DIGIWEIGH DWP-98 User Manual

DWP-98 Series

Counting scale

User’s Guide

PLEASE READ THIS MANUAL VERY CAREFULLY BEFORE
ATTEMPT TO OPERATE THE INSTRUMENT

Specifications subject to change without prior notice

CONTENTS

1. INSTALLATION

2. SPECIFICATIONS

3. KEYS, DISPLAY AND CONNECTIONS

4. GETTING STARTED

5. INITIAL SETUP

6. INSTRUCTION FOR USE

7. RS232 DATA OUTPUT

8. BATTERY POWER AND RECHARGING

9. ERROR CODES

10. DAILY CARE AND MAINTENANCE

Appendix A: -
About Bi-Directional Communication

INSTALLATION

Because of metrological legislation, installation/some
metrological parameter settings are limited to be done by
authorized personnel only. Do not attempt to change any of the
built-in metrological parameters. Contact your dealer for more
information and technical assistance.

To ensure performance accuracy, do not use the instrument in
where or when the environment condition falls beyond as those
listed on SPECIFICATIONS.

Do not attempt to open the instrument, no user serviceable
parts inside.

Interface

RS232

Stabilisation

time

2 second typical

Operating

temperature

0°C - 40°C / 32°F - 104°F

Power supply

220~240V AC (110V optional) 50/60Hz

built-in rechargeable battery 6V4AH.

Display

3 windows 6 digits 0.8’LCD display.

and 11 status indication

Zero range

0mV~8mV

Housing

ABS housing and Stainless steel pan(230*290mm)

ADC

Σ-Δ

External

Resolution

1/30000; 1/60000

Interface

RS-232 Output

Other function

Real-time clock and units conversion (kg,lb)

Model#

DWP-98CDH

DWP-98CBH

DWP-98CAH

Max Capacity

3kg

15kg

30kg

Readability

0.05g

0.2g

0.5g

1. SPECIFICATIONS

2.1 GENERAL SPECIFICATIONS

DWP-98 Series(resolution 1:60000; unit :kg/lb)

Common Specification

2. KEYS, DISPLAY AND CONNECTIONS

1. UNIT PIECE WEIGHT SET KEY
Press this key to confirm the unit piece weight entered by numeric keys.

2. WEIGHT UNIT KEY

Press this key to shift among various weight units.

3. M+ KEY

Press this key to accumulate the current quantity to memory or to recall the
accumulated total quantity when unloaded.

4. TARE KEY

Press this key to tare off the weight of a container.
Press this key to enter parameter

5. SAMPLE QUANTITY SET KEY

Press this key to confirm the sample size (pieces) entered by numeric keys.

6. CHECK KEY

Press this key to set upper & lower quantity check limit and to trigger the

quantity check mode.
Press this key as next parameter when setting

7. PRINT KEY

Press this key to send print data to a printer.
Press this key as last parameter when setting

8. ZERO KEY

Press this key to set weight displayed to zero when an empty scale has
drifted away from a true zero reading.

9. CE KEY
Press this key to clear value entered.

10. NUMERIC KEYS

Numeric keys 0 ~ 9 and decimal key.

11. BATTERY POWER / LEVEL INDICATOR

This indicator appears to show:-

 The instrument is running on the built-in rechargeable battery,
 It shows the remaining battery level.

12. SPARE

No assignment.

13. ZERO INDICATOR

Visible when instrument at true zero weight status.

14. NET INDICATOR
Visible when tare function is in effect. The weight being shown on Weight
Panel is net weight.

15. STABLE INDICATOR

Visible when weight reading is stable.

16. WEIGHT UNIT INDICATOR

kg = kilogram, g = gram, lb = pound

17. UNIT PIECE WEIGHT INDICATOR

The value left to it is the unit piece weight. This indicator remains visible
during normal operation status.

18. INSUFFICIENT SAMPLE WEIGHT CARNING INDICATOR

Visible when total weight of the sample size is below satisfactory level. If
possible, increase the sample quantity unit this indicator disappears.

19. INSUFFICIENT UNIT PIECE WEIGHT CARNING INDICATOR

Visible when the unit piece weight of the sample is below satisfactory level.
If possible, increase the sample quantity.

