(Revised) Communication Manual

GX-A Series / GF-A Series Communication Manual
En Ver. 1.01
GX-A Series/GF-A Series Communication Manual 1 / 41

Table of Contents
1. Introduction …………………………………………………………………………………………………. 3
1-1. Applicable models ……………………………………………………………………………. 3
1-2. Features of the communication function………………………………………………….………. 3
2. Interface specifications………………………………………………………………………………………. 4
2-1. RS-232C ……………………………………………………………………………………………….. 4
2-2. USB ……………………………………………………………………………………………………. 5
3. Connection diagrams………………………………………,,………………………………………………. 6
3-1. Connecting the balance to the printer ……………………………………………………………. 6
3-2. Connecting the balance to the external display unit……………………………………………. 6
3-3. Connecting the balance to a PC or a PLC………………………………………………………… 7
4. Connecting to the printer …………………………………………………………………………………. 10
5. Connecting to the external display unit ………………………………,……………………………….. 11
6.Connecting to a PC or a PLC ………………………………………………,…………………………….. 12
6-1. Quick USB mode ………………………………………………………………………………. 12
6-2. Virtual COM mode ……………………………………………………,…………………………… 12
6-3. RS-232C ……………………………………………………………………………………………… 13
6-4. Data transmission software WinCT……………………………………………………….……… 13
7. Data output………………………………………………………………………,………………………….. 14
7-1. Data output mode…………………………………………………………………………………… 14
7-2. Weighing data format …………………………………………………………………………… 16
7-3. Output examples of weighing data format …………………………………………………….. 19
7-4. Other data formats ………………………………………………………………………… 20
8. Commands …………………………………………………………………………………………… 21
8-1. Control commands ………………………………………………………………………………… 21
8-2. The <AK> code and error codes ………………………………………………………………. 24
8-3. Command usage examples ….…………………………………………………………………….. 25
9. Error codes ………………………………………………………………………………………………… 30
9-1. Error codes list ………………………………………………………………………………….. 30
10. The UFC function……………………………………………………………..…………………………... 32
10-1.UFC program commands …………………………………………….…………………………… 32
10-2. Examples of creating UFC program commands……………………………………………… 34
11. Internal settings ………………………………………………………………………………………… 35
11-1. How to set…………………………………………………………………………………………… 35
11-2. List of items（communication entries only） ……………………………………………….. 37

1. Introduction
This communication manual is a supplementary instruction manual for connecting the balance to
peripheral devices such as PCs and printers through the use of its communication function.
1-1. Applicable models

Models to which this the contents of this communication manual is applicable are as follows.
□ GX-A Series
GX-1603A, GX-1003A, GX-603A, GX-403A, GX-303A, GX-203A
GX-10002A, GX-6002A, GX-4002A, GX-3002A, GX-2002A
GX-10001A, GX-6001A
□ GF-A Series
GF-1603A, GF-1003A, GF-603A, GF-403A, GF-303A, GF-203A
GF-10002A, GF-6002A, GF-4002A, GF-3002A, GF-2002A
GF-10001A, GF-6001A
1-2. Features of the communication function
□ The RS-232C interface is provided as standard, enabling communication similar to conventional

balances.
□ A USB interface is provided as standard and you can select between a quick USB for inputting
the weighing result directly into the PC software or bidirectional communication using a virtual
COM port.
□ By using the GXA-03: RS-232 C interface isolation type, which is a specialized option, an
RS-232C interface can be added.

2. Interface specifications
2-1. RS-232C
Connector: D-Sub9-pin（male）
Method of transmission: EIA RS-232C
Format of transmission: Asynchronous, two-way, half-duplex transmission
Data transmission rate: 5 times per second（ca. 5.21Hz）, 10times per second（ca. 10.42Hz）、
20 times per second（ca. 20.83Hz）
Linked with the setting value of the internal setting’s display rewrite cycle
Signal format Baud rate 600, 1200, 2400, 4800, 9600, 19200, 38400 bps
Data bits 7 or 8 bits
Parity EVEN、ODD （Data length 7 bits）
NONE （Data length 8 bits）
Stop bits 1 bit
Code ASCII
Format of 1 character
1 -5V ~ -15V
St 0 1 2 3 4 5 6 P Sp
0 +5V ~ +15V
LSB MSB
Start bit Data bits Stop bit
D-Sub9, pin arrangement
Parity bit
Pin No. Signal Direction Meaning, remarks
name
1 - - N.C. (same potential
with SG)
2 RXD Output Transmitted data
3 TXD Input Received data
4 - - N.C.
5 SG - Signal ground
6 DSR Output Data Set Ready
7 RTS Input Request to Send
8 CTS Output Clear to Send
9 - Output N.C. (12V Output) 9 8 7 6
Connection diagram（when connecting to a PC）
Balance（DCE） PC（DTE）
RXD 5 4 3 2 1
RXD
TXD
TXD
RTS
RTS
CTS
CTS Inch screw #4-40UNC
DSR
DSR
SG
SG

2-2. USB
Connector: miniB（female）
Standard: USB 2.0
Device class: HID（Human interface device）：Quick USB
CDC（Communication device class）：Virtual COM
miniB, pin arrangement

Pin No. Signal Direction Meaning, remarks
name
1 VBUS Input Power (connection
confirmation)
2 D- - Data transmission
and reception
3 D+ - Data transmission
and reception
4 ID - N.C.
5 GND - Signal ground
5 4 3 2 1

