weight）

Send command:

Correct response:

Wrong response:

Here:

Z——1 bit，5AH

Y——1 bit，59H

For example:

02 30 31 31 435A 59 39 34 0D 0A

Correct response:02 30 31 31 43 5A 59 4F 4B 34 38 0D 0A
Wrong response:02 30 31 34 43 5A 59 45 36 32 30 0D 0A（channel no. error）

2）Input millivolt calibration zero in the chart（without weight）

45

STX

Scale no.

Channel No.

CZNZero millivolt value

CRCCRLF

STX

Scale no.

Channel No.

CZNOKCRCCRLF

STX

Scale no.

Channel No.

CZNE

Error code

CRCCRLF

STX

Scale no.

Channel No.

CGYWeight value

CRCCRLF

STX

Scale no.

Channel No.

CGYOKCRCCRLF

STX

Scale no.

Channel No.

CGYE

Error code

CRCCRLF

M02 Digital Indicator

Send command:

Correct response:

Wrong response:

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）

6.2.3.6 Gain calibration

1）With weights

Send command:

Correct response：

Wrong response:

46

STX

Scale no.

Channel No.

CGNGain millivolt

Weight value

CRCCRLF

STX

Scale no.

Channel No.

CGNOKCRCCRLF

STX

Scale no.

Channel No.

CGNE

Error code

CRCCRLF

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. error）

2）Without weights

Send command:

Correct response:

Wrong response:

Here:

Gain millivolt——6 bits

Weight value——6bits
For example:
02 30 31 3143 47 4E 30 30 31 39 34 30 30 30 30 32 30 30 35 36 0D 0A (Write in:
weight value 200，corresponding gain millivolt 0.194）
Correct response: 02 30 31 31 43 47 4E 4F 4B 31 38 0D 0A
Wrong response: 02 30 31 31 43 48 4E 45 33 38 35 0D 0A（Para. Code error）

47

STX

Scale no.

Channel No.

OCZCRCCRLF

STX

Scale no.

Channel No.

OCZOKCRCCRLF

STX

Scale no.

Channel No.

OCZE

Error code

CRCCRLF

023031314F435A38340D0

A

M02 Digital Indicator

6.2.3.7 Zeroing

Send command:

Correct response:

Wrong response:

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）

6.2.3.8 CRC computation

All the values in front of the parity bit add together and convert to decimal data,
then convert the last 2 bits to ASCII code (decade in front and the unit at the back).

For example

The following is a frame of data:

Add 02~5A: 180(Hex),convert to decimal data: 384. We can calculate from this

48

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:

1234567891011121314151617

18

STX

0D

Here:start character is standard ASII start character 02(STX)

D00101

0

D11100

1

D20011

0

Decimal point

x.x.xx

.xxx

.xxxx

M02 Digital Indicator

that the check code is 38,34 for the data frame.

6.3 tt TOLEDO Protocol

︸ A B C display weight(6 bits) 6 个 30H Checksum

status byte A definition as below:

D3 D4 D6 为 0(not change) D5 is 1(not change)

49

D6D5D4D3D2D1D0

Status

Stable

Overflow

symbol

G.W.

Is 0

(not change)

Is 1

(not change)

Is 1

(not change)

1-unstable

0-stable

1-overflow

0-normal

1-negative

0-positive

Is 0

(not change)

When F2.3=Cb920 in working parameter, indicator will send weighing data

continuously without command under Cb920 protocol.

Status，G.W.

0/1

Symbol

Display

UnitCRLF

Here：

Status —— 2 bits，OL：( 4FH 4CH ) OFL；ST：( 53H 54H )Stable；US：( 55H

53H )unstable

M02 Digital Indicator

status byte B definition as below:

status byte C is reserved, output 20H.

6.4 Cb920

Data format：

50

，—— 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）

CR —— 1 bit，0DH

LF —— 1 bit，0AH

For example: When indicator send the following automatically:

53 54 2C 47 53 31 2B 20 20 31 39 30 2E 31 20 20 0D 0A

Means: Stable、G.W.、Data value is positive、current weight is 190.1

Indicator will send weighing data to the upper computer continuously without any

command.

