Xylem SDI-12 Data Logger iRIS 220, iRIS 320, iRIS 350, iRIS 150, iRIS 300 - Manual (Page 65)

59 iQuest (NZ) Ltd - PO Box 15169, Hamilton, New Zealand Tel: +64 7 857-0810 Fax: +64 7 857-0811 Email: [email protected]
6.10 Connecting a Vaisala WXT5x0 Weather Transmitter
The Vaisala WXT5x0 Weather Transmitter is a compact, well-featured instrument that is ideal for
implementing small weather stations. The iRIS supports the connection of these units using the SDI-12
interface.
Although the standard iRIS software only supports six sensors, it allows a special exception
when using the WXT5x0, which provides seven parameters. To achieve this, hail
measurements are logged as a “secondary” sensor linked to rainfall, (which must be
configured as sensor 6). Hail is logged with an array ID of 10 and it shares the same logging
configuration as rainfall (logging rate, event mode etc). The hail “sensor” is not visible from
the LCD or terminal sessions.
The instrument should be connected as shown below. The SDI-12 interface adaptor is omitted for clarity.
This diagram assumes the use of the optional interface cable that is provided by Vaisala. Cover the screen
wire (clear) and unused wire ends (pink, yellow and grey) heater with sleeving or heatshrink tubing to avoid
short circuits.
TOP iRIS I/O Connector
BOTTOM
6.10.1 Configuration
Use the Vaisala WXT Configuration Tool to set up the WXT5x0 to provide the correct composite message
and processing settings. Then configure the iRIS sensor settings to suit the instrument.
The screen shots on the next page (Section 6.10.2) show the settings that are recommended for this
application.
The last subsection, (Section 6.10.3) shows the settings for each of the sensors to enable the WXT5x0 data
to be acquired and logged.
AI4
AI3
AI2
AI1
AGND
AOUT
DIO4
DIO3
DIO2
DIO1
SDI-12
DGND
12V+
GND (-)
VIN+
GND (-)
Data Out (TxD)
Data In (RxD) WXT5x0
Vin+ Weather
Data Gnd Instrument
Vin Gnd
Green
Brown
Blue
White
Screen (Clear)