3. Connection diagrams
It is possible to connect the balance to peripheral devices, PCs, PLCs, etc. by using the RS-232C
connector and the USB miniB connector which are provided as standard with the balance.
3-1. Connecting the balance to a printer
To print the weighing result measured with the balance on paper, connect a specialized balance
printer (e.g. AD-8127 Compact Printer) to the device.
□ Connect the balance with the printer using the RS-232C cable.
For settings when connecting the balance to the printer, refer to section 4, “Connecting to the
printer”.
RS-232C
Balance Printer
3-2. Connecting the balance to an external display unit
When confirming the weighing values or operating the balance with keys remotely, connect the
specialized external display unit to the balance. The specialized external display unit consists of the
external display unit AD-8920A (display only) and the external controller AD-8922A.
□ Connect the balance to the external display unit using the RS - 232C cable.
For settings when connecting the balance and the external display unit, refer to section
5, ”Connecting to the external display unit".
RS-232C
Balance External display unit

□ When connecting the balance to an external display unit and a printer, connect the balance
with the external display unit (external controller AD-8922A only) with a RS-232C cable and
connect the external display unit and the printer with a RS-232C cable.
RS-232C RS-232C
Balance External display unit Printer
3-3. Connecting the balance to a PC or a PLC
When converting the weighing values of the balance into electronic data or when remotely
controlling the balance, connect it to a PC or a PLC.
□ Connect the balance to a PC using a USB or an RS-232C cable.

USB
or
RS-232C
Balance PC
□ Connect the balance to a PLC using a RS-232C cable.
RS-232C
Balance PLC

□ When connecting the balance to a PC and a printer, connect the balance to the PC with a USB
cable and connect the balance to the printer with an RS-232C cable.
USB
RS-232C
PC
Balance
Printer
□ When connecting the balance to a PC and to the external display unit, connect the balance to the
PC with a USB cable and connect the balance to the printer with an RS-232C cable.
USB
RS-232C
PC
Balance
External display unit

□ When connecting the balance with a PLC and the printer or the external display unit, in both
cases you must use RS-232C cables. When the balance is equipped with the GXA–03 special
option (2nd RS-232C cable, insulated type), connect the PLC with a cable to the RS-232C
connector of the GXA-03, and connect the printer or the external indicator unit with a cable to
the standard RS-232C connector of the balance.
RS-232C
（Insulated type）
RS-232C
（Standard）
PLC
Balance + GXA-03
Printer
RS-232C
（Insulated type）
RS-232C
（Standard）
PLC
Balance + GXA-03
External display unit

4. Connecting to the printer
When connecting the printer to the balance for printing measured values, configure the printer and
the balance as follows according to these usage examples.
Internal settings of the printer

Usage example AD-8127
Compact printer
Printing mode settings
When printing values measured by EXT.KEY
the balance with the balance’s PRINT
key or its “Auto-print” mode.
When printing values measured by MANUAL
the balance with the printer’s AUTO
“Printing” key or its timer mode. TIMER
When printing charts with the CHART
printer.
When printing the balance’s DUMP
statistical calculation results.
When printing the balance’s GLP
data output.
□ Refer to the instruction manual of the AD-8127 for how to change internal settings of the
AD-8127 compact printer.
Internal settings of the balance
Usage example Balance Balance Balance
Connection Data output Data format

destination mode
When printing values measured by 1 0, 1, 2, 4, 5 0
the balance with the balance’s PRINT
key or its “Auto-print” mode.
When printing values measured by 1 3, 6 0
the balance with the printer’s
“Printing” key or while in its timer
mode.
When printing charts with the
printer.
When printing the balance’s 1 0, 1, 2, 4, 5, 6 1
statistical calculation results.
When printing the balance’s GLP
data output.

5. Connecting to the external display unit
When connecting the external display unit to the balance, configure the external display unit and
the balance as follows according to these usage examples.
Internal settings of the external display unit and the balance

Usage example AD-8920A AD-8922A Balance
Remote Remote
Display Controller Connection
destination
Output mode
When only displaying the balance’s No setting 0, 1, 2 2
display value on the external display
unit.
When printing with the PRINT key of 1, 2 2
the external display unit with the
printer connected to it
When printing with the printer’s 0 2
“Printing” key or while in its timer
mode with the printer connected to
the external display unit.
When printing charts with the
printer.
□ Refer to the instruction manual of the AD-8922A for how to change internal settings of the
AD-8922A remote controller.

6. Connecting to a PC or a PLC
6-1. Quick USB mode
The quick USB mode is a function used to connect the balance with the PC using a USB cable to
directly input the output data of the balance into PC software such as Excel or Word. Windows XP
or later is supported.
Since the balance uses a standard Windows driver (HID), no installation of a special driver is
necessary and communication is possible just by connecting the balance to a PC.
Caution
□ Quick USB is a one-way communication from the balance to the PC. It is not possible to send
control commands from the PC to the balance.
□ Turn off the PC’s screen saver and stand-by modes.
About internal settings
□ With the internal setting of （Quick USB ALL） all data is output including the header
and units of the weighing data according to the output data format set in the internal setting
(USB data format).
□ With the internal setting of （Quick USB NU）only the weighing data values are
output.
Operating instructions (when sending weighing data using the balance's PRINT key)
1. Set the internal setting of the balance to (Quick USB ALL) or to (Quick USB NU).
2. Connect the balance to a PC with the supplied USB cable.
3. When connecting for the first time, the PC will automatically start installing the driver.
4. Start up PC software (Excel, etc.) for transmitting the weighing data.
5. Set the keyboard input mode to half-width characters[A1]. In case of full-width setting activated
the data will not be input correctly.
6. Move the cursor to the place you want to input the weighing data.
7. When you press the PRINT key on the balance, weighing data will be transmitted from the
balance and input at the location of the cursor.
8. Disconnect the USB cable when finished.
6-2. Virtual COM mode
Virtual COM mode is a function used to connect the balance with the supplied USB cable and create
a COM port on the PC side for bidirectional communication. Windows XP or later is supported.
Except for Windows 10, when using for the first time, you need to install a special driver on the PC.
For details on how to install the driver, please refer to "Installing the driver for the GX-A / GF-A
series USB interface "Virtual COM mode" on our website (http://www.aandd.co.jp).
About internal settings
□ When using Virtual COM mode, please put the balance’s internal setting to
( bidirectional USB virtual COM).