20. TOTAL INDICATOR

Visible when total accumulated quantity is being displayed.

21. QUANTITY INDICATOR

The value left to it is the quantity of the current transaction. This indicator
remains visible during normal operation status.

22. QUANTITY CHECK RESULT INDICATORS

 HI = Quantity is higher than the HI limit set.
 OK = Quantity is in between than the low and HI limits set.
 LO = Quantity is lower than the LO limit set.

A. WEIGHT PANEL

Weight value is shown here.

B. UNIT PIECE WEIGHT PANEL

Unit piece weight is shown here.

C. QUANTITY PANEL

Quantity value is shown here.

D. BUBBLE LEVEL

Refer to this bubble to obtain a horizontal position for the instrument.

E. CHARGE STATUS INDICATOR

Red = Recharging battery; Green = Charging completed.

F. ON/OFF KEY
Press this key to turn the instrument on or off.

G. DC JACK INPUT

External power adaptor is plugged in here.

H. RS232 COMPORT

9 pin (DB9) RS232 interface output for connection with computer and other
peripherals.

4. GETTING STARTED

In order to obtain accurate weighing and counting result, the instrument
must be placed on a strong and level surface horizontally.

Avoid using the instrument in environment where excessive wind flow,
vibration and extreme temperature change exist.

The instrument should be installed CA from any sources of excessive
electrical noise. For full EMC or for RFI immunity, termination of cable
shields and correct grounding of the instrument is essential.

General warning: -

 The instrument is not an explosion proof device.
 The instrument is not a water proof device.
 Do not open the instrument, no user serviceable parts inside.

Always contact your dealer for service.

 The instrument not to be subject to shock, excessive vibration

or extremes of temperature (before or after installation).

4.1 BUILT-IN RECHARGEABLE BATTERY

The instrument is equipped with a built-in rechargeable battery. Before first
time use, recharge it for at least 8 hours to ensure the best battery
performance.

4.2 POWER ADAPTOR

Before plugging in the power adaptor, check and make sure the input
voltage of the adaptor matches with output voltage of the electricity outlet. If
not, contact your dealer immediately.

4.3 CONNECTING OTHER DEVICES

AlCAys turn the instrument off before making any connections or
disconnections with external devices.

4.3.1. Connecting with a Computer

RS232 COMPORT

ON INSTRUMENT

COM PORT ON COMPUTER

(DB9)

(DB25)

2 = RXD

3 = TXD

3 = TXD

3 = TXD

2 = RXD

2 = RXD

5 = GND

5 = GND

7 = GND

RS232 COMPORT
ON INSTRUMENT

DB25 COMPORT ON

PRINTER

2 = RXD

3 = TXD

3 = TXD

2 = RXD

5 = GND

7 = GND

4.3.2 Connecting RS232 to Printer (DB25)

5. INITIAL SETUP

5.1 INTERNAL SETTINGS

Preferred application parameters can be checked or set through internal
functions. Refer to 5.4 for internal function description and setting
procedures.

5.2 HOW TO ENTER AND SELECT INTERNAL FUNCTION

Follow the below steps to enter and select desired parameter of an internal
function.

a. Turn the instrument off and on again,
b. Press [TARE] during countdown,

c. The instrument displays F1,
d. The instrument is now in internal function,

5.3 KEY FUNCTION DURING INTERNAL FUNCTION SETTING

 [TARE] = Enter, save and return,
 [ZERO] = Quit without saving,
 [CHECK] = Go next,
 [PRINT] = Go previous,
 [CE] = Clear,

6. INSTRUCTION FOR USE

6.1 POWER ON

Powered on the instrument, instrument displays: -

a. softCAre and revision number and capacity of instrument,
b. calibration count value,
c. parameter set count value,
d. all LCD segments,

Then countdown process starts. After that, the instrument is ready for
operation.

6.2 START WEIGHING

a. If zero weight cannot be obtained when unloaded, press [ZERO]. After

[ZERO] is pressed, Zero Indicator appears. Refer to
SPECIFICATIONS for maximum zero range,

b. AlCAys place an object onto platter gently. Excessive force applied to

platter may cause damages to the weight sensor inside instrument,
c. Weight of the object is displayed on thus unit automatically,
d. It is a good practice to remove all loads from platter after weighing. It

will prolong the life of the weight sensor inside instrument.

