Optima Scale OP-902 User Manual

OP-902 INDICATOR

USER’S MANUAL

optimascale.com

TABLE OF CONTENTS

Safety Precautions 1

Preparations and Set Up 1

Features 2

Specications 3

Power Supply 4

Displays 5

Display and Key Descriptions 6

Operating Instructions 7

Calibration 9

Indicator Parameter Settings 11

Connectors 16

RS232 Serial Output Format 18

4-20 mA Analog Output 22

Relay Output 23

Troubleshooting 24

Q&A 25

Contact Us 26

SAFETY PRECAUTIONS

For safe operation of the weighing indicator, please follow these
instructions:

● Calibration inspection and maintenance of the indicator are prohibited by non-pro-
fessional staff

● Please ensure that the indicator rests on a stable surface

● The indicator is a piece of static sensitive equipment; Please cut off power during
electrical connections

● Touching the internal components by hand is prohibited

● DO NOT exceed the rated load limit of the unit

● DO NOT step on the unit

● DO NOT jump on the scale

● DO NOT use this product if any of the components are cracked

● DO NOT use for purposes other then weight taking

● To avoid damaging the battery do not keep charger plugged in once battery is fully
charged

● Make sure the weight is not over the Max capacity as it could damage the load cell
inside

● Material that has a static electric charge could inuence the weighing. Discharge
the static electricity of the samples, if possible. Another
solution to the problem is to wipe both sides of the pan and the top of the case with
an anti-static agent

Please take anti-static prevention measures

Any accumulated charge on the body of the human operator should be discharged rst
before opening the protective container with ESDS devices inside. The discharge can

be accomplished by:

● Putting a hand on a grounded surface or, ideally, by wearing a grounded Anti-static

Wrist Strap and an Anti-static Mat

PREPARATION & SET UP

● Plug into a wall outlet to avoid interference with other wirings

● Turn on the balance while there is no load

● We suggest to warm-up the balance by powering on 5 minutes before use for
accurate weighing

● Calibration may be required before weighing when the balance is initially installed
or moved from a location

1

FEATURES

● Smooth indicator shape with steady performance PCB board, is suitable for
industrial or commercial use

● Multiple weighing units: (lb/oz/kg)

● Gross/Tare/Zero

● Low power design, longer battery usage time

● Hold function, locks the weight

● Idle mode and automatic power off function

● Low-battery detection and warning

● 6 digits 0.7” tall LCD display with backlight

● Splash proof keyboard and display

● RS232 Output

● Print to an optima scale ticket printer

● Stainless steel wall mount bracket included

TECHNICAL PARAMETERS

● Accuracy class: OIML III, n=3000e

● Tare range: 2%~100% max. capacity

● Initial zero range: ±10% max. capacity

● Manual zero range: ±2% max. capacity

● Resolution - Display: Up to 1/15,000 Display Resolution

● Operation temperature: -10 °C ~ +40 °C

● Operation humidity: ≤90%RH

● Storage temperature: -40 °C ~ +70 °C (32-104°F)

POWER SUPPLY

● The indicator uses 3 AAA batteries which will work for about 30 hours with the
backlight turned on, if you turn off the backlight the battery can last up to 100
hours

● This low battery icon will display when the indicator detects low battery, if not
replaced in time the indicator will power off automatically

● If you are using the included DC power supply, the indicator will not use battery
power

● Plug the adapter directly into the “DC” pin located at the back of the indicator. We
recommend to plug into a wall outlet to avoid interference with other wirings

2

DISPLAY AND KEY DESCRIPTION

KEY Weighing Mode Parameter Setting
ON/OFF Powers the Indicator On or Off if held for 2 seconds Exit
HOLD 1. Peak hold - Grabs the highest weight

2. Data hold - Holds the current weight value

3. Auto hold

Conrm

ZERO Zero’s the scale

Tare’s the scale

UNITS Shifts between weighing units (kg/lb) Move Down

DISPLAY Meaning

The scale is at zero

The scale is stable

Gross Shows you are in Gross weight mode; default mode
Net Shows you are in Net weight mode (without tared weight)
hold Shows you are in Hold mode
lb The weight is shown in pounds
oz The weight is shown in ounces
kg The weight is shown in kilograms