6-3. RS-232C
The RS-232C interface of the balance is the DCE (Data Communication Equipment) that can be
connected to a PC. The RS-232C cable used for connection is the straight type. If there is no
RS-232C connector on the PC, please connect in USB Virtual COM mode.
6-4. WinCT data transmission software（USB Virtual COM mode or RS-232C）
When a PC is connected through a USB connection in virtual COM mode or with a RS-232C cable,
weighing data can be easily received by the PC with the use of the WinCT data communication
software for Windows. WinCT can be downloaded from our website (http://www.aandd.co.jp). Please
refer to "WinCT setup procedures" and "WinCT operation manual" on our website
(http://www.aandd.co.jp) for installation and setup.
There are 3 applications in WinCT: RsCom, RsKey and RsWeight.
RsCom
□ You can control the balance by sending a command to it.
□ Received data can be displayed and saved as a text file (.txt).
□ By executing the software multiple times, you can communicate with multiple balances.
□ It can be executed simultaneously with other applications. (Does not exclusively occupy the PC)
□ GLP output data can also be received from the balance.
RsKey
□ Weighing data from the balance can be input directly into another applications.
□ If input by keyboard (e.g. with Word or Excel) is possible, the type of application does not matter.
□ GLP output data from the balance can also be input.
□ The PC can be made into an external display for the balance through the use of the test display
function.
RsWeight
□ Received data can be graphed in real time.
□ Parameters of received data such as maximum value, minimum value, average value, standard
deviation, coefficient of variation, etc. can be calculated and displayed.

7. Data output
7-1. Data output mode

As for the balance’s data output timing, it can be changed with the internal setting (data
output mode).
Key mode Internal setting
If the PRINT key is pressed when the stable value mark is displayed, the weighing value will be
output once.
At that time the displayed weighing value will blink once to indicate that it had been output.
Auto print A mode Internal setting

When the weighing value exceeds the range specified by the internal setting (auto print
polarity) and the internal setting (auto print width) from the standard "zero display" and the
stable value mark is on, the weighing value will be output once. Also, if the PRINT key is pressed
while the stable value mark is on, the weighing value will be output once.
Related internal settings
Auto print polarity
Auto print width
Auto print B mode Internal setting

When the weighing value exceeds the range specified by the internal setting (auto print
polarity) and the internal setting (auto print width) from the standard "value previously
displayed with a stable value mark" and the stable value mark is on, the weighing value will be
output once. Also, if the PRINT key is pressed while the stable value mark is on, the weighing value
will be output once. At that time the displayed weighing value will blink once to indicate that it had
been output.
Auto print polarity
Auto print width
Stream mode Internal setting

Regardless of the presence or absence of the stable value mark, weighing value will be output for
each internal setting (display rewrite cycle). When the internal setting is (5 times /
sec), the output is at approximately 5.21 Hz.
Display rewrite cycle
Baud rate
Caution
□ Depending on the display rewrite cycle and the baud rate, all data may not be transmitted
unless the baud rate is increased.

Key mode B mode Internal setting
Regardless of the presence or absence of the stable value mark, when the PRINT key is pressed, the
weighing value will be output once.
Key mode C mode Internal setting

When the PRINT key is pressed and the stable value mark is displayed, the weighing value will be
output once. In case the stable value mark is not displayed, the weighing value will be output once
the stable value mark is displayed next time.
Interval mode Internal setting

Regardless of the presence or absence of the stable value mark, values will be output at an interval
of the internal setting (interval time). By pressing the PRINT key data output is started and
stopped by pressing it again during the data output.

Interval time
Baud rate
Caution
□ Depending on the interval time and the baud rate, all data may not be transmitted unless the
baud rate is increased.