6.3 ABOUT WEIGHT UNIT CONVERSION

The instrument supports conversion among weight units. Press [UNIT] to

shift between kg, g and lb.

To enable or disable a particular weight unit, set it ON or OFF respectively

in internal function F9.

The weight unit being employed before power off will be employed when
turned on again.

6.4 TARE OFF THE WEIGHT OF A CONTAINER1

1

2

Tare function is used to temporarily set the instrument to zero (such as
cancelling the weight of a box or a container) in order to get the net weight
result

6.4.1 Enable / Disable Repeat (Multiple) Tare

Depends on internal function setting, repeated (multiple) tare operation may
be enable (Mode 1) or disabled (Mode 2). Contact your dealer for more
information.

When repeat (multiple) tare is enabled: -

1. the instrument will permit multiple tare operations provided that

both of the below requirements are fulfilled: -
 The tare operation does not permit a reduction of the value of

the tare;

 The tare effect can only be cancelled when there is no load on

the platter.

2. tare effect can only be cancelled when container is removed and
gross weight is zero.

6.4.2 Manual Tare2

When a container is used, follow the below steps to tare the weight of the
container off to get a net weight result.

a. Remove all loads from platter,
b. Make sure that the Zero Indicator is on. If not, press [ZERO] to set

weight reading to zero,
c. Place container on platter,
d. Press [TARE],
e. Net Indicator appears to indicate tare is in effect and weight reading

is net weight. Refer to SPECIFICATIONS for maximum tare range,

The tare weight is deducted from the weighing capacity (Max), reducing the

maximum weight that can be displayed.

a. The tare operation does not permit a reduction of the value of the tare;

b. The tare effect can only be cancelled when there is no load on the platter.

f. To cancel tare effect, remove all loads and container from platter and

3

4

press [TARE] ,
g. Net Indicator disappears. Tare effect has been removed and weight

reading is gross weight.

6.4.3 Preset Tare

This feature enables the user to manually enter the tare weight. During
normal operation, enter the pre-determined tare weight through numeric
keys then press [TARE]. This pre-determined tare value will be deducted.

To cancel the preset tare effect, remove all loads from platter then press

[TARE].

NOTE: -

1. Refer to SPECIFICATIONS for maximum tare range.

2. Manual tare is possible when preset tare is in effect. Manual tare

will cancel the effect of preset tare.

6.5 QUANTITY COUNTING

Quantity counting starts with determining the unit piece weight either by
keyboard entry or sampling process.

6.5.1 Entering Unit Piece Weight3 4

This method is used where unit piece weight is known and is highly
standardized.

a. Refer to 6.2 to 6.4 for zero, selecting preferred weight unit and tare

operation,
b. Enter the unit piece weight and press [@WT]. The unit piece weight

is now displayed on the Unit Piece Weight Panel.
c. Place a load on the platter. The weight of the load is displayed on the

Weight Panel and the quantity is displayed on the Quantity Panel.

For best counting result, refer to 2.2 for recommended minimum unit piece weight

and weight applied.

When the individual unit piece weight is not standardized, it is strongly

recommended that counting procedures as described in 6.6 should be employed.

d. To enter new unit piece weight, repeat step b above.

5

6.5.2 Sampling Process
This method is used where unit piece weight is unknown or the weight of
individual piece is not highly standardized.

a. Refer to 6.2 and 6.4 for zero, selecting preferred weight unit and tare

operation,
b. Place a sample size with known quantity on platter
c. Enter the quantity of the sample through the numeric keypad and

confirm by pressing [# SET].
d. The instrument will automatically determine the unit piece weight and

display it on the Unit Piece Weight Panel5.
e. Step by step add more load onto the platter (or remove part of the

load from the platter),
f. The latest Weight, unit piece weight and total quantity would be

displayed on the corresponding panels,
g. To start a new sampling, repeated step a to d above.

6.6 ABOUT AUTO PIECE WEIGHT ENHANCEMENT FUNCTION

In order to obtain the best counting result accuracy, the instrument is
equipped with Auto Unit Piece Weight Enhancement Function. This
function will automatically come into effect when an unit piece weight is
obtained through the sampling method as described in 6.5.2.

