Gx Serial

2016-06-18

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16. RS-232C SERIAL INTERFACE / EXTERNAL INPUT
RS-232C
The balance is a DCE device. Connect the balance to a personal computer (DTE), using a straight
through cable or a modem cable.
Transmission system
Transmission form
Data format

:
:
:

EIA RS-232C
Asynchronous, bi-directional, half duplex
Baud rate
: 600, 1200, 2400, 4800, 9600 bps
Data bits
: 7 or 8 bits
Parity
: Even, Odd (Data bits 7 bits)
None
(Data bits 8 bits)
Stop bit
: 1 bit
Code
: ASCII

Pin connections
Pin No.
1
2
3
4
5
6
7
18
19
8 – 25 (Excluding 18 and
19)

Signal name Direction Description
FG
Frame ground
RXD
Input
Receive data
TXD
Output Transmit data
RTS
Input
Ready to send
CTS
Output Clear to send
DSR
Output Data set ready
SG
Signal ground
PRINT
Input
Same as the PRINT key
RE-ZERO
Input
Same as the RE-ZERO key
Not connected

Note
The signal names for the RS-232C are the same as those for the DTE side except TXD and
RXD.

Circuits

65

External input
Pin 18 and pin 19 perform the same function
as pressing the PRINT and RE-ZERO keys
respectively by connecting each pin to pin 7
for at least 100 m seconds.

Use of example

The
external
input
(AX-HDB-25P/CTF) and the
(AX-SW128) are sold separately.

66

connector
foot switch

17. CONNECTION TO PERIPHERAL EQUIPMENT
17-1 Connection to the AD-8121B Printer
Set the following parameters to use the AD-8121B printer.
Function setting
dout prt 0-3
dout ap-p 0-2
dout ap-b 0-2
dout pU5e 0,1
5if bp5 2
5if btpr 0
5if Crlf 0
5if Ct5 0

Factory setting
Factory setting
Factory setting
Factory setting

Description
Selects a print mode.
Selects the polarity for the auto print mode.
Selects the auto print difference.
Selects data output pause.
2400 bps
7 bits, Even parity check
CR, LF
CTS and RTS control, not used

When “MODE 1” or “MODE 2” of the AD-8121B printer is used
dout 5-td 0
Factory setting
Not to output the time and date.
dout 5-id 0
Factory setting
Not to output the ID number.
dout at-f 0
Factory setting
Not to use auto feed.
5if type 0
Factory setting
A&D standard format
When “MODE 3” of the AD-8121B printer is used.
dout 5-td 0-3
Outputs the time and date as necessary.
dout 5-id 0,1
Outputs the ID number as necessary.
dout at-f 0,1
Uses auto feed as necessary.
5if type 1
DP format
When data is transmitted continuously.
When all memory data is transmitted at one time.
dout pU5e 1
Uses pause.
Note
The printer performs as follows, depending on the data memory setting.
Setting
data 0
data 2
data 3

What is printed
The weighing data
The weighing data stored in memory
The calibration or calibration test data stored in memory

Refer to “11. ID NUMBER AND GLP REPORT” for a print sample.

17-2 Connection to a Computer
The GX series balance is of the DCE type (Data Communication Equipment), which can be
connected to a personal computer using the RS-232C interface.
Before connection, read the personal computer manual thoroughly.
Use a standard DCE cable for connection (cable type: straight-through).

67

17-3 Using Windows Communication Tools (WinCT)
When Windows is used as an operating system in a personal computer, the provided WinCT can be
used to transmit the weighing data to the personal computer.
The WinCT has two communication methods: “RsCom” and “RsKey”. For details on WinCT, refer to
the WinCT instruction manual.
The current version of the WinCT can be downloaded from the A&D website.

RsCom
Can transmit commands to control the balance.
Can make a bi-directional communication between the balance and a personal computer using
the RS-232C interface.
Can display or store the data using a text file format. Can also print the data using a printer
connected to the personal computer.
When several ports of a personal computer have balances connected, the personal computer
can communicate with each balance simultaneously.
Can share a personal computer with other application software.
Can receive the balance GLP report.

