USB Load Cell

Computer Connection
Communication Manual

1WMPD4004792

1.

Overview

A USB load cell is a load cell calibrated with the physical quantity of force. By connecting it to a computer by USB cable, you
can easily perform measurement. This manual explains the connection of this product to a computer and communication
between them.

2.

Software for the Measurement

By using the “WinCT-DLC” software for measurement, measurement data can easily be confirmed on a computer.
“WinCT-DLC” can be downloaded from the A&D homepage.

3.

Specifications

A/D conversion rate

100 times/sSelect from None, 0.7, 1.0, 1.4, 2.0, 2.8, 4.0, 5.6, 8.0, 11.0 Hz

Digital filter(Default value: 1.0 Hz)

Communications standard

Conformed with USB Ver. 2.0 (Full Speed)

Baud rate

38400 bps

Character bit length

8 bitsCommunication

ParityEvensettings

Stop bit length

1 bit

Terminator

CR LF

CodeASCII

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4.

Connecting to the Computer

The procedure to connect this product to a computer is also described in the ”USB Connection Instructions” on the A&D
homepage. Please refer to it along with this manual.

4.1. Operation Procedure1) Connect a USB cable to a computer.
2) Select the Device Manager on the computer.
3) Click the “Ports (COM & LPT)”.
4) Confirm the COM Port number displayed. The numerical value indicated by x in “USB Serial Port (COM x)” indicates theCOM Port number. If multiple load cells are simultaneously connected to the computer without confirming the COM Port
number, COM Port identification becomes difficult. Confirm the COM Port number one by one beforehand when connecting.

4.2. If the Driver Cannot Be Installed Successfully
By connecting the load cell to the computer, the driver installation is automatically installed over a period of a few minutes,
and then the COM port number is displayed. If the COM port number is not refreshed even after some time has passed, thatmay indicate a failure in installing the driver. If such an error occurs, refer to the website of Future Technology Devices
International. Ltd. to install the driver.

4.3. Changing the Communication Latency Timer
This product is capable of sampling at a rate of 100 times/s (10ms period). When the communication latency timer is set
above 10ms, a communication delay may occur. To avoid this, set the communication latency timer as follows. The system
may be unstable depending on the PC environment. In that case, change the setting to the previous one.
1) As is done in "0.
2)3) Operation Procedure", select the “USB Serial Port (COM x)” in the "Device Manager" and open the “Properties”.
4) Select the “Port Settings” tab and then select the “Advanced”.
5) Set the Latency Timer (msec) in the "BM Options" under 10 (recommended value is 3 ).

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5.

Commands List

5.1. Reading Commands
Items

Host side transmission command

Floating point typemeasurement
value reading

RFMV<CR><LF>

Floating point typemeasurement
value sequential
reading

RCFM<CR><LF>

Floating point typesection peakreading

RFPK<CR><LF>

Floating point typesection bottom
reading

RFBT<CR><LF>

Fixed point typemeasurement
value reading

RLMV<CR><LF>

Load cell side response command
RFMVXXXXXXXX<CR><LF>(XXXXXXXX is the floating point type measurement value(HEX))
Response example:
When measurement value is 100N
RFMV42C80000<CR><LF>(42C80000 = 100 (Decimal digit))
RCFMXXXXXXXX<CR><LF>(XXXXXXXX is the floating point type measurement value(HEX))- Keep outputting until the sequential reading stops or thepower is turned off.
- Only the stop sequential reading command can bereceived while outputting.
- Output rate is confirmed by the number of output updates.
Response example:
When measurement value is 100N
RCFM42C80000<CR><LF>(42C80000 = 100 (Decimal digit))
RFPKXXXXXXXX<CR><LF>(XXXXXXXX is the floating point type section peak value(HEX)) *1
Response example:
When section peak value is 100N
RFPK42C80000<CR><LF>(42C80000 = 100 (Decimal digit))
RFBTXXXXXXXX <CR><LF>(XXXXXXXX is the floating point type section bottom value(HEX)) *2
Response example:
When section bottom value is 100N
RFBT42C80000<CR><LF>(42C80000 = 100(Decimal digit))
US,XXXXXXXXX□□N<CR><LF>(XXXXXXXXX is the fixed point type measurement value(DEC), and □ is a space (0x20))
Response example: *3
When measurement value is 100N
US,+0100.000□□N<CR><LF>