6.6.1 How Auto Unit Piece Weight Enhancement Function Works

After a unit piece weight is obtained by methods as described in 6.5.2, then
place more loads onto the platter. The new quantity will be shown on the

Total Count Panel. And at the same time, Auto Unit Piece Weight
Enhancement Function will update the unit piece weight if both below

requirements are fulfilled: -

a. The quantity added to platter is more than 1 piece, and

At this point, sampling process is completed and Auto Piece Weight

Enhancement Function comes into effect.

b. The quantity added to platter is less than 100% of the maximum

6
7
8

9

counts previously attained from the same transaction.

If the above requirements are fulfilled, a new unit piece weight will be
determined and displayed on the Unit Piece Weight Panel and confirmed
by 2 audio beeps.

Auto Unit Piece Weight Enhancement Function will terminate when: -

a. a zero weight is detected or during the transaction process, or
b. quantity added is more than 100% of the maximum counts previously

attained from the same transaction, or
c. quantity removed is not more than 50% of the maximum counts

previously attained from the same transaction.

To start Auto Piece Weight Enhancement Function again after
terminated, repeat 6.5.2.

6.7 MEMORY ACCUMULATION FUNCTION

6.7.1 To Accumulate a Transaction to Memory6 7 8

a. When quantity is being displayed on Quantity Panel, press [M+]9 to

and accumulate data of current transaction to memory,

b. The instrument: -

 displays “ACC” on Weight Panel. ACC denotes data has been

accumulated to memory,

 displays “n” on Unit Piece Weight Panel. n donates the number

of transactions which have been accumulated to memory.

 displays Total Indicator and total accumulated value on

Quantity Panel.

Transaction with zero quantity will not be accumulated.
Transaction with weight less than 20d will not be accumulated.
All data stored will be erased when the instrument is powered off or changing

weight unit.

Unstable weight will not be accumulated to memory. If M+ is pressed when weight

is unstable, the instrument will reject this command and response with 2 beeps.

 output transaction printout(s)10 through the RS232 comport. The

10

11

12

instrument returns to normal operation status after 2 seconds,

c. Repeat a for subsequent transactions11,

6.7.2 Memory Recall and Clearance
a. Remove all loads from platter,
b. Press [M+] to recall total accumulated weight from memory,
c. After [M+] is pressed, the instrument displays: -
d. The instrument displays: -

 “ACC” on Weight Panel.
 “n” on Unit Piece Weight Panel. n donates the number of

transactions which have been accumulated to memory.

 Total Indicator and total accumulated value on Quantity Panel.

e. At this point: -

 Press [ZERO] to quit or,
 Press [CE] to clear memory, then [ZERO] to return to normal

operation status.

6.8 QUANTITY CHECK FUNCTION12

6.8.1 To Enter High and Lo Quantity Limits

The instrument is equipped with quantity check function. Follow the below
steps to trigger checkweighing mode: -

a. During normal operation, press [CHECK].
b. The instrument displays High Limit and current HI limit value is

displayed on Quantity Panel.

c. Press [TARE] to accept or enter a new HI limit through the numeric

keys and then press [TARE] to confirm,

d. The instrument then displays Lo Limit and current LO limit value is

displayed on Quantity Panel.

e. Press [TARE] to accept or enter a new LO limit through the numeric

keys and then press [TARE] to confirm,

The number of copies sent = the number of copy set in internal function F8. Refer

to 5. INITIAL SETUP for more information.

Weight reading must return to or below zero to enable another weight

accumulation.

Quantity check function will not function when weight reading is less than 20d.

Hints: -

1. For normal comparison, set both HI and LO limits,

2. To check only if result is lower or equal to LO (result ≤ LO), set HI
limit = 0,

3. To check only if result is higher or equal to HI (result ≥ HI), set LO
limit = 0,

4. To check if result is equal to a specified value, set both HI limit and
LO limit = the specified value

6.8.2 Visual and Audio Quantity Check Signals

6.8.2.1 Visual signal: - Quantity check result is displayed by one of the
Check Result Indicators located on Quantity Panel.

6.8.2.2. Audio signal: - depends on setting of internal function F5, audio

signal can be triggered when result is = within range, out of
range or turned off.

