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65

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 : EIA RS-232C

Transmission form : Asynchronous, bi-directional, half duplex

Data format : 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. Signal name Direction Description

1 FG - Frame ground

2 RXD Input Receive data

3 TXD Output Transmit data

4 RTS Input Ready to send

5 CTS Output Clear to send

6 DSR Output Data set ready

7 SG - Signal ground

18 PRINT Input Same as the PRINT key

19 RE-ZERO Input Same as the RE-ZERO key

8 – 25 (Excluding 18 and

19)

- - Not connected

Note

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

RXD.

Circuits

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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 connector

(AX-HDB-25P/CTF) and the foot switch

(AX-SW128) are sold separately.

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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 Description

dout prt 0-3 Selects a print mode.

dout ap-p 0-2 Selects the polarity for the auto print mode.

dout ap-b 0-2 Selects the auto print difference.

dout pU5e 0,1 Selects data output pause.

5if bp5 2 Factory setting 2400 bps

5if btpr 0 Factory setting 7 bits, Even parity check

5if Crlf 0 Factory setting CR, LF

5if Ct5 0 Factory setting 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 What is printed

data 0 The weighing data

data 2 The weighing data stored in memory

data 3 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).

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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.

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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.)

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18. COMMANDS

18-1 Command List

Commands to query weighing data

C Cancels the S or SIR command.

Q Requests the weighing data immediately.

S Requests the weighing data when stabilized.

SI Requests the weighing data immediately.

SIR Requests the weighing data continuously.

ESCP 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 Same as the CAL key.

MCL Deletes all data in memory.

MD:nnn Deletes weighing data with the data number nnn.

OFF Turns the display off.

ON Turns the display on.

P Same as the ON:OFF key

PT: . g 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.

?PT Requests the tare value.

Outputs the tare value set by the TR or PT: command.

PRT Same as the PRINT key

R Same as the RE-ZERO key

SMP Same as the SAMPLE key.

U Same as the MODE key

T Same as the RE-ZERO key

TR 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.

Z Same as the RE-ZERO key

ESCT Same as the RE-ZERO key

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

Commands to control the memory function

?MA Outputs all data in memory.

?MQnnn Outputs weighing data with the data number nnn.

?MX Outputs the number of weighing data in memory.

MCL Deletes all data in memory.

MD:nnn Deletes weighing data with the data number nnn.

UN:mm Changes the unit mass stored in memory with the number of mm (01-20).

?UN Outputs the unit mass number of the selected unit mass.

UW: . g Sets the unit mass value. e.g.,UW:+0.123 g (to set the unit mass to

0.123 g: represents a space.)

?UW Outputs the unit mass value of the selected unit mass number.

?ID Requests the ID number.

?SN Requests the serial number.

?TN Requests the model name.

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Commands to control the comparator function

HI: . g Sets the upper limit value. e.g.,HI:+2.34 g (to set the upper limit

value to 2.34 g: represents a space.)

LO: . g Sets the lower limit value. e.g.,LO:+1.23 g (to set the lower limit

value to 1.23 g: represents a space.)

?HI Outputs the upper limit value.

?LO Outputs the lower limit value.

Notes

“nnn” and “mm” indicate, respectively, three-digit and two-digit numerical values.

ESC : 1Bh in ASCII code

Before transmitting a command, add the terminator (<CR><LF> or <CR>), 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 <AK>

code or error code to each command as follows:

<AK> (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)

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18-3 Command Examples

ON command

R command

Standby mode

Zero display

All segments are displayed

Personal computer Time Balance

ON command

NCRLF

Command received

Command completed

AKCRLF

AKCRLF

O

All segments

Weighing mode

Zero display

In process

Personal computer Time Balance

R command

RCRLF

AKCRLF

AKCRLF

Command received

Command completed

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CAL command

Error code

Command received

Command completed

Zero display

Zero display

Personal computer Time Balance

CAL command

AC L CRLF

AKCRLF

AKCRLF

Weighing mode (unstable)

Weighing mode

Personal computer Time Balance

R command

RCRLF

AKCRLF

AKCRLF

CR

1LF

1E,CE

When the CAL command is

received, the balance returns to

the weighing mode

Error code

CAL command

AC L CRLF

In process

Command received

Command completed

When the R command can not be

achieved due to unstable weighing:

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Weighing with a tare

Sets the display to zero

Zero display

Personal computer Time Balance

R command

RCRLF

AKCRLF

AKCRLF

Place a container

Zero display

TR command

RCRLF

AKCRLF

AKCRLF

TTares

㹎 㹒 㸪 㸩 㸮 㸮 㸯 㸰 㸴 㸬 㸶 㸵 ࠉ ࠉ 㹥

㹑 㹒 㸪 㸩 㸮 㸮 㸯 㸮 㸮 㸬 㸮 㸮 ࠉ ࠉ 㹥

CRLF

S command

R

?PT command

P? T CRLF

In process

Command received

Command completed

In process

Command received

Command completed

(Net value)

(Tare value)

75

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

zero

Place a container

Zero display

Personal computer Time Balance

R command

CR

RLF

AKCRLF

AKCRLF

CRLF

g00001:TP .

PT:

command to set a target weight of 100 g

Before command

execution

AKCRLF

AKCRLF

Target weight display

Fill with sample until the

display becomes zero

In process

Command received

Command completed

Command received

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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.