A&D GC Series User manual

GC-3K
GC-6K
GC-15K
GC-30K
1WMPD4004750

Note for Precautions
To prevent accidents due to inappropriate handling, this manual contains the following warning signs
and marks. The meanings of these warning signs and marks are as follows.
Warning Definitions
An imminently hazardous situation that could result in death or serious injury,
if not avoided.
A potentially hazardous situation that could result in death or serious injury,
if not avoided.
A potentially hazardous situation which, if not avoided, may result in personal injury
or property damage.
Symbols Definitions
indicates caution (including warning). A symbol inside the figure shows a specific content
(in the case of the left figure, it is about electrical shock).
indicates prohibition. Specific content is shown in or in terms and illustration near .
In the case of the left figure, it is about “prohibition of disassembly”.
indicates something that must be followed. Specific content is shown in or in terms and
illustration near . In the case of the left figure, it is about “something that must be followed”.
Other
The information that is helpful in using the device
Caution
(1) No parts of this manual may be reproduced without permission. This manual may not be copied, modified, or
translated without the written permission of A&D Company, Limited (hereinafter referred to as A&D). No parts or
all of the contents in this manual may be reproduced without permission.
(2) The contents of this manual are subject to change without notice.
(3) Please contact A&D if you notice any uncertainty, errors, omissions, etc. in this manual.
(4) A&D bears no liability for direct, indirect, special, or consequential damages due to the operation of this product,
the claim of rights by third party, or for data loss, even if advised of the possibility of such damage regardless of
(3) above.
2022 A&D Company, Limited
This manual may be reproduced or revised without permission of A&D. Product names and company names
mentioned in this manual are trademarks or registered trademarks of their respective companies in Japan or other
countries and regions.

3
Contents
1. COMPLIANCE ...............................................................................................................................................5
1.1. Compliance with FCC Rules..................................................................................................................5
2. INTRODUCTION ...........................................................................................................................................5
3. OVERVIEW ...................................................................................................................................................5
4. PRECAUTIONS FOR USE............................................................................................................................6
4.1. Precautions When Installing the Scale ..................................................................................................6
4.2. Precautions When Weighing .................................................................................................................6
4.3. Precautions for Storing ..........................................................................................................................6
5. UNPACKING .................................................................................................................................................7
6. PART NAMES ...............................................................................................................................................8
7. INSTALLATION .......................................................................................................................................... 10
8. BASIC OPERATION................................................................................................................................... 12
8.1. Basic Operation of the Scale ...............................................................................................................12
8.2. Tare Subtraction ..................................................................................................................................13
8.2.1. Set by Weighing a Tare................................................................................................................13
8.2.2. Input a Tare Weight with the Keyboard........................................................................................13
8.2.3. Clear a Tare Weight .....................................................................................................................14
9. COUNTING................................................................................................................................................. 15
9.1. Prepare to Start Counting ....................................................................................................................15
9.2. Back Up the Unit Weight......................................................................................................................16
9.3. Key Restriction Function......................................................................................................................16
9.4. Unit Weight by Sample ........................................................................................................................17
9.5. Unit Weight by Keyboard .....................................................................................................................19
9.6. Unit Weight by ID Number ...................................................................................................................20
9.6.1. Search by ID Number...................................................................................................................21
9.6.2. Search by Item Code ...................................................................................................................22
9.6.3. AIS Function.................................................................................................................................24
10.STORE UNIT WEIGHT .............................................................................................................................. 26
10.1. Storing Unit Weight ..............................................................................................................................26
10.2. Clearing a Stored Unit Weight .............................................................................................................28
10.3. Call Up Unit Weight Together with Tare Weight..................................................................................29
10.4. Call Up Unit Weight Together with Comparator Upper Limit Value and Lower Limit Value................29
10.5. Call Up Unit Weight Together with Comparator Upper Limit Value, Lower Limit Value, and Tare Weight....29
11.TOTAL (M+) FUNCTION............................................................................................................................ 30
11.1. Total (M+) Function..............................................................................................................................30
11.2. Viewing the Total Count.......................................................................................................................31
11.3. Clearing the Total Count......................................................................................................................31
11.4. Subtraction (M-) Function ....................................................................................................................31
11.5. Calling Up Unit Weight and Total Count Together ..............................................................................31
12.COMPARATOR FUNCTION ...................................................................................................................... 32
12.1. Setting the Comparator........................................................................................................................32
12.2. Comparison Relation ...........................................................................................................................33
12.3. Setting Upper Limits and Lower Limits ................................................................................................33

