The MU-D1-R is an FCC part15 compliant embedded low power radio modem for transmission of serial data. Since
it is possible to control the radio component using dedicated simple commands, the user can concentrate on
developing the transmitting and receiving programs for their system.
The commands of MU-D1-R are compatible with the commands used for Circuit Design’s MU-1 and MU-2 series.
Transmitting and receiving data and issuing commands are performed using a UART*
1
interface with a single-chip
CPU and the modem can also be controlled via the COM port (RS232C format) of the computer, making it possible
for the user to develop systems quickly*
2
.
The receiving part contains two independent receivers and operates as a true diversity receiver which provides
stable receiving performance even in proximity operation prone to multipath effect.
The MU-D1-R is designed to minimize design difficulties involving high frequency components, so that the user can
embed the modem in their system with peace of mind.
Important
It is not possible simply to replace communication using existing RS232C system equipment connected
with a cable, with MU-D1-R wireless communication. In order to build wireless systems, issues specific to
radio communications must be solved. The hardware and software must be newly designed specifically
for the MU-D1-R.
*1 UART (Universal Asynchronous Receiver Transmitter)
*2 The RS232C interface board with a D-Sub 9-pin connector is available
1.1.1 Features
FCC part15.247 compliant
Command compatible with the MU-1 and MU-2 series
Serial data can be transmitted with a simple system of commands.
Offers a wide communication range with stable operation.
The true diversity receiving system achieves stable communication
The transceiver function is incorporated within a compact unit.
Ideal for battery operated applications thanks to operation at low voltage and low consumption current.
Uses the UART interface commonly available with on-board CPUs.
The high frequency circuit is designed specifically as an embedded radio unit, to operate stably on the user
system circuit board.
1:1, 1:N, and N:N systems can be built by flexibly setting link parameters.
It is possible to assess locally the status of radio waves and field noise at the source station.
RF power selectable by switching the power amplifier ON/OFF (40 mW / 8 mW)
Using a TCXO in the control part achieves a wide operating temperature range from -20
ºC to 65 ºC
1.1.2 Applications
Serial data transmission
Energy monitoring, data monitoring devices, handy terminals, barcode readers, housing equipment control
Telecontrol
Various warning systems, remote control for construction machinery, display devices, motor control, lifters
Remote control of FA equipment
Telemetry
Security systems, water level monitors for rivers and dams, temperature and humidity gauges, rain gauges,
pressure gauges, voltmeters, ampere meters
Chapter 1 The MU-D1-R
1.1 Outline
