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21495344.indd/311007
The DRC-DR radio receiver can either be used with a DRC-10 hand-held transmit-
ter or with a DRC-J joystick control system.
3 General description
The DRC-DR radio receiver is designed as plug-in PCB that can be fitted in the
electrical equipment cover of the DR rope hoist. The radio receiver communicates
with the electrical equipment of the rope hoist via a CAN interface. For use of the
DRC-DR radio receiver, the DR rope hoist must be provided with a Demag rope
hoist control system.
Radio remote control systems of the DRC range are exclusively intended for
single-transmitter operation; i.e. there is always a clear assignment between a
specific transmitter and its corresponding radio receiver.
The so-called ISM band (433 MHz) is used for transmitting the radio signals
between transmitter and receiver. Witin the ISM band 30 frequencies are used
alternately in a defined sequence (so-called frequency hopping). A random-check
generator detemines the sequence of the frequencies when radio transmission is
started. In order to increase transmission reliability, the information is transmitted
several times. This method in connection with frequency hopping provides for a
very high immunity to interference.
Frequency hopping is used for the first time with Demag DRC radio control system
types D1-FH and D2. In the case of the D1 type, the frequency of the radio signal
is not changed during a transmission cycle.
A decisive advantage of the frequency hopping transmission is that existing in-
formation contents are transmitted on several physical channels. This redundant
radio transmission 1) provides for an exceptionally high insensitivity of radio
transmission against other transmitters or electromagnetic interference.
Radio receiver
DRC-DR
Hand-held transmitter
DRC-10
Joystick control system
DRC J
3.1 Transmitter/receiver
interface
3.2 Transmission method
1) Certain information contents are transmitted on up to 5 different frequencies. Only if (theoretically) all
frequencies used were occupied or disturbed by other radio systems, communication would be inter-
rupted.
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