Low battery

Move Left

3

OPERATING INSTRUCTIONS

Powering On or Off

● Press ON/OFF key for 1 second to power on. Machine will self inspect and count
from

● Press ON/OFF key for 1 second to power off

● Indicator will auto power off when it has low battery

● Auto power-off in 10/20/60 minutes with no operation can be set in the parameters

1 - 9

Zero/Tare

● The zero function is used only when the scale is empty and is not at gross zero due
to material build up

● If the weight on the scale is within the zero range (2% of the max. capacity) and
stable and ZERO is pressed, the indicator will zero the scale and stay in gross
weighing mode

● The Tare function is used when you only wish to see the current change in weight,
not the entire amount of weight that is on the scale

● If the scale is out of the zero range (above 2% of the max. capacity) and
stable the indicator will Tare the scale and go into Net weighing mode when ZERO
is pressed

before entering weighing mode and displaying 0

Print

● To print press and hold the UNITS key when weighing is stable

● Communication Setting must be set to #2 for Print mode

4

Hold

There are ve different hold functions, you can choose the best option for you and set it
the parameter settings

1. Peak Hold: Grabs the highest weight (for materials testing, ie. tension and pulling

force)

● Press the HOLD key then add weight to the scale

● The indicator will show the highest weight it recorded and hold it on the screen until
a higher weight is placed on the scale

2. Manual Hold: Grabs the current weight and holds it so it will not change/uctuate

● While weighing, press HOLD and the indicator will hold the current weight on the
screen until HOLD is pressed again

3. Auto Hold: If the weight on the scale is above 20d and is stable, the indicator will
hold that weight on the screen for 3 seconds then go back to general weighing

● Pressing the hold key is unnecessary, holding is done automatically when the scale
is stable

4. Average Hold: Used for animal weighing, the indicator will display the average

weight sampled from 1-9 seconds (Set in the

● Add animal to scale and press HOLD

● Indicator screen will show “
from those seconds

● Press HOLD again to exit holding mode

5. Auto Average Hold: Used for animal weighing, the indicator will display the aver-

age weight sampled from 1-9 seconds without the need to press the HOLD key.

If the weight on the scale is above 20d (scales division x 20) and is stable, the indica-

tor will start grabbing the average weight sampled from 1-9 seconds (Set in the HAt:
parameter setting). In parameter
1-9 seconds. This is the time you have to load the animal before the scale begins to
take the average weight.

● Add animal to scale. Once weight is added to the scale, the scale will wait the set
loading time and then the Indicator screen will show “

● It will then display the average weight from those 1-9 seconds for 3 seconds and
then repeat the process

LOC

” for 1-9 seconds, then display the average weight

Hadt

HAt

you can set a determined loading time from

parameter setting)

LOC

” for 1-9 seconds

5

CALIBRATION

To Enter Calibration Settings

● Turn indicator off. Then press and hold the HOLD and UNIT key simultaneously
while the indicator is turning on (Do this while indicator is counting down)

● The display will show [

● Press UNIT if you want to change the unit to lb; Display will change to [

● Press HOLD to conrm your unit choice

● The display will most likely show [
(see tables below for other variances)

● Press UNIT to change the capacity range to your scales capacity

Calibration chart for kilogram usage:

Display Max. Capacity Division Calibration Loading Weight

FS 0 15.00kg 0.005kg 10kg

FS 1 30.00kg 0.01kg 25kg

FS 2 60.00kg 0.02kg 50kg

FS 3 100.00kg 0.02kg 75kg

FS 4 150.00kg 0.05kg 100kg

FS 5 200.00kg 0.05kg 150kg

FS 6 custom custom custom

CAL

kg], meaning the unit is kg

FS 5

], meaning the max. capacity is 200kg,

CAL

lb].