4
13.SENSITIVITY ADJUSTMENT .................................................................................................................... 34
13.1. Preparing for Sensitivity Adjustment....................................................................................................34
13.2. Sensitivity Adjustment Using a Weight ................................................................................................35
13.3. Correcting Gravity Acceleration ...........................................................................................................36
13.4. Initializing Sensitivity Adjustment Value ..............................................................................................36
14.FUNCTIONS............................................................................................................................................... 37
14.1. Function Setting ...................................................................................................................................37
14.2. Function List.........................................................................................................................................38
14.3. Password Lock Function......................................................................................................................45
14.3.1. Password Registration .................................................................................................................45
14.3.2. Function Setting after Password Lock .........................................................................................46
14.3.3. If You Forget Your Password.......................................................................................................47
14.4. Initialization of Function Settings .........................................................................................................47
15.ACAI ........................................................................................................................................................... 48
15.1. ACAI Function......................................................................................................................................48
15.2. Automatic Operation of ACAI...............................................................................................................48
15.3. Manual Operation of ACAI...................................................................................................................49
16.COMMUNICATION SPECIFICATIONS ..................................................................................................... 50
16.1. RS-232C Interface ...............................................................................................................................50
16.2.Communication Mode ..........................................................................................................................51
16.3. Commands...........................................................................................................................................55
16.4. UFC (Universal Flex Coms) Function..................................................................................................62
17.SD............................................................................................................................................................... 65
17.1. Usable Type of SD Card......................................................................................................................65
17.2. Data Format .........................................................................................................................................65
17.3. Inserting SD Card ................................................................................................................................67
17.4. Copying Data .......................................................................................................................................68
18.OPTIONS.................................................................................................................................................... 69
18.1. Options List ..........................................................................................................................................69
18.2. AD-8561...............................................................................................................................................69
18.2.1. Input With Barcode Reader/Keyboard .........................................................................................69
18.2.2. Comparator Relay Output ............................................................................................................69
18.2.3. Interface for Remote Scale ..........................................................................................................70
18.3. Separation of Display/GC-08 ...............................................................................................................72
18.3.1. Separation of Display ...................................................................................................................72
18.3.2. Attachment of GC-08 ...................................................................................................................72
19.MAINTENANCE ......................................................................................................................................... 73
19.1. Repair ..................................................................................................................................................73
19.2. Troubleshooting ...................................................................................................................................73
19.3. Error Display ........................................................................................................................................73
20.SPECIFICATIONS...................................................................................................................................... 75
20.1. Specifications List ................................................................................................................................75
20.2. External Dimensions............................................................................................................................76
20.3. Gravity Acceleration Map.....................................................................................................................77

5
1. Compliance
1.1. Compliance with FCC Rules
Please note that this equipment generates, uses and can radiate radio frequency energy. This equipment has
been tested and has been found to comply with the limits of a Class A computing device pursuant to Subpart
J of Part 15 of FCC rules. These rules are designed to provide reasonable protection against interference
when this equipment is operated in a commercial environment. If this unit is operated in a residential area, it
might cause some interference and under these circumstances the user would be required to take, at his own
expense, whatever measures are necessary to eliminate the interference.
(FCC = Federal Communications Commission in the U.S.A.)
2. Introduction
Thank you for purchasing a GC series counting scale. This manual describes how the GC series counting
scale works. For effective use, read this instruction manual thoroughly before using the product.
3. Overview
This product has the following characteristics.
Counting scales with display resolution 1/6000 to 1/7500.
When counting the number of pieces that have the same weight, the number can be calculated from the
weight (unit weight) of one piece.
Unit weight can be set in various ways as follows.
- Weigh the total weight of samples for which quantity is specified such as five, ten, etc.
- Weigh the total weight of samples for which quantity is arbitrary.
- Input a known unit weight with a keyboard.
- Call up the unit weight that is stored in internal memory or external memory (micro SD card).
- Set externally such as with a computer.
Unit weight can be easily set according to the status of LED blinking.
With ACAI (Automatic Counting Accuracy Improvement), counting with accurate unit weight is possible.
In internal memory, unit weight up to 1000, item code, tare weight, total count, and comparator upper
and lower limits can be stored together with the ID.
For the item code, upper-case/lower-case alphabet and numeric digits are usable.
The M+ function adds the counting results.
The comparator function compares upper and lower limits that have been set with the counted value or
weighed value. The result is shown as LO, OK, and HI (red, green, and yellow).
The display can be separated from the main scale.
For the power, an AC adapter or commercial mobile battery is usable.
With the RS-232C cable or AD-8561 (Multi-Interface), weighing data and counting data can be sent to a
computer.