7-2. Weighing data format
As for the balance’s weighing data output, for USB it can be changed by the internal setting U-tP
(USB data format) and for RS-232C – by the internal setting (data format).
Standard format A&D RS-232C connection：internal setting

USB setting： internal setting
□ This is the standard format for sending data to peripheral devices.
□ Consists of 15 characters (excluding the terminator).
□ The condition of the data is indicated with a 2-character header.
□ The data is padded with polarity and zeros (filling the data’s higher order’s surplus part with
zeros).
□ If the data is zero, the polarity is positive.
□ The unit consists of three characters.
S T , + 0 0 1 2 3 . 4 5 _ _ g CR LF
Header Data Unit Terminator

S T When stable _ means “space”
U S When unstable
<CR> is the ASCII:0Dh code
Q T Counting mode when stable
<LF> is the ASCII:0Ah code
O L When overloaded
□ Printing pattern of the AD-8127 compact printer is as follows:
WT, +1234.56 g
DP format（Dump print） RS-232C connection： internal setting

USB connection： no function
□ This format is suitable for dump printing.
□ The condition of the data is indicated with a 2-character header.
□ The polarity sign is added right before the data if the data is not overloaded or zero.
□ The data is zero-suppressed (leading zeros are replaced with spaces).
□ The unit consists of three characters.
W T _ _ _ _ + 1 2 3 . 4 5 _ _ g CR LF
Heade Data Unit Terminator

W T r When stable _ means “space”
U S When unstable
Q T Counting mode when stable

KF format RS-232C connection： internal setting
□ This is the Karl-Fischer moisture meter format.
□ Has no header characters.
□ The polarity sign (1 character) is placed before the data if the data is not overloaded or zero.
□ When stable, the unit is output. When not stable, the unit is not output.
+ _ _ _ 1 2 3 . 4 5 _ g _ _ CR LF
Data Unit Terminator

_ means “space” _ g _ _ With the unit when stable
_ _ _ _ No unit when unstable
MT format RS-232C connection： internal setting

□ Used when connecting to devices manufactured by other companies. However, there is no
guarantee of compatibility.
□ The length of data depends on the length of the unit
□ Has a 2-character header.
S _ _ _ _ _ 1 2 3 . 4 5 _ g CR LF
Header Data Unit Terminator

S _ When stable（Output with a command） _ means “space”
S D When unstable（Output with a command）
S I When overloaded
_ _ When stable（Output with the PRINT key）
_ D When unstable（Output with the PRINT key）
NU format RS-232C connection： internal setting

USB setting： internal setting
□ This format outputs only numerical data.
□ The data is padded with polarity and zeros (filling the data’s higher order’s surplus part with
zeros).
□ If the data is zero, the polarity is positive.
+ 0 0 1 2 3 . 4 5 CR LF
Data Terminator

CSV format RS-232C connection： internal setting
USB connection： internal setting
□ Separates the data of A&D standard format and the unit by a comma (,).
□ Outputs the unit even when the data is overloaded.
□ When the decimal point is set to comma (,), semicolon (;) will be used as the separator.
S T , + 0 0 1 2 3 . 4 5 , _ _ g CR LF
□ When other data is added to the weighing value, all data will be displayed in one line.
The display sample will be as follows if the ID number, data number, date and time are added.
SAMPLE-0123-4,No,012,2017/07/01,12:34:56,ST,+00123.45, g
ID Data number Date Time Weighing

number data
TAB format RS-232C connection： no function

USB connection： internal setting
□ This is a format, in which the separator of the CSV format is changed from comma to TAB.
S T TAB + 0 0 1 2 3 . 4 5 TAB _ _ g CR LF
<TAB> is the ASCII:09h code

7-3. Output examples of weighing data format
When stable
A&D S T , + 0 3 1 4 2 . 0 6 _ _ g CR LF
DP W T _ _ _ + 3 1 4 2 . 0 6 _ _ g CR LF
KF + _ _ 3 1 4 2 . 0 5 _ g _ _ CR LF
MT S _ _ _ _ 3 1 4 2 . 0 6 _ g CR LF
NU + 0 3 1 4 2 . 0 6 CR LF
When unstable
A&D U S , - 0 0 2 9 5 . 8 7 _ _ g CR LF
DP U S _ _ _ - 2 9 5 . 8 7 _ _ g CR LF
KF - _ _ _ 2 9 5 . 8 7 _ _ _ _ CR LF
MT S D _ _ _ - 2 9 5 . 8 7 _ g CR LF
NU - 0 0 2 9 5 . 8 7 CR LF
When overloaded
（plus）
A&D O L , + 9 9 9 9 9 9 9 E + 1 9 CR LF
DP _ _ _ _ _ _ _ _ E _ _ _ _ _ _ _ CR LF
KF _ _ _ _ _ _ H _ _ _ _ _ _ _ CR LF
MT S I + CR LF
NU + 9 9 9 9 9 9 9 9 CR LF
When overloaded
（minus）
A&D O L , - 9 9 9 9 9 9 9 E + 1 9 CR LF
DP _ _ _ _ _ _ _ - E _ _ _ _ _ _ _ CR LF
KF _ _ _ _ _ _ L _ _ _ _ _ _ _ CR LF
MT S I - CR LF
NU - 9 9 9 9 9 9 9 9 CR LF

7-4. Other data formats
In addition to weighing data, other data can be added. Switch each internal setting on / off as
necessary.
Data number Internal setting

□ When the data memory function is used, the data number is output.
N o . 0 0 1 CR LF
Data Terminator
number
ID number Internal setting

□ The ID number stored in the balance is output.
S A M P L E - 0 1 2 3 - 4 CR LF
ID number Terminator
Date Internal setting or

□ The date is output from the clock data of the balance.
□ The order of YYYY／MM／DD can be changed in settings.
2 0 1 7 / 1 2 / 3 1 CR LF
Date Terminator
Time Internal setting or

□ The time is output from the clock data of the balance.
□ 24-hour format.
1 2 : 3 4 : 5 6 CR LF
Time Terminator

8. Commands
By sending a specified command from a PC or a PLC to the balance, you can control the balance
such as by requesting weighing data, manipulating various keys and changing the setting value. To
send a command to the balance, add a terminator (<CR> <LF> or <CR> in the internal
setting ) to the command character string.
8-1. Control commands
Commands to query weighing data

