Fig 6. Sensor connection to ADA-401WP module with (2-wire) 1-WIRE network
3.4.2. SUPPORTED SENSORS WITH 1-WIRE INTERFACE
To ADA-401WP module can be connected devices like :
–
based on circuits: DS1820, DS18S20, DS18B20, DS1822, DS2438Z, DS2401,
–
temperature sensors DTS-103 & DTS107,
–
environmental parameter sensor DES-200 (temperature, relative humidity, atmospheric pressure),
–
environmental parameter sensor DES-216 (temperature, relative humidity, atmospheric pressure, lighting),
–
environmental parameter sensor DES-300 (temperature, relative humidity, atmospheric pressure, lighting, sunlight, CO2
concentration),
–
PT100 sensor to 1-WIRE converter DES-216-PT100,
–
PT500 sensor to 1-WIRE converter DES-216-PT500,
–
PT1000 sensor to 1-WIRE converter DES-216-PT1000,
–
Analog signal 0-10V DC to 1-WIRE converter DES-216-U,
–
Analog signal 0-20mA DC to 1-WIRE converter DES-216-I,
Method of connection above sensors to ADA-401WP is shown in user manuals of above devices.
3.4.3. SUPPORTED CIRCUITS WITH 1-WIRE INTERFACE
ADA-401WP module supports 1-WIRE interface circuits like: DS1820, DS18S20, DS18B20, DS1822, DS2438Z, DS2401.
In preparation DS2401 circuit.
3.4.4. 1-WIRE NETWORK LIMITATION
The maximum length of 1-WIRE network as layouts producer can be even 400m and the maximum number of sensors can be 500.
However, when building the network, remember that, each sensor is a shortening of 0,5 meters and 100 meters of cable causes
additional capacity load data line 5nF increasing signal distortion.
The real 1-WIRE network length and number of sensors will be less and will depend on:
–
type of cables,
–
topology connections,
–
quality connections,
–
interference from external electromagnetic fields.
RECOMMENDATIONS :
–
using one type of the cable, we recommend computer twisted cables UTP 4x2x0,5, for 1-WIRE bus,
–
1-WIRE network connection in linear topology or use the passive 1-WIRE network splitter DNB-400,
–
ending the 1-WIRE network by sensor,
–
connecting unused wires and screen cable to PE rail of electrical installation.
–
powering ADA-401WP module from individual power supply.
3.5. POWER SUPPLY CONNECTION
The power supply to ADA-401WP module should be DC (regulated) from 10 V to 30V and minimum nominal power should be 3W,
e.g. ZS-12/250 or DR-15-12. Power cable from DC power supplies to device must not be longer than 3m.
Observe the polarity, connect positive (+) of DC power supplies to V+ and negative (-) end to V- terminal. ADA-401WP has the
protection from opposite connection power supply. If after power, on the front panel is not lit green LED PWR, check the power
connection (polarity).
8
ADA-401WP
ADA-401WP
VDD
GND
1-W
Rx+
Tx+/ A
Tx-/ B
GND
Rx-
Vss-
Vss+
V+
10–30VDC
3W
V-
1-WIRE (2W) Bus
1-WIRE
Connector
RS485/RS422
Connector
Power Supply
DS18B20 Sensor
DS18B20 Sensor
DS18B20 Sensor