RsKey
Can transmit the weighing data output from the balance directly to other application software
such as Microsoft Excel.
Can be used with most application software.
Can receive the balance GLP report.
Note
Windows and Excel are the registered trademarks of the Microsoft Corporation.

Using the WinCT, the balance can do the following:
1 Analyzing the weighing data and the statistics input by “RsKey”
The weighing data can be input directly into an Excel worksheet. Then, Excel can analyze the
data to obtain total, average, standard deviation, maximum and minimum value, and display
them in a graph.
2 Controlling the balance using commands from a personal computer
By using “RsCom”, the personal computer sends commands such as “re-zero” or “send
weighing data” to the balance and controls the balance.
3 Printing the balance GLP report using your printer
The balance GLP report can be printed using a printer connected to the personal computer.
4 Receiving weighing data at a certain interval
The weighing data can be received at a certain interval and data characteristic with elapsed
time can be obtained.

68

5 Using the GX series balance memory function
The weighing data, instead of outputting it immediately to an external device, can be stored in
the balance’s memory. Later, all of the weighing data stored can be output to a personal
computer at one time.
6 Using a personal computer as an external indicator
With the “RsKey” test mode function, a personal computer can be used as an external weight
indicator for the balance. (To do this, set the balance data output mode to stream mode.)

69

18. COMMANDS
18-1 Command List
Commands to query weighing data
C
Q
S
SI
SIR
E
SCP

Cancels the S or SIR command.
Requests the weighing data immediately.
Requests the weighing data when stabilized.
Requests the weighing data immediately.
Requests the weighing data continuously.
Requests the weighing data when stabilized.

Note: The “Q” and “SI” commands, the “S” and “ESCP” commands behave the same.

Commands to control the balance
CAL
MCL
MD:nnn
OFF
ON
P
PT: .

g

?PT
PRT
R
SMP
U
T
TR

Z
E
SCT

Same as the CAL key.
Deletes all data in memory.
Deletes weighing data with the data number nnn.
Turns the display off.
Turns the display on.
Same as the ON:OFF key
Sets the tare value.
The unit added is the unit that is output in the A&D standard format. For
the counting or percent mode, gram is used. Set the tare value so that
the total value of the sample and the tare does not exceed the weighing
capacity. Negative values can not be used.
Requests the tare value.
Outputs the tare value set by the TR or PT: command.
Same as the PRINT key
Same as the RE-ZERO key
Same as the SAMPLE key.
Same as the MODE key
Same as the RE-ZERO key
Tares the balance (Cancels the container’s weight.)
Available only when the load on the weighing pan is greater than the
zero point. The zero point is set by the R, T or Z command, by pressing
the RE-ZERO key, or using the external input.
Same as the RE-ZERO key
Same as the RE-ZERO key

Note: The “R”, “T”, “Z” and “ESCT” commands behave the same.

Commands to control the memory function
?MA
?MQnnn
?MX
MCL
MD:nnn
UN:mm
?UN
UW: .
?UW
?ID
?SN
?TN

g

Outputs all data in memory.
Outputs weighing data with the data number nnn.
Outputs the number of weighing data in memory.
Deletes all data in memory.
Deletes weighing data with the data number nnn.
Changes the unit mass stored in memory with the number of mm (01-20).
Outputs the unit mass number of the selected unit mass.
Sets the unit mass value. e.g.,UW:+0.123
g (to set the unit mass to
0.123 g: represents a space.)
Outputs the unit mass value of the selected unit mass number.
Requests the ID number.
Requests the serial number.
Requests the model name.

70

Commands to control the comparator function
HI:

.

LO:
?HI
?LO

g
.

g

Sets the upper limit value. e.g.,HI:+2.34
value to 2.34 g: represents a space.)
Sets the lower limit value. e.g.,LO:+1.23
value to 1.23 g: represents a space.)
Outputs the upper limit value.
Outputs the lower limit value.

g (to set the upper limit
g (to set the lower limit

Notes
“nnn” and “mm” indicate, respectively, three-digit and two-digit numerical values.
E
SC : 1Bh in ASCII code
Before transmitting a command, add the terminator ( or ), that is specified in
the “Terminator (Crlf)” parameter of “Serial interface (5if)” in the function table, to the
command.
To use a command to control the comparator function, set the “Input method (Cpin)” parameter to “0” or
“1”.