Command string Function
Q Requests the weighing data immediately
RW Requests the weighing data immediately
SI Requests the weighing data immediately
S Requests the weighing data when stabilized.
<ESC>P Requests the weighing data when stabilized.
SIR Requests the weighing data continuously. (Stream output)
C Cancels the S, <ESC>P or SIR command.
□ The Q, RW and SI commands behave the same.
□ The S and <ESC>P commands behave the same.
□ <ESC>：Escape code, ASCII:1Bh code
Key control commands

P Same as the ON:OFF key
ON Turns the display on.
OFF Turns the display off.
CAL Same as the CAL key : Calibration with built-in weight（GX-A Series）
Calibration with a separate weight（GF-A Series）
EXC Calibration with a separate weight（GF-A Series）
U Same as the MODE key
SMP Same as the SAMPLE key
PRT Same as the PRINT key
R Same as the RE-ZERO key（Semi-automatic zero point setting）
Z Same as the RE-ZERO key（Semi-automatic zero point setting）
RZ Same as the RE-ZERO key（Semi-automatic zero point setting）
T Tares the balance
TR Tares the balance
ZR Zero（Setting the zero point）
□ The R, Z and RZ commands behave the same.
□ The T and TR commands behave the same.

Commands for presetting the tare value
PT：＊＊＊＊.＊＊ g Sets the tare value.
The unit added is the unit that is output in the A&D standard format (3
characters). For the counting or percent mode, gram is used. In the case
of setting the preset tare value to 1234.56 g, the input will be
PT:1234.56 g. Values exceeding the weighing capacity cannot be set.
Negative values cannot be used.
?PT Requests the tare value. Outputs the tare value set by the PT, T or TR:
command.
Command to control piece count

UW：＊＊＊＊.＊＊ g Sets the unit mass value (weight of 1 piece)
characters). In the case of setting the unit mass value to 1.23 g, the
input will be UW:1.23 g.
Values exceeding the weighing capacity cannot be set. Negative values
cannot be used.
?UW Requests the mass unit value.
UN：mm Changes the unit mass registration number. Input values from 01 to 50
before mm.
?UN Outputs the unit mass number of the selected unit mass.
Commands to control the comparator function

HI：＊＊＊＊.＊＊ g Sets the upper limit value.
HH：＊＊＊＊.＊＊ g Sets the second upper limit value.
LO：＊＊＊＊.＊＊ g Sets the lower limit value.
LL：＊＊＊＊.＊＊ g Sets the second lower limit value.
characters).
In the case of setting the upper limit value to 567.89 g, the input will be
HI:567.89 g.
Values exceeding the weighing capacity cannot be set.
?HI Requests the upper limit value.
?HH Requests the second upper limit value.
?LO Requests the lower limit value.
?LL Requests the second lower limit value.
□ To use a comparator command, set it to the internal setting (digital input, upper /
lower limits) or (Weighing input, upper / lower limits).

Command to control the data memory function
?MA Outputs all data in memory.
?MQnnn Outputs weighing data with the data number nnn.
Input a value from 001 to 200 before nnn.
?MX Outputs the number of weighing data in memory.
MD：nnn Deletes weighing data with the data number nnn.
Input a value from 001 to 200 before nnn.
MCL Deletes all data in memory.
Commands for setting time and date

TM：＊＊：＊＊：＊＊ Sets time.
In the case of setting time to 12h 34 min 56 sec, the input will be
TM:12:34:56.
Do not set non-existing time values.
DT：＊＊／＊＊／＊＊ Sets date.
In the case of setting date to Jan 1, 2017, the input will be
DT:17/01/23.
Do not set non-existing date values.
?TM Requests time setting.
?DT Requests date setting.
Commands to request other data

?T Requests the tare weight value.
The tare value set by T, TR command is output.
?ID Requests ID number.
?SN Requests serial number.
?TN Requests device name.

8-2. The <AK> code and error codes
When the internal setting （AK、error code on）is set、the balance always responds to
reception of all commands sent from a PC or a PLC. Communication reliability is improved by
checking the responding code.
When the internal setting （AK、error code on）is set, the balance responds with the
following.
□ When sending a command requesting various data to the balance, if the balance cannot
transmit the requested data, it sends an error code (EC, Exx). If the balance can output the
requested data, the requested data will be sent.
□ When sending a controlling command to the balance, if the balance cannot execute the command,
it sends an error code (EC, Exx). If the balance can execute the command, it sends the <AK>
code.
<AK> code is the ASCII 06h code.
□ The commands below are processed by the balance, so it will send the <AK> command not only
when a command is received, but also at the end of processing. If the process does not end
normally, the balance sends an error code (EC, Exx), in which case the error is canceled with
the CAL command.
ON command Display on
P command Display on / off（However, only when already on）
R、Z、RZ commands Re-zero（Semi-automatic zero point setting）
T、TR commands Tare the balance
ZR command Zero（Setting the zero point）
CAL command Calibration with built-in weight（GX-A Series）
Calibration with a separate weight（GF-A Series）
EXC command Calibration with a separate weight（GX-A Series）

8-3. Command usage examples
In this example in order to force an output of the <AK> code the internal setting （AK、
error code on）is set. <AK> code is the ASCII 06h code.
Example of the ON command（display on）
PC side Time Balance side
ON command
Display off, stand by
O N CR LF
AK CR LF Command received
All segments are displayed