Calibration chart for pound usage:

Display Max. Capacity Division Calibration Loading Weight

FS 0 33.00lb 0.01lb 22.05lb

FS 1 66.00lb 0.02lb 55.12lb

FS 2 132.00lb 0.05lb 110.25lb

FS 3 220.00lb 0.05lb 165.35lb

FS 4 330.0lb 0.1lb 220.5lb

FS 5 440.0lb 0.1lb 330.7lb

FS 6 custom custom custom

6

CALIBRATION cont.

If FS = 6

Please follow the procedure below:

● The display will show [
press UNIT to change, and press HOLD to conrm (ex. DP 2 = ####.##)

● The display will show [
press HOLD to conrm

● The display will show [
display the current max. capacity; press ZERO to left shift and UNIT to change the
capacity; Then press HOLD to conrm

● The display will show [
HOLD to display the current calibration loading weight; press ZERO to left shift and

UNIT to change the calibration loading weight; Then press HOLD to conrm

● The display will show [
complete calibration

dP 1

d 2

CAP

LoAd

CALon

], to indicate how many decimal places you want;

], to indicate the division; press UNIT to change, and

], to indicate the max. capacity; press HOLD to

], to indicate the calibration loading weight; press

] please follow the steps for FS values of 0-6 to

For FS values of 0 - 6

Please follow the procedure below:

● The display will show [
press ON/OFF to exit calibration

● The display will show [
on scale, then press HOLD to conrm and zero calibrate

● The display will show [
as dened by the tables above on the scale

● Once the weighing platform is stable, press HOLD to conrm and calibrate

● The display will show [

save the weight calibration and press ON/OFF to exit and go back to weighing mode

CALon

noLoAd

AdLoAd

CALEnd

], press HOLD to enter into weight calibraion, or

] for zero calibration; make sure there is no load

] for loading calibration; place calibration weight

] when the calibration is complete, press HOLD to

7

PARAMETER SETTINGS

KEY Function

● Press HOLD and UNIT together to enter the
parameter settings

● Use the following diagram to navigate through
the parameter settings:

Function Display Parameter Settings

Automatic
Power Off

Power Saving Mode

Unit Conversion

Hold Function

Hold Time

Average Hold
Sample Time

Loading Time

Zero Range
(% scale is allowed
to zero, anything
after will be tared)

Negative Range
(% it can go nega­tive before an error)

Communication
Setting

OFF 10

BL 1

UnS 1

Hold 1

Ht 1

HAt 1
HAdt 1
2Ero 1

nEgr 1

trn 1

0 = turn off auto power off
10 = power off automatically if no change within 10 minutes
30 = power off automatically if no change within 30 minutes
60 = power off automatically if no change within 60 minutes
90 = power off automatically if no change within 90 minutes

0 = turn off the backlight
1 = backlight only when the weight changes or keyboard is pressed
2 = constant backlight

0 = turn off unit switch function
1 = kg/lb
2 = lb/oz
3 = kg/lb/oz

0 = turn off hold function
1 = Peak hold - Grabs the highest weight
2 = Manual hold - Grabs the current weight
3 = Auto hold - Automatically holds data when stable
4 = Average hold - Averages the weight from a sample of 3 seconds
5 = Auto Average hold - Average hold without pressing HOLD

0 = turn off hold time
1 = 15 second hold time
2 = 30 second hold time
3 = 45 second hold time
4 = 60 second hold time
5 = 90 second hold time

1-9 Seconds = How many seconds sampled for the average weight

1-9 Seconds = How long the scale waits (So you can load the ani-

mal on the scale) until it begins to take the average weight

0 = turn off manually zero setting
1 = Initial zero range ±10% max capacity,

Manual zero range ±2%

2 = Initial zero range ±100% max capacity,

Manual zero range ±100%

0 = -20d negative display
1 = 10% MAX negative display
2 = 100% MAX negative display

Set the serial interface data output method:

0 = Turn off serial interface data output
1 = Continuous sending mode, connect computer
2 = Print mode, connect printer
3 = Command request mode, connect computer

ON/OFF
HOLD
ZERO
UNITS

Exit

Conrm

Move Left
Move Down

8

Function Display Parameter Settings

Baud Rate

bAud 1

1 = 9600bit/s
2 = 4800bit/s
3 = 2400bit/s
4 = 1200bit/s
5 = 600bit/s

9

HELPFUL DEFINITIONS

Division: The amount of increments a scale offers. How accurate the scale can be

Capacity: the maximum amount the scale can contain

Zero Range: % of the max capacity that the scale is allowed to zero, anything above

this percentage number will be tared.