Return data frame format specification：

Status，GS，+/-

Display

UnitCRLF

M02 Digital Indicator

6.5 rECont

51

2bits

2C

47 53

2C

2B/2D

7bits

6B 67

0D

0A

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

Indicator will send weighing data to the upper computer under command.

Data format：

DataREADCRLF

explain

52H

45H

41H

44H

0DH

0AH

The return data frame is the same with that of rECont protocol, please refer to rECont.

M02 Digital Indicator

Here:

6.6 rEREAD

1) Zero clearing command: ZERO ON<CR><LF> : 5A 45 52 4F 20 4F 4E 0D 0A

Return YES<CR><LF> or NO? <CR><LF>

52

2) Calibration zeroing command: TARE ON<CR><LF> : 54 41 52 45 20 4F 4E 0D 0A

Function code

Definition

Description

03

read the register

06

preset single register

16

preset several registers

Command only support preset double registers.

01

read coil

The length unit is bit.

05

write coil

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.

6.7 Modbus

Indicator uses RTU mode to communicate, every 8-bit byte of the message are
divided into 2pcs of 4-bit hexadecimal characters to transmit at binary code.

Code: Binary

Function code:

Exception code response

M02 Digital Indicator

53

Code

Definition

Description

02

Illegal data address

Data address received from error code is not allowed

03

Illegal data value

Data wrote in is not in permissible range

04

machine fault

When indicator is trying to execuate operation required,

unrecoverable error is produced.

07

Unsuccessful
programming
request

Command received can’t be execuated under current
condition.

6.7.1 Modbus communication address

PLC addr.

Display
addr.

Description

The following items are only-read register(code 0x03)

40001

0000

Present weight value(4bits including sign characters, the
high bit is in the front)

40002

0001

40003

0002

D15—D14..D5—D4 — D3—— D2 ——D1——D0

All is 0 0:+ 0:non-zero 0:normal 0:unstable

1:- 1: zero 1:OFL 1:stable

40004
……
40006

0003
……
0005

Reserve(permit to read, reading value is 0 )

M02 Digital Indicator

54

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）

40010

0009

Stable range（1-9d）

40011

0010

Zeroing range（0%-99%）

40012

0011

Digit filter parameters(0-9)

40013

0012

Stability filter series(0-9)

40014

0013

AD sample rate：0:15/s 1:30/s 2:60/s 3：120 /s
4:480/s 5:960/s

40015~
40018

0014~
0017

Reserved

40019

0018

Decimal point place（0:0bit,1:1bit,2:2bits,3:3bits,4:4bits）

40020

0019

Minimum division（1/ 2/ 5/ 10/ 20/ 50）

The following items are available to read and write

(writing code 0x10，read code 0x03）

40021

0020

Maximum capacity（max.capacity≤mini.division×100000）

40022

0021

M02 Digital Indicator

55

40023

0022

Zero calibration with weights: write in 1 and calibrate zero
with the current weight.
Read: Absolute millivolt of current load cell

40024

0023

40025

0024

Zero calibration without weights: Write millivolt value at
zero；Write in range（load cell 3mV/V:millivolt value range
within 0.02-12.000mV) millivolt value at zero when read.

40026

0025

40027

0026

Gain calibration with weights. Write weight value(≤max.
capacity). Return millvolt at present weight value when
read

40028

0027

40029

0028

Gain calibration without weights ； input gain millivolt(load
cell 3mV/V:0.000 ＜ millivolt<15.000mV － zero
millivolt).Read: millivolt value for gain calibration.

40030

0029

40031

0030

Gain calibration weight without weights. input gain
millivolt(≤max. capacity) Read: weight value for gain
calibration.