（processing）
AK CR LF Command completed
Zero display
Example of the R command （Re-zero）
R command
Before execution
R CR LF
Waiting for re-zero stability

（processing）
Zero display

Example of the CAL command （GX-A Series）Calibration with built-in weight）
CAL command
Before execution
C A L CR LF
Executing（processing）
Zero display
□ For an example of the CAL command for the GF-A series, see the example of the EXC command.
Example of error code output of the R command (re-zero)
PC side Time Balance
R command
Before execution
R CR LF

（processing）, time up due
to instability
E C , E 1 1 CR LF
Error code output

CAL command
Error display
C A L CR LF
Or stand by for 5 seconds
Zero display

Example of the EXC command Calibration with a separate weight（GF-A Series）
EXC command
Before execution
E X C CR LF
PRT command
Waiting for the zero setting
P R T CR LF
Inputting the zero setting

（processing）
Waiting for weight value

input
PRT command Action: Place calibration weight

P R T CR LF
Inputting the value of the

weight（processing）
Waiting for weight removal
Action: Removing the weight

（processing）
Zero display

Example of measuring using a container
R command
Before execution
R CR LF

（processing）
Zero display
Action: Place a container
T command Measured value of the

container
T CR LF
Waiting for container

subtraction stability
（processing）
Zero display
Action： Place sample
S command
Measured value of sample
S CR LF
S T , + 0 1 0 0 0
Net
?PT command . 0 0 _ _ g CR LF
value
? P T CR LF
P T , + 0 0 1 2 3
Tare
. 4 5 _ _ g CR LF
value

Example of setting a negative target value and filling with a sample until the display
becomes zero
R command Action: Place a container

R CR LF
Waiting for
re-zero stability
（processing）
PT command AK CR LF Command completed

Target weight is 500g
P T : 5 0 0 . Zero display
0 0 _ _ g CR LF
Container weight
value Displayed
with the negative
sign
Action: Fill with sample
Filling
When 500.00g of
sample is filled

9. Error codes
9-1. Error codes list
Error codes and how to resolve

Error code Description and how to resolve
EC,E00 Communications error
A protocol error occurred in communications.
Check the format and the baud rate.
EC,E01 Undefined command error
An undefined command was received.
Check the command.
EC,E02 Not ready
The command received cannot be processed.
e.g. The balance received a Q command, which requested the weighing data,
but it was not in the weighing mode with the display on.
e.g. The balance received a Q command while processing a RE-ZERO
command.
Adjust the timing of transmitting the command.
EC,E03 Timeout error
The internal setting of the timeout parameter is set to (limit set
to 1 second for the command timeout), so the balance did not receive the next
command within the time limit of one second.
Check the communication.
EC,E04 Excess characters error
The balance received excessive characters in a command.
Check the command.
EC,E06 Format error
The format of the received command is incorrect.
e.g. The data is numerically incorrect.
e.g. Alphabet characters are input instead of values.
Check the command.
EC,E07 Setting value error
The received data exceeds the range of values that the balance can accept.
Check the parameter values range of the command.
EC,E11 Weighing values stability error
Because the weighing value is unstable, it is not possible to rezero or
calibration.
Improve the environment of the location where the balance is installed.
Send a CAL command or wait 5 seconds to reset the error.

Error code Details and ways to address
EC,E16 Built-in weight error
There was no change in load even when the built-in weight was raised and
lowered.
Perform the weighing operation from the beginning without placing anything
on the pan.
EC,E17 Built-in weight error
There was an error in the mechanism of raising and lowering the built-in
weight.
Perform the weighing operation from the beginning.
EC,E20 Calibration weight error (heavy)
The calibration weight is too heavy.
Check the nominal calibration weight value.
EC,E21 Calibration weight error (light)
The calibration weight is too light.
Check the nominal calibration weight value.

10. The UFC function
By using the UFC (Universal Flex Coms) function, it is possible to arbitrarily output contents of
your choice when outputting the weighing data. You can also output a character string when
printing a barcode with a label printer or the like.
In order to use the UFC function, it must be set to internal setting (UFC function on).
10-1. UFC program commands
To select the output format to use, send the program command from the PC and store it in the
balance. The stored output format is saved even when the balance is turned off.
How to create program commands

□ The maximum number of characters of a program command is 32 characters per line (including
the terminator) with the total maximum being 384.
□ First, add the PF, command.
□ Program commands are combined in comma-delimited or space-separated form, but they can be
omitted to reduce the number of characters. However, the comma after the PF command cannot
be omitted.
List of program commands

Command Contents Example of output
PF, UFC command header
It is appended to the beginning of the program
command.
$MN Manufacturer name A&D
$TY Model name GX-10002A
$SN Serial number T1010101
$ID ID number SAMPLE-1234-5
$DT Date 2017/01/23
$TM Time of Day 12:34:56
$WT Weight data +1234.56 g
$GR Gross data (total amount) +1234.56 g
$NT Net data (net) +234.56 g
$TR Tare data (tare) +1000.00 g
$PC Number data +1234 PC
$UW Single data +0.12 g
$CP Comparator result HI
$CM Comma ,
$SP Space _（ASCII 20h code）
$CR <CR> ASCII 0Dh code

$LF <LF> ASCII 0Ah code

□ Enclose any ASCII code string in single quotation marks. The character strings that can be
output are alphanumeric characters and symbols. In addition, the single quotation marks
themselves are enclosed in two single quotation marks.
Example: To output the character string ABC: 'ABC'
To output the character string 'ABC': '”ABC”'
□ To output the ASCII control code, enter '# + 2 hexadecimal characters'.

