The MU-4-434 is an embedded radio modem operated in the 434 MHz ISM band designed as the successor to the MU-2-R with improved in-band blocking performance. Dedicated commands, specially designed for wireless application, are provided for building a range of wireless system, from simple control systems to wide network systems. Using the commands, the user can concentrate on designing the application without needing to be aware of the radio protocol and control aspects. Reed-Solomon code is used for forward error correction (FEC) to maintain data integrity and provide highly reliable wireless communication. The MU-4-434 meets the requirements of the European RED Directive and carries the CE mark.
The relay feature allows you to extend the range by using additional units (up to 10 units)
PP sample available now
Serial Data Transmission with Simple, Dedicated Commands
The MU-4-434 uses Circuit Design’s unique simple, dedicated commands. Setting channels and all other controls can all be performed with commands.
Example 2: Changing the channel to 08
Note: The command transmission is the same for MU-2-R, however there exists timing differences between
MU-2-R and MU-4-434
Relay Function (Maximum 10 Stations)
You can make a relay with a maximum of 10 stations using the route command.
Example of transmitting data (ABCDE) to the target station with Equipment ID EI=04 via relay station 1 (EI=02) and relay station 2 (EI=03).
MU-4-434 and MU-2-R should not be used together when using relay or ACK function. For more information, please contact Circuit Design.
Reed Solomon Coding
One of several FEC block codes, it has strong error correction ability and the characteristic of correcting data errors caused by burst noise. Reed-Solomon codes are used in compact disks, satellite communications, and digital TV broadcasting
The MU-4-434 uses Reed-Solomon code for FEC, which reduces errors occurring due to burst noise and/or noise at low received signal level, and it improves the receive sensitivity of the equipment by more than 5 dB *1.
|Error correction protocol data format *2
||MU-4-434 data block
|MU-4-434 data component: 1 to 255 bytes variable
|Reed-Solomon code specification
||Code: RS (255, 247)
||1 – 32 bytes
|Primitive polynomial: X8 + X4 + X3 + X2 + 1
||33 – 64 bytes
|Error correction rate: 10% error or more
||224 – 225 bytes
*1 In interleave mode / Measured at Circuit Design, Inc.
*2 There are operation modes with or without error correction. Select the appropriate mode depending on the situation at the site and the application
How, When Does FEC Help RF Communication
VS Error in burst noise (Measurement conditions: 4,800 bps / Data size 4 bytes)
Error correction reduces influence from noise with is generated suddenly or is continuously generated at a dead point during mobile use with multi path.
VS Error in random noise (Measurement conditions: 4800 bps / Data size 32 bytes / Received signal level -114 dBm)
Error correction reduces influence from random noise which appears at a low received signal level
Target Station Receive Signal and Noise Level Acquisition
It is possible for the main station to acquire the signal and noise level of the target station some distance away. By using these values (and therefore calculating SNR), it is possible to evaluate the communication conditions during installation.