Initial Zero Range: The percentage of weight allowed on the scale when indicator is powered

on that will automatically zero (anything above this percent will be tared).
example: If initial zero range is set to 10% of the max. capacity and your max. capacity is

100lbs, you can place up to 10lbs of weight on the scale and when the indicator is powered on, it

will automatically zero out the weight.

Manual Zero Range: The percentage of weight allowed on the scale where the indicator will let

you manually zero by pressing the ZERO key (anything above this percent will be tared).

Negative Range: How far you can go in the negative direction before displaying an
error code

Baud Rate: The rate at which information is transferred in a communication channel.
example: In the serial port context, “9600 baud” means that the serial port is capable of
transferring a maximum of 9600 bits per second.

TROUBLESHOOTING

Error Reason Solution

UUUUUU

nnnnnnn

ERR1

ERR2

ERR3

ERR4
ERR5

1. Overload

2. Wrong connection with load cell

3. Load cell has quality problem

1. Calibration is no good

2. Wrong connection with load cell

3. Load cell has quality problem

During calibration, weight is not used or

the weight is above the max. capacity

During calibration, the weight is below
the minimum required weight

During calibration, the input signal is
negative

During calibration signal is unstable After the platform is stable, start calibration

EEPROM Error Change PCB

1. Reduce the weight

2. Check load cell connection

3. Inspect load cell; Check the input/output

1. Make sure scale is level

2. Check load cell connection

3. Check load cell input and output resistance
Use correct weight within the dened range

The calibration weight minimum is 10% of

the max. capacity set in C04.
Recommended to use 60%-80% of max.

capacity if possible

1. Check all wire connections

2. Check load cell

3. Recalibrate

4. PCB replacement needed if steps 1-3 fail

10

CONNECTORS

Connecting load cells to the indicator

● The indicator can connect with 4 load cells of 350Ω at most. Use the quick
disconnect connector

Quick Disconnect

DB9 Connection (9 pin Serial Connector)

The DB9 9 pin serial connector is used for different purposes depending on the
indicator model

● Figure 4 shows the pin assignment on the DB9 9 pin connector

DB9 SERIAL CONNECTOR PINOUT

DB9 Pin Description

DB9 Pin Denition Function

2 TXT Transmit Data

3 RXD Receive Data

5 GND Ground Interface

11

COMMUNICATION MODES

Continuously send mode: the indicator continuously sends the data to the RS232 port
Manually send mode: Press UNIT for 1 second to send the current data to the RS232

port

Command Send Mode: From a computer send ASCII R character (hexadecimal 52) to

the indicators RS232 port and the indicator will respond with the current data

Communication Format is done using ASCII as shown below:

, , CR LF

{

S 1 S 2 S 3 Data S 4

S1: weight status, ST=standstill, US=not standstill, OL=overload
S2: weight mode, GS=gross mode, NT=net mode
S3: weight of positive and negative, “+” or “-”

Data: weight value, including decimal point

S4: “kg” or “lb”

CR: carriage return

LF: line feed

{

{

Manual Send Mode Print out example:

ST, GS+ 5.12KG

ST = Stable
GS = Gross
+ = Weight is positive

5.12 = Weight
KG = Unit measurement

12

SPECIFICATIONS

2.5”
2”

ON/OFF

HOLD

UNITZERO

8”

4.5”

CONTACT US

Please e-mail [e-mail] for any sales related questions.

Please e-mail [e-mail] for any support related questions.

Don’t forget to visit our website at:

optimascale.com

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