3
Applied Wireless Inc.
Switch Follower
Model SF900C4 or SF900C8 Pair
Two-Way Remote
Model SFT900C4 Transmitter with SF900C4 Receiver
or SFT900C8 Transmitter with SF900C8 Receiver
Product Descriptions
The SF900C Series switch followers are a two way system designed to provide a
quick and cost effective solution for a variety of wireless switching applications.
Each unit has 4 or 8 inputs connected to a transmitter and 4 or 8 10 Amp SPDT
relay outputs connected to a receiver. They are transceivers designed to work in
pairs, the output relays at the
far
unit will “follow” the inputs at the
near
unit and
vice versa.
For the SF900C Pair, an optional
loopback
mode can be wired for each channel
separately. At the RECEIVE end the relay output can be wired to activate the
units corresponding input. This will close the corresponding relay at the
originating TRANSMIT end confirming the switch change was carried out at the
RECEIVE end.
The inputs are opto-isolated and may be operated by an applied voltage that can
be supplied by a power source from 5 to 24 Volts AC or DC through a switch
contact, relay, sensor, PLC output, etc.
Alternatively, instead of automatic switch following operation, the SF900C can
operate as a 4 or 8 channel wireless relay using a SFT900C 4 or 8 button
handheld remote control. When a button is pushed on the SFT900C, a beep will
indicate that the proper relay was triggered in the SF900C. In this configuration,
the SF900C is always in the loopback mode. With optional software, latched,
momentary and toggle mode outputs are available.
These products utilize frequency hopping spread spectrum technology and are
immune to interference and multipath fading. All inputs and outputs are
independently isolated from each other and from the power supply and ground.
Expected range with these products is 3 miles*. The receiver requires 12 to 24
Volts AC or DC (supply not included).
* Unobstructed, straight line-of-sight range, when used with the standard antennas
included with the SF900C pair.
4
Installation Instructions
Before Beginning the Installation
Plan your installation carefully. The physical location and orientation of the unit
will have a significant influence on reception, particularly at longest ranges. For
best results,
the antennas should be positioned vertically (pointing either up
or down).
If necessary, use double-sided foam tape or hook & loop fasteners
(not supplied) to secure the unit to a
non-metallic
vertical surface. Also, keep in
mind that the RF signal from the unit will travel through most non-metallic
building materials (wood, stucco, brick, etc.), however
maximum stated reception
range is based on unobstructed line of sight conditions.
LEARN PROCEDURE
STANDARD TWO WAY APPLICATION: To pair two SF900C units, place both
units in the learn mode by pushing their respective learn buttons. The learn lights
will flash. Let’s call one the Base unit and the other the Remote unit. The second
push of the learn button on the Remote unit will trigger the learning process. Once
completed, the learn lights will turn Off. The Remote unit will have learned and
adopted the code and frequency of the Base unit. The Base unit is defined as the
unit that has not adopted an alternate code. The distinction is important for the next
example.
RECEIVER/TRANSMITTER APPLICATION: To pair a SF900C to be used as a
receiver with a SFT900C handheld transmitter, the case of the SFT900C will have
to be removed to access the learn button. Remove the 4 screws from the back cover
and remove it. Place both units in the learn mode by pushing their respective learn
buttons. The learn lights will flash. Then press the learn button on the SFT900C
handheld transmitter again and the pairing will take place. Replace the cover. The
SFT900C Remote unit will have learned and adopted the code and frequency of the
SFT900C Base unit. Other transmitters can be added one at a time by using the
SF900C as the base unit by repeating the learn process. All of the transmitter will
have learned and adopted the SF900C Base unit's code and frequency.
More SF900C receivers can be added to the above system one at a time by using the
same SF900C as the Base unit. However, the covers will have to be removed from
the additional SF900C receivers and the ACK jumper will have to be moved to the
NO ACK position to disable acknowledgements. When a signal is received from a
transmitter, only one receiver, logically the Base unit, must reply with an
acknowledgment to avoid collisions.
