Linear DXS-80, Manual

Page: 14 / 43

SECTION 3
LINEAR LLC
FCC ID: EF4 SST00116
4.0 RF TRANSMITTER CHARACTERISTICS
4.1 TRANSMISSION TYPES
Alarm, Status, Low Battery, Test.
4.2 ALARM
TRANSMISSION
An alarm transmission is sent 20 seconds after the CO detector piezo begins to
signal an alarm and the detector’s alarm output line goes high. During the alarm
event the transmitter will resend a transmission every 20 seconds. This continues
as long as the detector is in the alarm state.
An Alarm Restore transmission is not sent after the detectors alarm line returns
to low. The user will have to clear the alarm manually at the receiver or console.
4.3
LOW BATTERY TRANSMISSION
The battery status is sent with Alarm and Status transmissions. Test
transmissions are disabled when the battery is low. In a low battery condition the
test switch serves to silence the low battery chirp for 12 hours.
4.4 STATUS
TRANSMISSION
A status transmission is sent approximately every 1.1 hours
4.5
TEST TRANSMISSION (LEARNING TRANSMITTER INTO A RECEIVER)
1) Place the receiver into the learn mode (See receiver instruction manual for
learning mode details).
2) Press the test button in the smoke detector and release it after the alarm
beeps. A test signal (Alarm bit not set) will be transmitted a few seconds after the
button is released. To test an alarm signal (Alarm bit set) hold the test button and
an alarm transmission will be sent in 20 seconds.
4.6
RF TRANSMITTER SPECIFICATIONS
PCB Assembly Size: 2.74” X .83” X .75” approximately (including
height of antenna). Interfaces with smoke detector
via a four pin connector.
Frequency:
315 MHz
±
125 kHz
Encoding Format: DX Supervised
System Range: 350 feet, open air, typical.
Operating Voltage: 3 Volts. Detector supplies power to transmitter PCB
Status Supervision: A status signal is transmitted every 1.1 hours ±10%
Transmitter Timing: Alarm transmission is sent 20 seconds after receiving
a continuous alarm signal from the detector and at 20
second intervals as long as the detector is in alarm.
Note: The reset function does not stop these transmissions.
Temperature Range: -20
°
C to 60
°
C