 The D2Photo, light presence/absence monitor, provides the ability
to monitor the state of fluorescent or incandescent lighting
in a 1-Wire network. The D2Photo is so low power that 200 of them
can reside on the same 1-Wire network up to 2000 feet long when CAT-5 twisted pair
cable is used. The D2Photo will steal power from the network so that the user does
not need to provide power. The unique address provides absolute identification of
which light source is being monitored. The D2Photo supports conditional (Alarm)
search mode that allows very fast and efficient system wide status update.
The D2Photo has a built-in multidrop controller (DS2406) which provides a unique
64 bit registration number (8-bit family code + 48 bit serial number + 8 bit CRC)
assuring error-free selection and absolute identity; no two parts are alike. Unique
addressing allows I/O function to be identified absolutely.
The D2Photo is designed to operate in a network of EDS 1-Wire digital and analog
modules. Only two connections are required: common("C") and data signal("S").
The D2Photo does not need to be powered, all necessary operating power is stolen
from the 1-Wire bus.
The D2Photo can be connected in a 1-Wire network for continuous polling (with
ONESIX). The D2Photo requires a 1-Wire host interface or adapter such as the EDS
HA3, HA4, HA5, HA7S, HA3T, HA7T, T8DH, or Dallas Semiconductor DS9097U, DS9097E.
Features
- Monitors fluorescent and incandescent light status.
- Parasitic operation, no power supplies required.
- Small size allows direct application to light source.
- All data transfers are CRC16 error checked.
- Supports Alarm Search for fast operation.
- Light presence/absence is latched until read.
- Built-in multidrop controller, (DS2406).
- CAT-5 twisted pair up to 2000 Feet, 200 devices.
- 1-Wire communication protocol.
Specifications
- Network Supply Voltage: 2.8 - 5.5 Volts
- Supply Current (network load): 3 - 7 MicroAmp
- Photosensitivity Spectral Range: 730 - 1100 nm
- Photosensitivity: 0.2 MW/cm2
- Max. No of Parasitic Devices: 200 Devices
- Operating Temperature Range: -40 - 85 ºC
- Dimensions: Width= .835, Height= .200, Length= .610 Inches
1-Wire is a registered trademark of Dallas Semiconductor Corporation.
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