3Items

Host side transmission command

Fixed point typemeasurementvalue sequentialreading

RCLM<CR><LF>Fixed point typesection peakreading

RLPK<CR><LF>

Fixed point typesection bottom
reading

RLBT<CR><LF>

Digital filter
setting reading

RDGF<CR><LF>

Number ofoutput updates
setting reading

RSMR<CR><LF>

Load cell side response command
US,XXXXXXXXX□□N<CR><LF>(XXXXXXXXX is the fixed point type measurement value(DEC), and □ is a space (0x20))- Keep outputting until the sequential reading stops or
the power is turned off.
- Only the stop sequential reading command can bereceived while outputting.
- Output rate is confirmed by the number of output
updates.
Response example: *3
When measurement value is 100N
US,+0100.000□□N<CR><LF>
US,XXXXXXXXX□□N<CR><LF>(XXXXXXXXX is the fixed point type section peak value (DEC),and □ is a space (0x20)) *1
Response example: *3
When section peak value is 100N
US,+0100.000□□N<CR><LF>
US,XXXXXXXXX□□N<CR><LF>(XXXXXXXXX is the fixed point type section bottom value(DEC), and □ is a space (0x20)) *2
Response example: *3
When section bottom value is 100N
US,+0100.000□□N<CR><LF>
RDGFXX<CR><LF>(XX is the setting value of the digital filter)- Relationship between setting value and cutoff
frequency
Setting value: cutoff frequency
00: None
01: 11.0 Hz
02: 8.0 Hz
03: 5.6 Hz
04: 4.0 Hz
05: 2.8 Hz
06: 2.0 Hz
07: 1.4 Hz
08: 1.0 Hz (Default value)
09: 0.7 Hz
Response example:
When setting value is 1.0 Hz
RDGF08<CR><LF>
RSMRXX<CR><LF>(XX is the setting value of the number of output updates)- Relationship between setting value and number ofoutput updates
Setting value: Number of output updates
01: 1 time/s
02: 10 times/s (Default value)
03: 50 times/s
04: 100 times/s
Response example:
When setting value is 10 times/s
RSMR02<CR><LF>

4Items
Model namereading

Rated capacity
reading

Serial number
reading

Software version
reading

Host side transmission command

RMOD<CR><LF>

RRAC<CR><LF>

RSER<CR><LF>

RVER<CR><LF>

Load cell side response commandRMODXXXXXXXXXXXXXXX<CR><LF>(XXXXXXXXXXXXXXX is the model name)Response example:
Model name is LCCU21N100RMODLCCU21N100□□□□□<CR><LF>□ is a space (0x20)
RRACXXXXXX<CR><LF>(XXXXXX is the rated capacity)
Response example:
Rated capacity is 100N
RRAC000100<CR><LF>
RSERXXXXXXXXX<CR><LF>(XXXXXXXXX is the serial number)
Response example:
Serial number is 6A7300000
RSER6A7300000<CR><LF>
RVERXXX<CR><LF>(XXX is the software version)
Response example:
Software version is 100
RVER100<CR><LF>*1 About the section peak value
This is the maximum value of A/D converter sampling at a section between receiving the prior and next section peakreading commands. (The first time when turning the power on, a section from turning on the power to receiving thesection peak reading command)
Example) Section peak reading
Section peak reading→ Section peak value ●(maximum value of section 1)
Section 1

Section peak reading→ Section peak value ▲(maximum value of section 2)
Section 2

Section peak reading→ Section peak value ■(maximum value of section 3)
Section 3

ForcechangeForceTime5(Dotted lines: A/D converter sampling)*2 About the section bottom value
This is the minimum value of A/D converter sampling at a section between receiving the prior and next section bottomreading commands. (The first time when turning the power on, a section from turning on the power to receiving thesection bottom reading command)
Example) Section bottom reading
Section bottom reading→ Section bottom value ●(minimum value of section 1)
Section 1

Section bottom reading→ Section bottom value ▲(minimum value of section 2)
Section 2

Section bottom reading→ Section bottom value ■(minimum value of section 3)
Section 3Forcechange
ForceTime(Dotted lines: A/D converter sampling)*3 Response of the fixed point type reading
The number of digits after the decimal point is different depending on the rated capacity.
Rated capacity

The number of digits

Response example ( □ = space)after the decimal point
1 or greater

Less than 10

5US,+01.00000□kN<CR><LF>
US,+09.80665□□N<CR><LF>

10 or greater

Less than 100

4US,+001.0000□kN<CR><LF>

100 or greater

Less than 1000

3US,+0001.000□kN<CR><LF>

US,+098.0665□□N<CR><LF>
US,+0980.665□□N<CR><LF>
1000 or greater

Less than 100002

US,+00001.00□kN<CR><LF>
US,+09806.65□□N<CR><LF>

10000 or greater

Less than 100000

1US,+000001.0□kN<CR><LF>
US,+098066.5□□N<CR><LF>

65.2. Setting Commands
Items

Host side transmission command

Load cell side response command

SDGFXX<CR><LF>(Write a setting value in XX)- Relationship between setting value andcutoff frequency
Setting value: cutoff frequency
00: None
01: 11.0 Hz
02: 8.0 Hz

SDGFXX<CR><LF>

03: 5.6 Hz

Digital filter setting(XX is the setting value)

04: 4.0 Hz
05: 2.8 Hz
06: 2.0 Hz
07: 1.4 Hz
08: 1.0 Hz (Default value)
09: 0.7 Hz
Transmission example:
When setting value is 1.0 Hz
SDGF08<CR><LF>
SSMRXX<CR><LF>(Write a setting value in XX)- Relationship between setting value
and number of output updates
Setting value: number of output
updates

SSMRXX<CR><LF>

01: 1 time/s

Number of output updates setting

02: 10 times/s (Default value)(XX is the setting value)

03: 50 times/s
04: 100 times/s
Transmission example:
When setting value is 10 times/s
Stop sequential reading (For stopping theoutput of floating point type measurement
value sequential reading or fixed point typemeasurement value sequential reading)

SSMR02<CR><LF>
STOP<CR><LF>

STOP<CR><LF>

5.3. Response When Command Error Occurs
Items

Load cell side response command

Format error? <CR><LF>

Setting value error

V <CR><LF>

6.

LED Display

Orange………TX (sending),

Yellow………RX (receiving),
7

Blue………Power (power supply)

7. Back cover: A&D Global

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