6.8.3 To Quit Checkweighing Mode

To quit checkweighing mode, set both HI and LO limits to zero.

7. RS232 DATA OUTPUT

DATA BIT

DESCRIPTION

1~2

MOTION STATUS

US = UNSTABLE
ST = STABLE

3

COMMA SEPARATION

4~5

NET/GROSS

NT = NET WEIGHT
GS = GROSS WEIGHT

6

SIGN (Sign of weight reading)
Positive = space. Negative = minus (-)

7~13

WEIGHT VALUE

7-character string containing the current weight including
location of decimal point.

If there is no decimal point, then the first character is a

13

Data output parameters are fixed as below: -

 Data Bit = 8
 Parity = None
 Stop Bit = 1

There are 2 data output modes (PC and Prt) are available13. PC is for
communication with computer and other peripherals which accepts and
processes continuous data communication. Prt (printer) is for transmission
to printer or other peripherals which accept only single or manual data
transmission.

Baud rate has to be set before proceeding to other settings.

7.1 PC (COMPUTER) MODE

Weight status and data are sent under the PC (Computer) Mode). Data is
transmitted in ASCII code. Data format is listed on below table.

Refer to 5. INITIAL SETUP for setting information

space.

14

COMMA SEPARATION

15~16

UNIT
kg = kilogram
g_= gram (_ = blank space)
lb = pound

17

Cr

18

LF

14

15

7.2 PRT (PRINTER) MODE

7.2.1 Printing Current Transaction

A standard printout as will be sent through the RS232 Comport when
[PRINT]14 is pressed. Refer to Standard Printout Sample on next page

for description.

Number of copies sent = the number of copy set in internal function F8.
Refer to 5 INITIAL SETUP for more information. If extra copies are needed,
press [PRINT] again.

7.2.2 Printing the Totalized Accumulated Result

Follow the below steps for to print the totalized accumulated result: -

a. Remove all loads from platter,
b. If zero weight reading cannot be obtained when unloaded, press

[ZERO]

c. Press [M+] then followed by [PRINT], The below data and format

will be sent15,

Refer to Totalized Accumulated Printout Sample on next page for
description.

Pressing [PRINT] will not accumulate transaction to memory. Press [M+] to

trigger memory accumulation and print function simultaneously

The number of copies sent = the number of copy set in internal function F8. Refer
to 5. INITIAL SETUP for more information. If extra copies are needed, press [PRINT]
again.

Standard Printout Sample Description

16

TIME 12:08:57
DATE 07.08.2010
No. 0
TARE 2.000kg
GROSS 6.000kg
NET 4.000kg
UNIT WT. 0.5 g
Q'ty PCS

HIGH 5000PCS
LOW 4500PCS
HIGHER THAN LIMIT

TIME 13:48:23
DATE 07.08.2010
No. 4
TOTAL 14997PCS

Totalized Accumulated Printout Sample Description

8. BATTERY POWER AND RECHARGING

Remaining battery power of the built-in rechargeable battery is displayed on
the Battery Power / Level Indicator.

When this transaction is accumulated to memory.

**

Visible when quantity check function is in effect.

1. Time of printing,

2. Date of printing,

3. M+ sequent number16

4. Tare Weight,

5. Gross Weight,

6. Net weight,

7. Unit piece weight,

8. Quantity,

9. One blank line,

10. One blank line,

11. HI limit set**

12. LO limit set**

13. Quantity Check result**

1. Time of printing,

2. Date of printing,

3. Total No. of transaction

4. Total accumulated quantity

8.1 SYMBOLS AND REMAINING POWER: -

Error

Code No.

Description

Full Battery: ≥ 6.3V
2 Blocks: ≥6.0V
1Block: ≥5.7V
Frame only: ＜5.7V

8.2 BATTERY OPERATION TIME

Depends on the battery condition, a fully charge new rechargeable battery
will usually give: -

 Around 200 hours of continuous operation without backlight, or
 Around 70 hours of continuous operation with backlight on, or

8.3 RECHARGE BATTERY

When appears, (when battery is less than 5.7V), it means the
built-in rechargeable battery is at low voltage status. It is recommended to
recharge immediately.