18-2 Acknowledge Code and Error Codes
When the “Serial interface function ( 5if )” parameter is set to “erCd 1”, the balance outputs 
code or error code to each command as follows:
 (06h)

Acknowledge in ASCII code.

When the balance receives a command to request data and can not process it, the balance
transmits an error code (EC, Exx).
When the balance receives a command to request data and can process it, the balance
outputs the data.
When the balance receives a command to control the balance and can not process it, the
balance transmits an error code (EC, Exx).
When the balance receives a command to control the balance and can process it, the balance
transmits the acknowledge code.
When a communication error has occurred due to external noise, or a parity error has
occurred due to transmission error, the balance transmits an error code. In this case, send the
command again.
Among commands to control the balance, the following transmit the acknowledge code both
when the balance receives the command and when the balance has accomplished the
command. If the command can not be processed properly, the balance transmits an error code
(EC, Exx). This error can be released using the CAL command.
CAL command (Calibration command)

ON command (Display ON command)

P command (Display ON/OFF command)

R command (RE-ZERO command)

TR command (Tare command)

71

18-3 Command Examples
ON command

Personal computer

Time

Balance
Standby mode

ON command
O N CR LF
AK CR LF

All segments

AK CR LF

Command received
All segments are displayed

Command completed
Zero display

R command

Personal computer

Time

Balance
Weighing mode

R command
R CR LF
AK CR LF

Command received
In process

AK CR LF

Command completed
Zero display

72

CAL command

Personal computer

Time

Balance
Zero display

CAL command
C A L CR LF
AK CR LF

Command received

AK CR LF

Command completed
Zero display

Error code

Personal computer

Time

Balance
Weighing mode (unstable)

R command
R CR LF
AK CR LF

Command received
In process
When the R command can not be
achieved due to unstable weighing:

E C ,

E 1 1 CR LF

Error code

CAL command
When the CAL command is
received, the balance returns to
the weighing mode

C A L CR LF

AK CR LF

Command completed
Weighing mode

73

Weighing with a tare
Personal computer

Time

Balance

R command

Sets the display to zero

R CR LF
AK CR LF

Command received
In process

AK CR LF

Command completed
Zero display

Place a container

TR command
Tares

T R CR LF
AK CR LF

Command received
In process

AK CR LF

Command completed
Zero display

S command
R CR LF

㹑㹒㸪㸩㸮㸮㸯㸮㸮㸬㸮㸮ࠉࠉ㹥

?PT command

(Net value)

? P T CR LF

㹎㹒㸪㸩㸮㸮㸯㸰㸴㸬㸶㸵ࠉࠉ㹥

(Tare value)

74

Setting a negative target value and filling with a sample until the display becomes
zero
Personal computer

Time

Balance
Place a container
Before command
execution

R command
R CR LF
AK CR LF

Command received
In process

AK CR LF

Zero display

PT: command to set a target weight of 100 g
P T :

1 0 0 .

0 0

Command completed

g CR LF
AK CR LF

Command received
Target weight display

Fill with sample until the
display becomes zero

75

18-4 Control Using CTS and RTS
Depending on the “Ct5” parameter of “Serial interface ( 5if )”, the balance performs as follows:

Ct5 0
Regardless of whether the balance can receive a command or not, the balance keeps the CTS line
HI. The balance outputs data regardless of condition of the RTS line.

Ct5 1
The CTS line is kept Hi normally. When the balance can not receive the next command (e.g. while
the balance is processing last command), the balance sets the CTS line to Lo. The balance confirms
the level of the RTS line before outputting a set of data. If the RTS level is Hi, the balance outputs
data. If the RTS level is Lo, data is not output (The data is canceled).

18-5 Settings Related to RS-232C
Concerning the RS-232C, the balance has two functions: “Data output ( dout )” and “Serial interface
( 5if )”. Set each function as necessary.

76
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