5 Minute Read
| Overview
The Occupancy and Temperature Node is a product of the 75F system. It is tailor-made for BMS scenarios that demand micro zone level controls, that can override the existing schedules.
It provides efficiency in the BMS, where there is occupancy in space is dynamic like,
- A restaurant where occupancy varies during the day, and every other day.
- Work environments post Covid19 with cycled number of employees for the week. Predicting what part of the building gets occupied and what does not is a new requirement to handle.
| Features
- The Occupancy and Temperature Node is powered by a 2 x AA battery and hence no wiring is required.
- The device is capable of communicating on a 75F proprietary RF network and does not need a gateway to connect to the rest of the system.
- Minimal BOM, hence value for money, since each zone needs only one such device without any cabling, gateway device, etc.
- The device can sense temperature and humidity,
- Comes with mechanical buttons to operate.
- Can work as a thermostat if it controls nothing.
- The battery life is upto 2 years.
| Specifications
- Measurement range: Humidity 0 to 100% (+/- 2% RH), Temperature (typical +/- 1F). 0 to 122°F (-17 to 50°C).
- Operating range: Humidity 20-85% noncondensing. Temperature -5 to 255°F (-20 to 125°C)
- Occupancy Sensor based on Passive Infra-Red (PIR) with a detection range of 3m with a 110-degree conical angle.
- 915- 923 MHz IEEE 802.15.4-compliant transmitter for communication with CCU.
| Power
The OTN which is powered by a 2 x AA battery requires no wiring as such for power.
| Operations
OTN operates in two different modes under normal working conditions.
The default screen to access the different readings.
- Addressing mode - To set the pairing address of the OTN during pairing.
| Usage
By default, when powered ON Diagnostic mode displays.
To access the Addressing mode,
- Press and hold down both the RED and BLUE buttons on the OTN simultaneously.
In the address mode, the last stored address blinks until the user presses any of the buttons again, after 2-3 seconds.
Note: If the user short-presses the button within 2 seconds, then the address resets to 1000. Hence press the button after around 3 seconds, to start the pairing address from the last saved address.
From here, set the pairing address:
- Long Press (100ms minimum) the RED button to INCREMENT the address by one count to begin with.
- Long Press (100ms minimum) the BLUE button to DECREMENT the address by one count to begin with.
To increment the address by different counts:
- First 10 counts, incremented in steps of 1
- Next 10 counts, incremented in steps of 10
- Next 10 counts, incremented in steps of 100
- Last 10 counts, incremented in steps of 200
If at any point, the user releases the button, the address mode waits 10 seconds before it exits.
Note: This occurs to allow the user to change the address in case of a wrong entry.
- Match the pairing address in the device to the pairing address in the CCU. The address sets automatically after a certain delay and displays a message 'Set' indicating the pairing address saved successfully.
- Press the buttons longer for a smoother UI functionality.
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