Installation Instructions
Occupant Copy
2
Types of Interfaces
There are three different models of the
RadioTouch
switch closure interface:
RTA-MO-MA-SCI, RTA-MO-TG-SCI, and
RTA-MA-24VDC-SCI.
• The
RTA-MO-MA-SCI
is a momentary to
maintained switch closure interface. This
control can receive two momentary switch
closure inputs from the
RadioTouch
controller.
This interface transforms a momentary switch
closure input into a maintained low-voltage
switch closure output. Upon receiving a
momentary low-voltage switch closure input
from the first switch closure the interface
closes an internal switch, thus producing a
maintained closure to the attached equipment.
Upon receiving a momentary switch closure
input from the second switch closure the
interface opens the internal switch, thus
breaking the circuit controlling the attached
equipment. This technology can provide two
button on/off or up/down control to a variety of
electronic devices (see Figure 1).
• The
RTA-MO-TG-SCI
is a momentary to
toggle function switch closure interface. This
control can receive a single momentary switch
closure input from the
RadioTouch
controller.
Upon receiving the input, the interface toggles
the internal low-voltage switch to its opposite
state, thus completing or breaking the circuit
controlling the attached device. This
technology can provide single button on/off or
up/down control to a variety of electronic
devices (see Figure 2).
• The
RTA-MA-24VDC-SCI
is a maintained
switch closure interface when 24 V
is applied
to it. This control is used to set up backup/
emergency lighting using at least two
RadioTouch
controllers in an application where
backup/emergency lighting is desired and there
is a backup/emergency power source. In each
room there will have to be a designated fixture(s)
with a
RadioTouch
controller powered from
normal power (Unit A) and a designated
fixture(s) controlled by one
RadioTouch
controller connected to the backup/emergency
power source. The
RadioTouch
controller that is
connected to the backup power will be
designated as the backup/emergency controller
(Unit B) and the lights connected to it will be the
backup/emergency lights for that area. The
backup/emergency controller must have DIP
switch number 2 in the down position and
cannot have an occupant sensor connected to it
in the standard manner (see Figure 3). For more
information on indirectly controlling a
backup/emergency controller with an occupant
sensor, see application note #137 at
www.lutron.com. The RTA-MA-24VDC-SCI will
be wired between one of the
RadioTouch
controllers in the area and the
backup/emergency powered
RadioTouch
controller(s). The
RadioTouch
controller that is
connected to normal power and is providing
power to the RTA-MA-24VDC-SCI will not be
able to power any occupant sensors. This unit’s
power supply is derated to 15 mA which will
allow one daylight sensor to be connected (see
Figure 4).