6
4. Precautions for Use
4.1. Precautions When Installing the Scale
Do not touch the AC adaptor with wet hands. Doing so may cause electric shock.
Do not install the scale in a location where corrosive gas or flammable gas are present.
Do not apply excessive load to the cable.
The scale is heavy. Use caution when lifting, moving and carrying the scale. Do not lift the scale by
holding the display unit or weighing pan. Doing so may cause the product to fall and be damaged. Hold
the bottom side of the base unit when lifting, moving and carrying the scale.
Use the scale indoors. If used outdoors, the scale may be subjected to lightning surges that exceed the
discharge capacity. It may not be able to withstand the energy of the lightning and may be damaged.
Consider the following installation conditions in order to obtain the proper performance.
The ideal conditions for installation are stable temperature and humidity, solid and level surface, location
with no draft or vibration, indoors out of direct sunlight and a stable power supply.
Do not install the scale on a soft floor or where there is vibration.
Do not install the scale in location where breezes or large fluctuations in temperature occur.
Avoid locations in direct sunlight.
Do not install in a location with strong magnetic fields or strong radio signals.
Do not install the scale in a location where static electricity is likely to occur. When humidity is 45% R.H. or less,
plastic and insulating materials are susceptible to being charged with static electricity due to friction, etc.
The scale is not dustproof or waterproof. Install the scale in a location where it will not become wet.
When the AC adapter is connected to an unstable AC power supply, it may malfunction.
Turn on the scale using the ON/OFF key and keep the weighing display on for at least 30 minutes
before use.
4.2. Precautions When Weighing
Do not place a load exceeding the weighing capacity on the weighing pan.
Do not apply shock to or drop anything on the weighing pan.
Do not use a sharp instrument such as a pen to press switches.
Press the ZERO key before each weighing to reduce weighing errors.
Periodically confirm that weighing values are correct.
4.3. Precautions for Storing
Do not disassemble the scale.
Wipe using a soft cloth slightly moistened with a mild detergent when cleaning the scale. Do not use
organic solvents. Using organic solvents such as MEK may cause the display to become so opaque that it
cannot be properly seen.
Prevent water, dust and other foreign materials from getting into the scale.
Do not scrub with a brush or the like.

7
5. Unpacking
The following items are included in the package.
Counting scale Quick start guide AC adapter USB cable (A to C)
Remove the cushions under the weighing pan
(Put the cushions back under the weighing pan when transporting the scale to another place).
Cushions Approximately 1.5m

8
6. Part Names
Weighing pan
Front panel (Refer to the next page)
Power panel
Power input terminal
RS-232C terminal
External input terminal
Leveling feet (Turn so the bubble in the bubble spirit level is in the center.)
Serial number
Grounding terminal
Bubble spirit level
The scale is horizontal.
Weighing will be correct
The scale is tilted.
Weighing will not be correct
Cable panel

