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Embedded low power radio modem
MU-1-R 434MHz

The radio modems used with this program are the MU-1 1252MHz* for the Japanese market.
*Note: The MU-1-R 434MHz is prohibited for use in Japan by the Radio Law.


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Using this program you can evaluate the communication functions of the MU-1 from your own personal computer via the Internet.
You can directly experience actual data communication using radio between two MU-1 units that are located at Circuit Design, Inc., Japan. The MU-1 units controlled by the program are 1252MHz MU-1 LAN units for the Japanese market, and the radio transmission rate is 9,600 bps.

There is only one set of MU-1 units (2 units) available at Circuit Design for this service.
In order to allow as many users as possible to try out the evaluation, access time is limited to 10 minutes each time. After 10 minutes, the program finishes automatically. If one of the programs cannot connect to the system, both programs stop automatically. Please try reconnecting again after 10 minutes.

Thank you for your understanding and cooperation.

In some cases you may not be able to access the program due to network issues at your location. Please contact your network administrator.

    Data is sent twice from MU-1 Unit 1

● Communication Screen 1

When you enter a command in the command line and click the Transmit Command button, the command (@) that you issued and the command response (*) are displayed on the monitor.
At the same time the data is sent to Unit 2.

Issue the data transmit command to transmit 30 bytes of ‘?’ characters from equipment number 1.


   Data is received twice by MU-1 Unit 2

● Communication Screen 2

This is the screen when the data is received from equipment number 1.
The received data is invoking the receive response.
When you make an actual program, the data is processed in order from (*).


‘1E’ indicates the received data size, and as a decimal it means 30 bytes. ‘1E’ consists of ASCII characters so a process is necessary to convert it into a numerical value.

● Air Monitor Screen

If you click the Air Monitor Start button, the MU-1 acquires the RSSI level for approximately 1 second for each channel, displaying the levels as a graph.br /> The screen is the air monitor for the MU-1 for the Japanese market. The MU-1-R 434MHz has 64 channels.

Explanation of the Program

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Control programs run for each of the screens shown above for the two MU-1 units. Because the MU-1 is a transceiver modem that can communicate two-way, either program can issue commands equally.

Please gain a basic understanding of how to use the MU-1 from the manual before using the online evaluation.

 MU-1-R 434MHz Operation guide

● Click the buttons in the ‘@GI’ and ‘@RA’ columns to display the commands in the command line. Click the Transmit Command button. You can also enter commands directly in the command line and issue them by pressing the Enter key.

● In order to protect the system, the buttons in the ‘@UI’ column will not actually write the commands in the MU-1 units. By clicking these buttons you can read the internal status of the units. In this case it is not necessary to click the Transmit Command button.

● Clicking the Create Transmission Data button creates a data transmit command with the characters specified in Data and the number specified in Size.

● Clicking the Create ACK Request Transmission Data button creates a data transmit command that requests the return of an ACK signal from the target station.

● Clicking the Create Packet Test Command button creates a command that sends the created character string to the target station and returns the character string without modification.

● Clicking the Hex checkbox displays the commands, responses and receive responses as hexadecimal numbers.

● If you click the Air Monitor Start button, the MU-1 acquires the RSSI level for approximately 1 second for each channel, displaying the levels as a graph. When the air monitor is running, only the Air Monitor Stop button can be operated. While one of the programs is running the air monitor, if you click the @CT01 button in the other program, test waves are emitted for 10 seconds only, and the results are displayed on the air monitor screen. *Since the units are located very close to each other, adjacent channels are affected, but this is not abnormal. This is not a problem for actual operation of the equipment.

● To reset all the settings, click the Reset @SR buttons in both programs. The values of the MU-1 parameters after resetting are as follows. @BR=57600、@SB=01、@PB=NO、@CH=0B(11ch)、@UI=0000、@GI=00、@EI=01、@DI=01

● When the connection is made, the elapsed time is displayed above the Quit button. If you have finished your evaluation before the 10 minutes elapses, please quit the program to allow other customers to access the evaluation.

● To quit the program, click the Quit button on either of the screens. Both screens close. *Restrictions 1. If another customer is using the program, an error occurs. Please quit the program and try again after 10 minutes. 2. It is not possible to issue write commands related to basic operation of the MU-1 (@UI, @BR, @PB etc.). By clicking these buttons you can read the settings of the units. 3. There are some commands that are not permitted with this system (@IZ, @SY etc.). 4. The ‘/W’ command option that fixes the values in the EEPROM cannot be used.

How to Run the Program

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Download the zipped program file to a suitable folder and decompress it.
Double click the JAR file in the decompressed MU1_EV-e folder to start up the program.
The program automatically attempts to connect to the MU-1 at Circuit Design, Inc. Japan.

Program folder name: MU1_EVe
Program file name: MU1_EVe.jar

1. The Java Runtime Environment version 5.0 is required to run the program.

Download: http://www.java.com/en/download/index.jsp

2. The JAR file itself is also a compressed file. If double clicking the file starts the decompression mode, please set your archiving utility to exclude JAR files from decompression.


1. Since the MU-1 is connected via the Internet, complete control of the MU-1 may not always be achieved.
2. If a communication error occurs, restart the program.
3. Please do NOT issue commands other than those specifically for the MU-1.
4. Please do not attempt unlawful access.

About the System
The system is configured as follows.

1. The modem used is the 1252MHz band MU-1 LAN interface kit MU1-LIK for the Japanese market. The MU1-LIK comes with the Lantronix XPort device server. The program is controlled using TCP/IP, and a virtual COM port is not used.

2. The transmitted power of the two MU-1 units is 10mW, and the communication range is about 50cm. Therefore there is no attenuation of the electric field intensity.

3. The MU-1 units are located in an environment with a relatively high level of noise from computers and the like, so they show high floor nose level.

4. Programming language: Java

Enquiries and Comments
Please address any enquiries by e-mail or phone to Circuit Design.

In addition, please send any comments you may have to the e-mail address shown below.

E-mail address: info@circuitdesign.jp

Telephone: ++81-263-82-1024

Copyright for the program belongs to Circuit Design, Inc. Please do not copy or distribute the program.

Circuit Design will accept no responsibility whatsoever for any damages that may arise from use of the program. The program is used at your own discretion.

How to Obtain the Program
If you consent to the terms of the Disclaimer above, you may download the program. I consent to the terms of the Disclaimer.


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  I consent to the terms of the Disclaimer.


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