To protect the built-in rechargeable battery, the instrument will power off
automatically when battery voltage is at extremely low level (when battery is
at around 5.4V). Do not attempt to power the instrument on. Recharge the
instrument immediately. Fail in doing so may cause unrecoverable damage
to the built-in rechargeable battery.

Battery charging status is shown on the dual color Charge Status Indicator:

-

 Red: - Recharging in process,
 Green: - Charging is completed.

Battery recharge is possible while instrument is in operation. Overcharge
protection circuit is built inside to prevent battery damages caused by
overcharge.

Heat will be generated during recharging and it is normal to feel minor heat
at front panel of the instrument.

9. ERROR CODES

Err 1

Time value error

Err 2

Date value error

Err 3

Exceed maximum manual zero range

Err 4

Offset out of range / unstable during power on

Err 5

No load cell signal detected

Err 6

Tare operation error

Err 7

Logic error. HI limit set is lower than LO limit
(and HI is not = 0)

Err 8

Logic error. LO limit is higher than HI limit
(and HI is not = 0)

--oL--

Overload (Gross weight is more than Max plus 9d)

UndEr

Under load (Gross weight is less than minus 20d)

10. DAILY CARE AND MAINTENANCE

 Clean the instrument with a soft, damp cloth. If necessary, use a mild

detergent in CAter,

 Do not use any harsh, abrasive material, acetone, volatile solvent,

thinner or alcohol for cleaning,

 Verify the accuracy of this unit periodically. Re-calibrate this unit if

necessary. In some countries, calibration requires authorized /
qualified agent. Contact your dealer for more information,

 Store this unit in a dry and clean place,
 Recharge battery before and every 2 months during long time

storage.

Appendix A: -

About Bi-Directional Communication

Key on Instrument Panel

Equivalent to

Computer Command

1

1

2

2

3 3 4 4 5 5 6

6

7 7 8

8

9 9 0

0

.

(Decimal)

.

(Decimal)

ZERO

A

TARE

B

# SET

C

CHECK

D

CE

E

@WT

F

PRINT

G

UNIT

H

M+

I

Computer commands can be sent to this instrument through any standard
communication program like Hyper Terminal which comes with Windows
2000 and Windows XP.

Equivalent commands from computer are illustrated on below table for each
of the key on panel.

Appendix B: -

Calibration

Turn on the scale and press/hold the tare key for 4 sec then
Let go and it will display F1, with the “Print” button go to F10 Cal
Press “Tare “ to enter ,show “P----”; the initial pass ward is 1234 .
(“Alarm” for next parameter; ”Print” for last parameter )
Press “Tare “ to enter to

“P1 Cap” (capacity : 3kg,5kg,6kg,10kg,15kg,20kg,30kg)
“”P2 Inc” (1,2)
“P3 Zero track ” (off, 0.25, 0.5, 1, 1.5 , 2.0)
“P4 Auto zero” (off,1,2,4,5,10,20)”
“P5 key zero” (off,1,2,4,5,10,20)”
“P6 Filter” (1,2,3,4)
“P7 G1” gravity
“P8 G2” gravity
“P9 User Cal” user calibration, Press “tare” to enter
“Cal unit “ : choose kg, lb as calibration unit

Press “tare” to enter, it show “unload”. Clear platform ,press”Tare”
Show “000000”, enter weight value with numeric keys. Add weight
Press “tare” to show “Ld1 ” ; when “stab” on, press “Tare ”to succeed
calibration

“P9 linear Cal” Press “tare” to enter “Cal unit “ :

choose kg, lb as calibration unit
Press “tare” to enter, it show “unload”. Clear platform , press ”Tare”
Show “000000”, enter weight value with numeric keys. Add weight
Press “tare” to show “Ld1 ” ;
when “stab” on, enter, it show “unload”. Clear platform , press ”Tare”
Show “000000”, enter weight value with numeric keys. Add weight

Press “tare” to show “Ld2” ;

“P11 Pin” pass ward setting ; press” tare ” to show “P1----’;

Enter pass ward with numeric keys
Press “tare” to show “P2----’
Enter pass ward again with numeric keys
Press “Tare” to done the linear calibration

“P12 tare cont” ,press “tare” to enter “mode 1” or “mode 2”
“P13 Cal count”, press “tare to choose “pin” or “Jumper” way to enter

calibration mode