40032

0031

40033~40040

0032~0039

reserved

40041

0040

Set point 1 stable or not（0：no；1：yes）

40042

0041

Set point 1 min. duration time（0-999 : 0-99.9sec.）

40043

0042

Set point 1 valid condition

40044~40045

0043~0044

Set point 1 set value 1

M02 Digital Indicator

56

40046~40047

0045~0046

Set point 1 set value2

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

40053~40054

0052~0053

Set point 2 set value2

40055

0054

Set point 3 stable or not（0：no；1：yes）

40056

0055

Set point 3 min. duration time（0-999 : 0-99.9sec.）

40057

0056

Set point 3 valid condition

40058~40059

0057~0058

Set point 3 set value 1

40060~40061

0059~0060

Set point 3 set value 2

40062

0061

Set point 4 stable or not（0：no；1：yes）

40063

0062

Set point 4 min. duration time（0-999 : 0-99.9sec.）

40064

0063

Set point 4 valid condition

40065~40066

0064~0065

Set point 4 set value 1

40067~40068

0066~0067

Set point 4 set value 2

40069

0068

Output 1 user-defined

40070

0069

Output 2 user-defined

40071

0070

Input 1 user-defined

M02 Digital Indicator

57

40072

0071

I/O output value

Note: available only when coil address
00016 is valid.
Input write 1 valid，0 invalid.

Read 1 valid，0 invalid

40073

0072

I/O input value

Reserved

40401

0400

Current weight value( 4 bytes with symbolic number,
high digit in front)

40402

0401

40403

0402

D15—D14……D4 0
D3 0:+ 1:­D2 0:non-zero 1:zero
D1 0:normal 1:OFL
D0 0:Stable 1:Unstable

40404

0403

0

40405

0404

6 digits without symbolic number, user ID no.
40406

0405

The following items are bit read only. （read code: 0x03）

49001

9000

Version no.

If display10024 ，formatXX XXXX,main
version no., hardware no., software
no..So main version no.01 ， hardware
no. 00，software no. 24

49002

9001

M02 Digital Indicator

58

49003

9002

Develop time

If display 141024, means 24thOct.,

2014

49004

9003

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：-

00005

0004

Reserved

00006

0005

Reserved

The following item are available to read and write

（read code：0x01，writing code： 0x05）

00007

0006

Automatically zeroing when power on（0：OFF； 1：ON）

00008

0007

Reserved

00009

0008

Reserved

00010

0009

Reset all

00011

0010

Reset calibration

00012

0011

Reset paramaters

00013

0012

Reset I/O

M02 Digital Indicator

59

00014

0013

Reserved

00015

0014

Reserved

00016

0015

I/O testing switch

00017

0016

Set point 1 status

Only read：
0:invalid，1:valid

00018

0017

Set point 2 status

00019

0018

Set point 3 status

00020

0019

Set point 4 status

00021~
00032

0020~
0031

Reserved

M02 Digital Indicator

60

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.

Note:

（1）When input password, if first time wrong, it will go to the second chance for

password input(display from turn to ).

（2）If second input wrong, it will enter into interface for inputting password the third

time

(Display change from to ).

（3 ） If Input wrong for three times, main display show “Error4” and self-lock, but user

can operate when power on again.

7.2 Password Setting

（1）User can set password in parameters when F4.1 is“ON”.

61

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.

62

7.3 Factory Reset

In working status,

press 1 time to display

SET UP.

Normal working status

SET UP

Press and the
same time to display‘PASS’,
then password input.

PASS

0----

Password input interface, input
fixed password 880202, then

press save password
and enter parameter reset.

880202

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:

M02 Digital Indicator

63

1 ） In F SEt interface, press to reset working
parameters, enter into reset calibration paramters
interface.

2）In F SEt interface, press ，not to make working
parameter reset, enter into calibration para. Reset
interface.

F SEt

F

F

1） In F CAL interface, press to reset calibration
para., enter into reset all interface.

2 ） In F CAL interface, press ， not to make
calibration para. reset, enter into reset all interface.

1）In F ALL interface, press to make reset all of
the paramters （ including working para., calibration
para., I/O etc..

Note: In all reset interfaces, press to exit and return to weighing
interface.

M02 Digital Indicator

64

8 Display Testing

The following flow chart is to test lights on main-display and status lights.

Normal weighing status

SEtUP

tESt

Press 5 times

8.8.8.8

Under parameter interface,

press to switch
to“tESt”interface.

Under“tESt”interface,press

to make display testing,
Nixie tube display and indicator
lights all shine. Now if

press , display will
sparkle.

After testing is finished,

press to return
to“tESt”interface.

tESt

M02 Digital Indicator

65

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.

OFL Weighing value is positive overflow.

-OFL Weighing value is negative overflow.

66

10 Dimension of Indicator

Dimension of rear panel:92×45(mm)

Dimension of front panel:105×57(mm)

Panel cutout dimension:93×46(mm)

M02 Digital Indicator