Example: To output <EOT> (04h): # 04
□ Spaces ($ SP), <CR> ($ CR), and <LF> ($ LF) can be repeated with numbers by adding '* +
numbers (up to 2 characters)' after the command.
Example: To output 12 spaces: $ SP * 12
To output 9 <CR>’s : $ CR * 9
□ When sending a program command of two or more lines, adding '&' at the end of one line the
balance will judge the next line as the continuation of the program command.
□ The balance sends an error code if there is a problem after receiving a program command and
sends an <AK> code if there is no problem. <AK> code is ASCII 06h code.
□ WinCT-UFC Data communication software is available for inputting program commands.

WinCT-UFC can be downloaded from our website (http://www.aandd.co.jp).

10-2. Examples of creating UFC program commands
Output example 1 Output example 2

NET 2017/01/23 12:34:56
+2000.00 g SAMPLE ABC-123
TARE WEIGHT +3456.78 g
+345.67 g
GROSS
+2345.67 g Content
PF, command, date, time, line break
Character string "SAMPLE ABC-123", line
Description break
PF, command, character string Character string "WEIGHT ", weight data
"NET", line break
Space × 5, net data, line break Example of program command
Character string "TARE", line PF,$DT,$TM,$CR,$LF,&
break ‘SAMPLE ABC-123’,$CR,$LF,&
Space × 6, tear data, line break ‘WEIGHT ’,$WT,$CR,$LF
Character string "GROSS", line
break Terminator
Example of program command
PF,’NET’,$CR,$LF,&
$SP*5,$NT,$CR,$LF,&
‘TARE’,$CR,$LF,&
$SP*6,$TR, $CR,$LF,&
‘GROSS’, $CR,$LF,&
$SP*5,$GR,$CR,$LF
Terminator

11. Internal settings
By changing internal settings of the balance, you can customize balance usage. The contents of the
settings are saved even when the AC adapter is unplugged and they are effective until set again. In
the internal settings menu structure each setting entry is placed in its classification item and one
setting value is registered for each setting entry.
11-1. How to set
Operation keys and indication

The 〇 mark is displayed for the currently active setting values.
Press and hold while the weighing value is being displayed to enter the
internal settings menu. (the classification item menu)
Then move between items in the internal settings menu.
Change the setting value (by +1). When it exceeds the maximum set
value, it returns to 0.
Enter the settings menu from the classification items menu.
Input the value and move to the next classification item.
In the settings menu push to cancel the input value and move to the
next classification item.
In the classification menu push to complete internal settings and
return to the value indication screen.
Procedure for changing settings

1. Press and hold the SAMPLE key while the weighing value is displayed, release the key when
is displayed.
2. Continue to the classification item to be set with the SAMPLE key.
3. Enter into the classification item currently displayed with the PRINT key. The first setting item
is displayed.
4. Use the SAMPLE key to toggle between the setting item to be set.
5. The value of the setting item currently displayed key can be increased by 1 with the RE-ZERO
key. Keep pressing the RE-ZERO key until you reach the value you would like to set.
6. Repeat steps 4 and 5 to change other setting item(s) within the same classification item.
If you want to move to another category, continue to step 7.
7. To confirm (register) the setting of the current classification item, press the PRINT key. The
setting value is saved and you proceed to the next classification item.
To cancel the setting of the current classification item, press the CAL key. The set value is
canceled and you proceed to the next classification item.
8. Repeat from step 2 to make settings in another category.
To finish configuration, press the CAL key. You will return to the weighing screen.

Configuration example
Example of setting "Time/Date output" to "outputting Time/Date" and "Data format" to "DP
format".
Start, weighing display
Keep pressing（Procedure 1）
Classification item
Press several times（Procedure2）
Setting item
（Procedure 3） Press several times

（Procedure 4） Changing the
setting value
Press twice（Procedure 5）（Procedure7）
（Procedure3）
Press several times（Procedure 4）
（Procedure7）
Press once（Procedure 5）
（Procedure 8）
Completion、weighing display

11-2. List of items (communication entries only)
This is a list of items related to communication of internal setting values. For other items, refer to
the GX-A / GF-A instruction manual.
Classification Setting item Setting Contents, usage
item value
… Refer to the GX-A / GF-A instruction manual
■ Key mode Data output with the PRINT

Data output Data output mode key when the weighing value
is stable
Auto print A mode Data output of a stable
weighing value when it
（reference = zero point） exceeds the range of
and in relation to
zero.
Auto print B mode Data output of a stable
weighing value when it
（reference = previous exceeds the range of
stable value） and in relation to
previous stable value.
Strem mode Output every time when the
display value is renewed
Key mode B mode Data output regardless of
（immediate output） stability / instability with the
PRINT key
Key mode C mode Data is output when stable
with the PRINT key and if
unstable, it is output once is
has stabilized
Interval mode Data output after every cycle
set by the setting
Only plus When greater than reference
Auto print Polarity value
Only minus When smaller than reference
value
■ Bipolarity Regardless of the value size
compared with reference value
■ 10 digits Difference from reference
Auto print difference 100 digits value
1000 digits
□ “■” Factory setting.
□ ”1 digit” stands for a smallest displayed order. In case of GX-303A 1 digit is 0.001g.

