User Manual

entirely automatically without disturbing the user unless he, or she, wishes to send a ‘Red’
alarm signal in the usual way.
IMPORTANT NOTES:
It is always possible that a ‘Maxi-MINDA’ receiver could miss a confidence
transmission from one of its associated transmitters if it coincides with a stronger transmission
from another unit or because of local radio interference. The risk of such a false alarm can be
reduced by programming the receiver Loss-of-Signal Threshold time to be a few seconds more
than twice the Confidence Repeat period of the transmitter(s).
For example, if the transmitter sends an automatic confidence signal every five minutes, a ‘Lost
Signal’ alarm period of about ten and a quarter minutes should be programmed into the receiver.
This will allow one confidence transmission to be missed by the receiver and not cause an alarm
signal to be produced.
If more than one transmitter (of the four possible) operating with a ‘Maxi-MINDA’ receiver has
been programmed to send confidence signals more frequently than about every 5 minutes, there
is a likelihood of these transmissions overlapping occasionally and one or other of them not being
decoded by the receiver. The likelihood of serious interference can be reduced significantly if
each of the transmitters is programmed with different Confidence Repeat intervals, since any two
signals clashing on one occasion will not do so the next time around.
DISABLING THE PIEZO ALARM
The alarm signals produced by the piezo beeper can, if required, be switched off altogether by
moving an internal switch. To access it, carefully open the RX-500 ‘Maxi-MINDA’ receiver's case
and look for the small switch on the rear of the front panel PCB, between the blue piezo beeper
and the right-hand ribbon connector. When the slider is in the down position (nearer to the bottom
of the case) these tones are enabled - to turn them off move it in the opposite direction (i.e.
towards the beeper).
NOTE:
Remember that when this switch is ‘up’ (tones
disable
d), the only audible alarm signals
generated will be those produced by the RX-500 ‘Maxi-MINDA’s internal audio power amplifier
and loudspeaker, and these will only be present as long as the receiver is powered from an
external supply.
EXTERNAL CONNECTIONS
The rear panel of the ‘Maxi-MINDA’ is shown in Figure 1 below: