MRA1-MRA2
MRA1E-MRA2E
ENGLISH
ISMRAEEU_09_02.DOC
1.
GENERAL INFORMATION
These receivers integrate the functions of standard Multipass and Multipass Roll code receivers and decoders.
They feature a storage capacity of up to 200 different codes generated by transmitters of the Multipass and Multipass Roll family at 40,685 MHz
(MRA1– MRA2) and at 433 MHz (MRA1E - MRA2E).
2.
ROLLING CODING
This type of coding affords extra security as it prevents the risk of code violation by interception or re-transmission. It is based on the
transmission of a batch of bits consisting of a fixed part (which is different for each transmitter), of channel bits associated with the switch of the
activated transmitter, and of a part which changes in a pseudo-random manner (rolling code) in accordance with a proprietary Prastel algorithm.
The configuration of these latter bits changes unpredictably from one transmission to the following. The receiver memorises by self-learning the
fixed part of the code associated with each transmitter plus the relevant rolling code, updating the latter upon each transmission. Transmitter
recognition occurs only if the transmitted rolling code corresponds to the 255 configurations subsequent to the last recognised transmission.
Realignment and recognition of a previously memorised transmitter which has overrun the permissible interval (an event which may occur for
example following on an excess of unrecognised transmissions or upon battery replacement) can however be made by pressing and releasing
the transmitter learning button. This procedure permits the system to check for code correctness, while safeguarding the advantages afforded
by the rolling code.
3.
TECHNICAL FEATURES
Power supply
12 - 24 Vac/dc
Average consumption
stand-by: 20 mA with relay energized: 45 mA
Reception frequency (mod. MRA1E – MRA2E)
433 MHz
Reception frequency (mos. MRA1– MRA2)
40,685 MHz
Digital Code
with a number of bits varying from 40 to 54
Number of storable codes
200
Number of channels
1 (MRA1– M/RA1E); 2 (MRA2 – MRA2E)
Type of output
monostable, bistable
Output
Relay
Contact rating
0,5 A @ 24 Vac/dc
Signals
red LED
Working temperature range
-20/+55 °C
Storage temperature
-40/+85 °C
Receiver weight
250 g.
Receiver dimensions
77 x 80 x 38 mm
4.
VOLTAGE SELECTION
Both the MRA1-MRA2 and the MRA2E-MRA1E receivers can operate at 12/24 Vac/dc.
5.
CODE PROGRAMMING AND DELETION
Entry and storage of a new code and deletion of the full code list can be made by acting on key P1,
while deletion of single user codes can be made using the GTBASER portable terminal.
How to Program
•
Power the receiver as specified.
•
Press P1. The red LED lights up indicating that programming is in progress.
•
Press any of the transmitter’s keys to make a transmission.
•
The code will now be entered in the memory. While loading is in progress, LED will flash. Upon code being stored, the LED stops flashing
and becomes fixed. A new code can now be entered.
•
Load the codes of all the transmitters by making a transmission with each of them.
•
Upon this operation being completed, press P1 again to exit from programming mode. The LED will go off. In any case, the system will
automatically exit from programming mode upon 10 seconds having elapsed since last loading.
Note: Codes remain stored even if receiver is powered off.
Attention: Make a transmission within 10 seconds after pressing P1 as system will automatically exit from programming mode after this time
has elapsed if no transmission has been made.
To re-access programming mode, press P1 again.
Deletion of all codes
•
Press and hold down key P1 until the red LED starts flashing.
•
Press P1 again within 6 seconds to confirm deletion. Confirmation is signalled by the LED flashing more rapidly.
6.
CHANNEL SELECTION AND RELAY OPERATING MODE
Set output as desired by means of jumper A (jumper A closed for monostable relay operation and jumper A open for bistable relay operation).
Note: Relay operating mode selection is not contemplated on the MRA2 – MRA2E receivers.
7.
ANTENNA CONNECTION
The receivers may be connected to external antennas of corresponding frequencies by means of the appropriate F-type female connectors.
In particular, the MRA1and MRA2 receivers can be connected to ANTFK4 and ANT40,6 type antennas or the like.
The MRA1E and MRA2E receivers can instead be connected to ANT433SD type antennas, to the wire antenna provided or the like.
DECLARATION OF CONFORMITY
Prastel S.p.A. declares that the following equipments: RECEIVERS MRA1, MRA2, MRA1E, MRA2E ARE IN ACCORDANCE with the 99/05/EC (R&TTE)
direcitve
