ABACOM Technologies RF-LPS User manual

The RF-LPS is a low power RF controlled switch which draws only 90µA! Primarily intended as a remote
controlled device for battery saving applications, the RF-LPS is designed to remotely connect and dis-
connect the (battery) power supply to a connected device. The RF-LPS is used in conjunction with the
2CH-REML two channel RF remote transmitter. Pressing the GREEN button on the remote will cause
the RF-LPS to pass the external (battery) power supply of the connected device, turning it ON. Pressing
the RED button interrupts the external (battery) power to the connected device, turning it OFF. The RF-
LPS is constantly powered by two internal Lithium-Ion batteries lasting up to sixteen months. The RF-
LPS is ideal as a power saving (retrofit) interface for applications that are usually constantly powered, but
are not being used for continuous duty.
Features
•Low current consumption (typically 90µA)
•Long battery life: continuous operation up to
16 months off internal batteries
•Switches any supply from 5Vdc to 35Vdc
•Can switch external loads up to 400mA
•For higher currents, a relay may be used to
switch the power supply
•Simple series connection between load
power supply and load device
•Works in conjunction with the 2CH-REML
handheld RF remote radio transmitter
•Operates on 433.92MHz
•Receiver has -94dBm sensitivity
•Open Field Range of up to 400 feet
•8 bit selectable address
Typical Applications
•Low power remote switch
•Switch devices ON/OFF in areas which are
difficult to reach
•Conserve battery power in remote locations
*90µA* Low Power RF Controlled Switch
RF-LPS
External DeviceSupply
Without the RF-LPS, the remote device is constantly on, drawing maximum current.
With the RF-LPS, the supply is switched to the load via RF remote control.
When OFF, the supply drain is only 90 microamps !
External Device/LoadLoad Supply O/PRF-LPSSupply
OFF
ON
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80mm
40mm
Height: 20mm

Connecting the RF-LPS
The RF-LPS is patched in series between the load devices power supply and the load device.
Simply connect the external power supply to the ‘Supply In’ jack on the RF-LPS and plug the out-
put of the RF-LPS in to the supply input of the desired load or device. If the device being switched
through the RF-LPS draws more than 400mA, the RF-LPS output can be used to drive a relay
whose contacts can switch the supply to the load device. The output of the RF-LPS is an open
collector output and includes an internal fly-back diode which is necessary when controlling a re-
lay. The figures below show the open collector output and the method for connecting a device and
a relay.
Replacing Batteries
The RF-LPS uses two coin type Lithium-Ion 2450 series batteries. To replace, open the enclosure
by removing the two screws on the bottom, and remove the circuit board from inside the enclo-
sure. On one side of the circuit board there will be two battery holders. To remove the batteries,
simply slide them out of their holder. Slide the new batteries in with the negative towards the cir-
cuit board. Feed the antenna back through the hole in the enclosure, insert the circuit board, re-
place the bottom enclosure cover and insert the screws (be careful not to over tighten screws).
Setting the Communication Address
The RF-LPS will only respond to valid transmissions matching its configured address. The trans-
mitter and RF-LPS are preconfigured and may not need changing. To set the address, open the
enclosure by removing the two screws on the bottom. On the circuit board there is a row of
switches which may be set to any combination for a desired address. Please note that the ad-
dress set on the RF-LPS must match the address on the hand held RF remote controls (2CH-
REML or TX12E-2C). See TX12E-2C later for additional configuration details. It is advisable to
NOT set address switches to ALL ON or ALL OFF.
A device powered through the RF-LPS without the use of a
relay
A device powered through the RF-LPS using a relay to control
more current
ABACOM Technologies, Inc. •383 Bering Ave • Etobicoke • ON • M8Z 3B1 • Tel [phone] • Fax [phone]
www.abacom-tech.com
Batteries
Address Switches
Switched Supply Out
Supply In

ABACOM Technologies, Inc. •383 Bering Ave • Etobicoke • ON • M8Z 3B1 • Tel [phone] • Fax [phone]
www.abacom-tech.com
Absolute Limits and Operating Parameters
Input/Output DC Connector 2.1mm Center Positive
Breakdown Voltage 5V to 35V
Max. Current Throughput 200mA
Receiver Frequency 433.92MHz
Receiver Sensitivity -94dBm
Receiver Front-end Filter 600KHz
Modulation AM
Receiver Architecture Super Regenerative
Replacement Batteries 3V Lithium Ion 2450 series
Number of selectable addresses 255
RF-LPS Specifications
RF-LPS when used with TX12E-2C Keyfob Transmitter
This section applies only to the RF-LPS and TX12E-2C transmitter.
The TX12E-2C has two sets of DIP switches internally:
•One 10 position DIP switch and
•One 4 position DIP switch
10 Position DIP switch
Switches 1-8 are for configuring the system address. These settings may be any combination provided
they are the same settings for both the transmitter and the receiver.
Switch position 9 must always be set to OFF. (default position). This is important for correct operation.
Switch 10 position will affect the output state of D3 pin header on the RF-LPS.
DIP switch 10 in the OFF position (default position) will always result in a HIGH state on pin D3 regard-
less of which button is keyed on the transmitter. Conversely, with DIP switch 10 in the ON position will
always result in a LOW state on pin D3 regardless of which button is keyed on the transmitter.
4 Position DIP switch
DIP switch 2 must ALWAYS be set to ON (set to ON by default. Do not change)
DIP switch 4 must ALWAYS be set to OFF (set to OFF by default. Do not change)
DIP switches 1 and 3 may be set to the combinations according to the truth table on the next page:
Button 1
Button 2
4 position DIP switch
10 position DIP switch

Disclaimer:
Technical specifications are subject to change without notice. Whilst every effort has been made to ensure the accuracy of the information contained
in this document, ABACOM Technologies Inc. does not assume responsibility for any errors or omissions that may exist. ABACOM Technologies Inc.
does not assume responsibility for any damage caused through use or misuse of their products and the onus lies entirely with the end user in deter-
mining the suitability of, and use of, the product for any particular application. ABACOM Technologies Inc. products are not recommended for appli-
cations where human life may be at risk.
ABACOM Technologies, Inc. •383 Bering Ave • Etobicoke • ON • M8Z 3B1 • Tel [phone] • Fax [phone]
www.abacom-tech.com
DIP #1 DIP #3 TX BUTTON 1 TX BUTTON 2 VT D1 D2 D3 RF-LPS O/P
ON ON ON OFF 1 0 0 1 or 0 OFF
OFF ON 1 1 0 1 or 0 ON
ON OFF ON OFF 1 0 0 1 or 0 OFF
OFF ON 1 1 1 1 or 0 ON
OFF
(default)
ON
(default)
ON OFF 1 0 1 1 or 0 OFF
OFF ON 1 1 0 1 or 0 ON
OFF OFF ON OFF 1 0 1 1 or 0 OFF
OFF ON 1 1 1 1 or 0 ON
From the above table, the following can be noted:
•VT always goes high upon a button press, and may be used to indicate a valid transmission. VT
remains HIGH for the duration of the button press and then goes LOW
•Each button press latches the states of D1, D2 and D3
•D1 toggles state from Button 1 press to Button 2 press
•D3 is always HIGH if DIP switch 10 is in the OFF position
•D3 is always LOW if DIP switch 10 is in the ON position
•D2 toggles state between button 1 press and button 2 press when DIP switches 1 and 3 are not
both set to ON or OFF
The RF-LPS pin header for VT, D1,D2 and D3 may be used to connect to external devices for custom
applications.
RF-LPS Pin Header Truth Table