Residential Use Detectors

SD728W Wireless Smoke/Heat Detector with Interconnection

1. The transceiver employs the hopping code technology. A microprocessor used in SD 728W acts as an interface between detector and transceiver for signal processing.
2. SD 728W can be set into a specific group for the interconnection of smoke detectors. The number of detectors in one group can reach up to 80 units. Each detector can be also set to become a repeater. The communication among different groups is permissible in such a way that the maximum number of detectors in one group becomes 79, therefore, the last ID code is used to designate as the group's ID.
3. SD 728W allows for 30-second delay time for radio interconnection to prevent false alarm.
4. The electronic circuit of learning mode for SD 728W allows registering the individual ID for each detector in one group.
5. The main console ES 280 for SD728W smoke detectors is an optional device, which is used to monitor special conditions such as alarm, low battery indication or tamper status supervision in the situation when there is the defaulted position of detector in the interconnected loop.
6. SD728W can send out the low-battery warning signal, which is a chirping sound every 32 seconds, for a duration up to 30 days.
7. Everday's remote controller ES 154L is an optional device to provide remote detector testing and alarm silencing functions.
8. A relay (optional) can be used for SD 728W detectors for NC (normal close) or NO (normal open) output function.

1. How to use the grouping function for detectors SD728W
   1. Press the REG switch (SW1) in the transceiver of the detector to be grouped so that the learning mode of the detector is activated to recognize the IDs of other detectors in the same group. The LED 2 on the transceiver¡¦s printed circuit board (PCB) will flash for sixty (60) seconds. To complete the learning mode, just press the REG switch once again. Repeat this procedure for all the detectors in the same group.
   2. Subsequently press TX switch (SW3) on transceiver of each detector to be grouped for the transmitter in the transceiver to emit its ID code, which will then be received by other transceivers of the neighboring detectors to store this ID in its electrically erasable programmable read-only memory (EEPROM). The LED2 in the neighboring detector will light for one second to indicate the ID signal is received. Repeat this procedure for all the detectors in the same group.
2. How to erase the previously set ID code in the detector SD728W
   1. Press the REG switch (SW1) of the transceiver to make LED2 on the transceiver flashing.
   2. Press ERA switch (SW2) of the transceiver until LED2 on the transceiver turns off. This means ID code has been erased.
3. How to set up the detector SD728W to be a repeater
   1. Set REP jump (JP1) to be open circuit in order to turn the detector to become a repeater. The repeater would play a role to repeat the alarm signal coming from the source detector in the longer distance in the group, which initially gives the alarm.
   2. The repeater function is disabled when the REP jump (JP1) is set to be close circuit
4. How to set up the replay output for detector SD728W
   1. The relay dry contact output NO (normal open) or NC (normal close) can be set at CN2 connector.

1. Modulation: Amplitude-shift keying (ASK) modulation
2. Working frequency: 868MHz or 433MHz, 25 kHz
3. Transmitter power rating: les than 10 mW.
4. Working current on transmission mode for 6 seconds: 10 mA (max)
5. Operating voltage: DC 4.5-5.5 V
6. Working current in receiving mode: 6 mA (max)
7. Stand-by current in the sleeping mode: 50 µA.
8. Receiver sensitivity: 115 dBm.
9. Receiver wake-up time: 100 ms
10. Broadcasting distance range: 80 meters in a free space or 25 meters indoors
11. Working temperature: -10OC to 60OC, 95% R.H. (max).
12. Dimensions: 100 mm (D) x 70 mm (H)
13. Weight: 385 grams
14. 14. Battery life: up to one year