User Manual

recognized and decoded. All intelligent TX-500 Keyfob or TX-600 Belt transmitters will
automatically transmit a signal long enough for this to occur. Possible problems when using a
MINDA TX-400 transmitter can be eliminated by ensuring the transmit button on the keyfob is
always pressed for at least one second.
As supplied, unless a customer has requested otherwise, an RX-500 ‘Maxi-MINDA’ receiver
normally has its battery economizer
enabled
while it is operating on its own internal battery and
disabled
(i.e. receiver runs continuously) once external supplies are present. This arrangement
can be changed at the factory, if required, by re-programming the receiver.
EXTERNAL POWER SOURCES
If an external power source of greater than 10 volts, and of correct polarity, is connected to the
Maxi-MINDA’ RX-500, the receiver will automatically use this supply in preference to its internal
battery. If for any reason the external supply fails (possible due to AC supply failure) the unit then
reverts to its internal battery and continues operating normally.
TX UNIT IDENTITIES
A ‘Maxi-MINDA’ receiver can be configured (by re-programming) to respond in different ways and
with different timings to each of the four possible transmitter Unit Identities (1, 2, 3 or 4), to suit
particular operational needs
‘RED’ AND ‘GREEN’ ALERTS
When the ‘Maxi-MINDA’ receiver is operating and a valid signal is received from a transmitter with
the same Family Identity Code, the appropriate red or green LED on the receiver will light and an
audible pulsed tone alarm will be heard. The tempo of this pulsed tone is faster for a ‘Red’ alarm
than for a ‘Green’ alarm, thereby facilitating the aural discrimination between urgent and non-
urgent transmissions.
When the ‘Maxi-MINDA’ is using its internal battery the alarm tone is produced by a piezo beeper.
When an external power supply is being used an additional high power amplifier driving an
internal loudspeaker is automatically enabled. The loudness of the alarm signals produced by the
piezo beeper cannot be adjusted. If desired, the beeper can be switched off completely so that all
audible alarms are produced only through the loudspeaker with their loudness (from silence to
full-volume) being adjusted by means of the front panel volume control. To turn off the beeper
refer to the paragraph entitled ‘Disabling the Piezo Alarm’, but note that this should only be done
when the receiver is always to be powered from an external source.
In some operational situations it may be desirable for the ‘Maxi-MINDA’ receiver to remain silent
whenever a ‘Green’ signal is received and only produce an audible alert on receipt of a ‘Red’
alarm signal. How the receiver responds to these signals is programmable and can also, if
required, be made switch-selectable for use by the operator. As supplied, unless a customer has
requested otherwise, an RX-500 ‘Maxi-MINDA’ receiver has a ‘Green Alarm’ switch on the front
panel, adjacent to the ‘On/Off’ switch, which enables an operator to select whether or not a
‘Green’ alarm signal is accompanied by an audible warning signal.
TRANSMITTER LOW BATTERY ALERT
Once the battery in any of the transmitters being used falls in voltage such that it is in need of
replacement, all subsequent transmissions sent by that unit will be ‘tagged’ to this effect until the
battery is replaced.
Once this tagged signal has been detected by the ‘Maxi-MINDA’ receiver, its LED indicator
corresponding to that transmitter Unit Identity will start to blink out briefly about once per second.
Note that a transmitter whose battery has become completely discharged can NOT send the low-
voltage warning.