item value
■ No used
Data output Data memory function Stores unit mass
（Cont.） Stores weighing data,
and calibration data
Every measurement Used when outputting
Interval time ■ Every 2 seconds with intervals set in
Every 5 seconds
Every 10 seconds
Every 30 seconds
Every 1 minute
Every 2 minutes
Every 5 minutes
Every 10 minutes
■ Do not output Refer to "7-4. Other
Data number output Output data formats"
■ Do not output
Refer to "7-4. Other
Time/Date output Output time
data formats"
Output date
Output date and time
■ Do not output Refer to "7-4. Other
ID number output Output data formats"
■ Off Select interval before
Data output pause 1.6-second pause data output
■ Off Select line feed (paper
Auto feed Leave one line open feed) after data output
■ Do not output
GLP output Output
■ Off Select re-zero after
Auto re-zero On data output
■ Off Refer to "10. The UFC
UFC function On function"

item value
■ PC
Serial Connection Printer or
interface destination and stream
External display
output
600 bps
Baud rate 1200 bps
■ 2400 bps
4800 bps
9600 bps
19200 bps
38400 bps
■ 7 bit EVEN
Data bit, parity bit 7 bit ODD
8 bit NONE
■ CR LF CR: ASCII 0 Dh code
Terminator CR LF: ASCII 0 Ah code
■ A&D Standard format
Data format DP format Refer to "7-2. Weighing
KF format data format"
MT format
NU format
CSV format
■ No limit Select waiting time during
Timeout Limited to 1 second command reception
Off Refer to "8-2. The <AK>
AK、error code ■ On code and error codes"
■ Quick USB ALL See "6-1. Quick USB mode"
USB USB operation mode Quick USB NU See "6-2. Virtual COM mode"
Interface Bidirectional USB
virtual COM
■ A&D standard format Refer to "7-2. Weighing
USB NU format data format"
Data format CSV format
TAB format
… Refer to the GX-A / GF-A instruction manual

Caution
1) Unauthorized reproduction of any part or all of the contents of this document is strictly
prohibited.
2) The contents of this document are subject to change without notice.
3) If you have any doubts about or notice any mistakes in the contents of this document, please
contact your dealer or our nearest sales office.
4) As for any claims for damages, loss of profit, etc. related to the operation of this machine
regardless of the proposed actions from above-mentioned clause 3), our company bears no
responsibility with regard to such claims.
© 2017 A&D Company, Limited.

Do not copy or modify this document without the permission of A&D Company, Limited.
Microsoft, Windows, Excel, Word are trademarks of the Microsoft Corporation registered in the
United States and other countries.

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GX-A Series / GF-A Series Communication Manual

GX-A Series/GF-A Series Communication Manual 1 / 41

GX-A Series/GF-A Series Communication Manual 2 / 41

1-1. Applicable models

1-2. Features of the communication function

□ The RS-232C interface is provided as standard, enabling communication similar to conventional

GX-A Series/GF-A Series Communication Manual 3 / 41

GX-A Series/GF-A Series Communication Manual 4 / 41

miniB, pin arrangement

GX-A Series/GF-A Series Communication Manual 5 / 41

3-1. Connecting the balance to a printer

3-2. Connecting the balance to an external display unit

Balance External display unit

GX-A Series/GF-A Series Communication Manual 6 / 41

Balance External display unit Printer

3-3. Connecting the balance to a PC or a PLC

□ Connect the balance to a PC using a USB or an RS-232C cable.

□ Connect the balance to a PLC using a RS-232C cable.

GX-A Series/GF-A Series Communication Manual 7 / 41

External display unit

GX-A Series/GF-A Series Communication Manual 8 / 41

External display unit

GX-A Series/GF-A Series Communication Manual 9 / 41

Internal settings of the printer

Connection Data output Data format

GX-A Series/GF-A Series Communication Manual 10 / 41

Internal settings of the external display unit and the balance

GX-A Series/GF-A Series Communication Manual 11 / 41

6-1. Quick USB mode

6-2. Virtual COM mode

GX-A Series/GF-A Series Communication Manual 12 / 41

6-4. WinCT data transmission software（USB Virtual COM mode or RS-232C）

There are 3 applications in WinCT: RsCom, RsKey and RsWeight.

GX-A Series/GF-A Series Communication Manual 13 / 41

7-1. Data output mode

Auto print A mode Internal setting

Auto print B mode Internal setting

Stream mode Internal setting

GX-A Series/GF-A Series Communication Manual 14 / 41

Key mode C mode Internal setting

Interval mode Internal setting

Related internal settings

GX-A Series/GF-A Series Communication Manual 15 / 41

Standard format A&D RS-232C connection：internal setting

Header Data Unit Terminator

□ Printing pattern of the AD-8127 compact printer is as follows:

DP format（Dump print） RS-232C connection： internal setting

Heade Data Unit Terminator

GX-A Series/GF-A Series Communication Manual 16 / 41

Data Unit Terminator

MT format RS-232C connection： internal setting

Header Data Unit Terminator

NU format RS-232C connection： internal setting

GX-A Series/GF-A Series Communication Manual 17 / 41

ID Data number Date Time Weighing

TAB format RS-232C connection： no function

<TAB> is the ASCII:09h code

GX-A Series/GF-A Series Communication Manual 18 / 41

GX-A Series/GF-A Series Communication Manual 19 / 41

Data number Internal setting