9
Front Panel
Remote scale mark.
Mark is displayed when a remote scale is used.
M
+
mark.
Mark is displayed when count data has been accumulated.
PRINT key.
Data is output.
TOTAL key.
The total count is displayed.
M+key.
The count data is added to the total.
Comparator results.
REMOTE SCALE key.
The key switches between the GC and remote scale
Unit weight is light.
The unit weight is too light for accurate counting.
key
Item code is displayed. Or the M
-
key.
ACAI mark
(Automatic Counting Accuracy Improvement).
Mark is displayed when weight is within
the range of ACAI. Mark blinks during
additional ACAI processing and then
disappears.
RESET key.
Any previous operation is cleared.
0 to 9 , key.
Alphanumeric keys, decimal point
Stable mark.
Mark is displayed when the weighing
value is stable.
Net mark.
Mark is displayed when tare weight is
subtracted from gross weight.
C key.
The value input by numeric keys is
cleared.
Zero mark.
Mark is displayed when the weighing
value is at the zero point.
Unit weight display.
ENTER key.
Sample weight, ID and alphanumeric
input values are entered.
Mass display
STORE UNIT WEIGHT key.
Store unit weight, item code and
other data in memory.
ZERO key.
The zero point for the scale is set.
COMP key.
Upper limit value and lower limit
value are displayed.
ON/OFF key.
The display is turned on or off.
SAMPLE key.
Unit weight using samples is entered.
KEYBOARD TARE key.
A known tare weight using the numeric keys is input.
Count display.
TARE key.
Net value that subtracts the tare weight from gross weight is displayed.
ID. key.
Unit weight and other data from memory are recalled.
KEY BOARD key.
Unit weight using numeric keys is entered.

10
7. Installation
1. Adjust the horizontal level of the product using the
four leveling feet and bubble spirit level. Confirm that
the scale is seated firmly and does not rattle (refer to
“4.1. Precautions When Installing the Scale”).
Perform sensitivity adjustment when the scale is installed for the first time or relocated (refer to
“13. Sensitivity Adjustment”).
Ground the scale by using the grounding terminal when it is used where static electricity occurs.
2. Connect the AC adapter to an outlet, and the USB cable to the power input terminal that is on the side of
display.
Performance is not guaranteed if a commercial AC adapter or a USB cable for other products is used.
When using a mobile battery as a power source, it is recommended that you use one where power
can be turned on/off with a switch.
Set function setting to “ ” if the mobile battery has an automatic power-off function
(Operating time will be shortened) (refer to “14. Functions”).
The table below shows the reference values of continuously usable time with mobile batteries
(comparator function being off, no connected devices).
Continuously usable time
5000 mAh
10000 mAh
Approximately 24 hours
Approximately 50 hours
Performance is not guaranteed with all mobile batteries.
Confirm the specifications of mobile batteries before use. Product damage due to mobile batteries
will void the warranty.
Please confirm that the local voltage and the receptacle type are correct for your scale.
Leveling foot
Bubble spirit level
USB cable
AC adapter
Outlet Power input terminal
Grounding terminal
The scale is horizontal. The scale is tilted.
Weighing will be correct Weighing will not be correct

11
The power input terminal cannot perform data communication.
The power input terminal cannot output power.
Do not connect to any device other than a power source, otherwise the product may be damaged.

12
8. Basic Operation
8.1. Basic Operation of the Scale
Press the ON/OFF key to turn the power on.
Press the ON/OFF key again to turn the power off.
Although the display can be turned off with the ON/OFF key,
the internal circuit stays energized.
1. Turn the power on without placing anything on the weighing pan.
2. After all the display indicators turn on, the scale displays zero.
3. If the display does not show zero, press the ZERO key.
If the weighing value does not become stable, “ ”
is shown. Confirm whether there is something touching the
weighing pan, or a strong breeze or vibration can be observed.
Zero-Point Setting
The ZERO key sets a zero point when the weighing value is stable within ± 2% of weighing capacity
based on basing the zero point (power-on zero) when the display turns on. The scale displays zero, and the
zero-point mark lights up.
Tare Subtraction
The TARE key subtracts the weight of substance on the weighing pan as the weight of tare (container)
when the weighing value is stable and more than zero. The scale displays zero, and the net weight mark and
zero-point mark light.
Caution: The weighing range is reduced by the tare weight.
Power-On Zero
When the ON/OFF key is pressed to turn on the display with nothing on the weighing pan, the scale
displays zero together with the zero-point mark lit. The range in which power-on zero is run is less than ±
50% of the weighing capacity for zero with sensitivity adjustment.
Power-On Tare
When the ON/OFF key is pressed to turn on the display with something on the weighing pan, tare
subtraction is run to light the net weight mark and the zero-point mark and to show zero. The range in which
power-on tare subtraction is run is ± 50% or more of the weighing capacity.
*Less than ± 50% of the weighing capacity: Power-on zero (zero-point mark lighting)
*± 50% or more of the weighing capacity: Power-on tare subtraction (net weight and zero-point marks lit)
Near Zero
Near zero is the range within ± 4d in kg (d = minimum display). This range is regarded as the standard for
functions being operated/not operated with comparators, etc.

