M1XRFTWM Installation Manual
Page 7
Operation
How does the Elk Two-Way technology differ from one-way wireless technology?
Elk's Two-Way technology is superior to traditional one-way wireless products in many ways.
1. Every signal sent by an Elk two-way sensor receives a positive acknowledgment from the transceiver.
One-way systems have
the reputation of being "fire and pray"
.
2.
Elk two-way sensors only send one signal at a time.
One-way sensors have no choice but to blindly send multiple signals in
hopes that at least one will reach the receiver.
3. Long battery life and energy efficiency are inherent designs of the Elk two-way sensors. Elk two-way sensors only need to re
-
transmit if they get not response from the transceiver.
4. Long range coverage is possible due to the 900 MHz frequency range and automatic frequency hopping design.
One-way sys-
tems operate at a specific, non-adjustable lower frequency.
5. A two-color LED indicator on the sensor provides operational feedback. A single Green blink means the transmission was sent
and positively acknowledged by the transceiver. A Red blink means the sensor was unable to receive an acknowledgment from
the M1XRFTWM transceiver.
One-way sensors provide no indication of signal verification.
6. Installation confidence. All Elk 6000 series sensors artificially limit their RF power to 50% of normal for the first 10 minutes after
battery installation. This "stress test" helps to assure that a sensor's mounting location and range is suitable for long term reli-
ability. The principle is that a sensor that is able to reliably communicate using half the normal power will have a high degree of
reliability with full 100% power.
Other sensor brands do not provide this confidence feature.
To take full advantage of this feature
we recommended that every sensor be temporarily installed at its intended location and violated (tripped) multiple times while
observing the two-color LED indicator. A near instant GREEN blink response from the sensor is Ideal. The sensor will repeatedly
attempt to reach the receiver for up to 20 seconds, but any time it takes more than just a few seconds to get through it means that
the mounting location is poor. Therefore, we strongly suggest reorienting the sensor to another spot on the mounting surface,
or rotating its mounting by 90 degrees whenever it takes more than a few seconds to get a GREEN acknowledge. Excessive
range and poor wireless conditions will always result in a delay of the GREEN blink. A Red blink means the sensor was unable
to receive an acknowledgment from the M1XRFTW transceiver. NOTE: In extreme situations it may be necessary to relocate
the transceiver to a closer spot or to add an additional remote transceiver to cover distant sensors.
NOTE: The Green Acknowledge LED does not operate for sensor restoral transmissions.
Programming tools needed for the M1XRFTWM Transceiver and Sensors.
There are no special tools required for Elk's two-way wireless product line. The Transceiver itself and the sensors may be programmed
using either the M1 Keypad Installer Programming or the ElkRP Remote Programming software. The following pages document the
options and steps for programming from the keypad.
Installation and Replacement of Batteries in Wireless Sensors:
:
A Low Battery trouble will be sent to the Control whenever a sensor determines that its battery needs to be replaced. This will
generally occur well in advance of the battery becoming completely dead. However, it is up to the customer to ensure that the Low
Battery trouble is responded to and rectified in a timely manner so that the system can continue to operate.
When replacing a Low Battery:
1. Remove the old battery and
WAIT AT LEAST 20 SECONDS
before installing the new battery. This is important as it allows
the sensor circuitry to completely shutdown and erase the low battery memory.
2. After
20 seconds
, install the new battery, then trip the sensor a couple of times so that an "all good" signal will be sent to the
control to clear the low battery trouble.
