User Manual

--SKA and SKB are only used to connect a ‘Maxi-MINDA’ receiver, TX-500 transmitter, or TX-600
transmitter to a PC for programming. During normal operation no connections should ever be
made to them.
--The ‘Data Received’ LED and the ‘AUX’ connector (if equipped) can also be ignored.
--The ‘Ext. DC Input’ connector is used to connect an external D.C. supply to the RX-500Maxi-
MINDA’ receiver. The voltage must be in the range of 10-16 volts D.C, (2.1mm plug, center pin
positive) (Radio Shack Part No. 273-1652).
--The ‘External Speaker’ connector, a 3.5mm mono jack socket, permits an external loudspeaker
to be used to produce the alarm tones in place of the internal speaker. Any external loudspeaker
connected to this socket must have an impedance of greater than 8 ohms in order to protect the
‘Maxi-MINDA’s amplifier circuitry against damage.
--The large terminal strip on the rear panel of the ‘Maxi-MINDA’ enables a variety of external
switching options to be achieved. It is, however,
strongly
recommended that the receiver always
be connected to an external D.C. supply if any significant current is to be drawn from Terminal
No. 8 (+9v out) of the terminal strip.
The internal ‘Maxi-MINDA’ circuitry immediately associated with the eight connections is as
shown in Figure 2:
The FET is switched ‘On’ whenever a ‘Red’ alarm signal from
any
of the four transmitter Unit
Identities is recognized by the ‘Maxi-MINDA’, and it will stay switched on until the alarm is
cancelled by pressing the ‘Reset’ button.
There is an internal relay available, which can be activated, if required, by this FET. To do this,
add a link between the ‘Output’ and ‘Relay’ terminals, and then the dry (fully isolated) relay
contacts are available as ‘Com’ (Common), N.C. (Normally Closed) and N.O. (Normally Open) on
the terminal strip. See Figure 3