13
8.2. Tare Subtraction
Tare subtraction is performed when weighing/counting with a tare (container) to subtract the weight of the
tare (container) and display the net value. There are the following two ways to set the tare weight.
- Weigh the actual tare weight to set: Refer to “8.2.1. Set by Weighing a Tare”
- Input the known tare weight with the keyboard Refer to “8.2.2. Input a Tare Weight with the Keyboard”
8.2.1. Set by Weighing a Tare
1. Place a tare (container) alone on the weighing pan and
press the TARE key.
2. The scale displays “-------“. Wait until the weighing value
becomes stable.
3. The scale subtracts the weight of the tare and displays the
net weight. The zero-point mark and the net weight mark
light up.
8.2.2. Input a Tare Weight with the Keyboard
1. Remove everything from the weighing pan. If the display
does not show zero, press the ZERO key to show zero.
2. Press the KEYBOARD TARE key.
The weight display blinks.
3. Use the numeric keys 0 to 9 to input a tare weight.
To correct the value, press the C key and re-enter the
weight.
(The figure to the right shows an example of 615g tare weight.)
4. Press the ENTER key.
The tare weight is subtracted and the scale displays
the net weight. The net weight mark lights up.
The values that are entered with numerical keys are rounded
off to the minimum display of weight. For example, if entering
123 g with the GC-30K, which has minimum display of 5 g,
the tare weight is shown as 125 g.
Tare (container)

14
8.2.3. Clear a Tare Weight
There are the following two ways to clear a tare weight.
Perform a Tare Subtraction at the Zero-Point
1. Remove everything from the weighing pan.
2. Press the TARE key.
The tare weight is cleared and the scale displays zero. The net weight mark disappears.
If the display does not show zero, press the ZERO key to make it show zero.
Input Zero for the Tare Weight
1. Remove everything from the weighing pan.
2. Press the KEYBOARD TARE key. The weight display blinks.
3. Input “0” for the tare weight and press the ENTER key. The tare weight is cleared and the scale
displays zero. The net weight disappears.
If the display does not show zero, press the ZERO key to make it show zero.

15
9. Counting
9.1. Prepare to Start Counting
For counting, the weight per one item (unit weight) needs to be set.
1. Press the ON/OFF key to turn on the display. Or press the RESET key to initialize the previous
operation.
2. Three LED lights in the unit weight panel blink and the unit weight setting is activated. This is the default
status before counting.
3. Choose one of the following options to set the unit weight for counting, or bring up one from the memory.
Press the RESET key to return to the default status above whenever you
suspend the operation or are uncertain about the ongoing operation. This
does not clear the tare weight, total count, upper limit/lower limit of
comparator.
9.4. Unit Weight by Sample
Set with ten samples
Set with the desired number of samples
9.5. Unit Weight by Keyboard
9.6. Unit Weight by ID Number

16
9.2. Back Up the Unit Weight
The unit weight in use is stored in the internal memory. If the unit weight is reset or the power is turned off
accidentally, the memory can be brought up from “ID: 000000” as follows.
1. The three LED lights in the unit weight panel should be blinking.
2. Press the ID. key.
The scale displays “ID: 000000”.
3. Press the ENTER key.
The unit weight that was previously used is called up.
Automatically Call Up the Previous Unit Weight
The unit weight that was previously used can be called up when the display is turned on.
Set function setting to “ ” to enable this function (refer to “14. Functions”).
9.3. Key Restriction Function
This function restricts key operation. If this function is activated, only the keys used for ”9.4. Unit Weight by
Sample” become usable.
Keys usable when the key operation is restricted
Set function setting to “ ” to enable this function (refer to “14. Functions”).
Note that all functions that use keys other than the above are disabled.

17
9.4. Unit Weight by Sample
Setting With Ten Samples
1.
Press the RESET key. The three LED
lights in the unit weight panel
blink. If you use a tare (container), place it on the center of weighing
pan.
2.
Press the SAMPLE key.
The scale automatically performs tare subtraction with a
tare (container) and displays “Add Sample” and “10 pcs.”
If the weight display does not show zero, press the TARE key.
Every time the SAMPLE key is pressed,
the number of samples
to place on the weighing pan changes in the order 5, 25, 50, 100,
10, and back to 5.
The greater the number of samples is, the higher the accuracy of
the unit weight becomes.
3.
Place the number of samples that is shown in the display on the
weighing pan (or put it in a container).
4.
Press the ENTER key. After showing “-------", the scale
displays count, total weight, and unit weight.
If the weight of samples in use is not heavy enough to determine
the unit weight (the total weight of samples is not 10.1 times as
heavy as the minimum display), the scale displays the number of
samples to add together with “Add” (insufficient samples). Add the
number of samples accordingly, and then press the ENTER key.
The unit weight is settable even if the ENTER key is pressed
without additional samples. However, counting accuracy may not
be sufficient.
5. You may begin counting operations using the unit weight entered.
The number of samples
to place on the weighing pan
Sample weight
More samples are
required. Add 15
more samples.
10 samples
Tare (container)
Total weight
Unit weight
Weight per sample
Number of pieces

18
Desired Sample Size
1.
Press the RESET key. The three LED lights in the unit weight panel
blink. If you use a tare (container), place it on the center of weighing pan.
2.
Press the SAMPLE key. The scale automatically performs
tare subtraction operation with a tare (container) and displays
“10pcs” and “Add Sample”.
If the weight display does not show zero, press
the TARE key.
3.
Use the numeric keys 0 to 9 to input the desired
number of samples
(The figure to the right shows an example of 20 samples).
If you pressed the wrong key or want to make corrections,
press the C key.
4.
Place the number of samples input on the weighing
pan (or put it in the container).
5.
Press the ENTER key. After showing “-------",
the scale displays count, total weight, and unit weight.
If the weight of samples in use is not heavy
enough to determine the unit weight (the
total weight of samples is not 10.1 times as
heavy as the minimum display), the scale
displays the number of samples to add
together with “Add” (insufficient samples).
Add the number of samples accordingly,
and press the ENTER key.
The unit weight is settable even if the ENTER key is
pressed without additional samples. However, counting
accuracy may not be sufficient.
6. You may begin counting operations using the unit weight entered.
The number of samples
to place on the weighing pan
20 samples
Sample weight
Unit weight
Weight per sample
Tare (container)
Total weight
Number of pieces

19
9.5. Unit Weight by Keyboard
1. Press the RESET key. The three LED lights in the unit weight panel
blink. If you use a tare (container), place it on the center of the weighing
pan and press the TARE key.
2. Press the KEYBOARD key.
3. Use the numeric keys 0 to 9 to input a known unit weight.
(The figure to the right shows an example of 32 g).
If you pressed the wrong key or want to make corrections,
press the C key.
4. Press the ENTER key. The unit weight input is set.
If the unit weight that has been input is excessively light (less than
minimum countable unit weight), the scale displays “Low Unit
Weight” and returns to Step 3. Input the unit weight again.
5. You may begin counting operations using the unit weight entered.
Tare (container)
Unit weight
Weight
Number of pieces

20
9.6. Unit Weight by ID Number
The following explains how to call up a unit weight that is stored in internal or external memory. Set function
setting to internal memory “ ” or external memory “ ” (refer to “14. Functions”).
- With internal memory, the unit weight needs to be stored in advance (refer to “10.1. Storing Unit Weight”).
- With external memory, a file in the corresponding format must be prepared (refer to “17. SD”).
1. Press the RESET key. The three LED lights in the unit weight panel
blink. If you use a tare (container), place it on the center of weighing pan
to press the TARE key.
2. Press the ID. key. The scale displays “ID: 000000”.
3. ID or item code is selectable as a search key. Also, the AIS function,
which calls up unit weight that is closest to the current weighing value, is
available. Press the ID. key to switch the search key.
- ID search
: Refer to “9.6.1. Search by ID Number”
- Item code search
: Refer to “9.6.2. Search by Item Code”
- AIS function
: Refer to “9.6.3. AIS Function”
Search by ID Search by item code AIS function (manual operation)
Tare (container)