Xylem SDI-12 Data Logger iRIS 220, iRIS 320, iRIS 350, iRIS 150, iRIS 300 - Manual (Page 10)

iRIS Datalogger User Guide V1.50
4 iQuest (NZ) Ltd - PO Box 15169, Hamilton, New Zealand Tel: +64 7 857-0810 Fax: +64 7 857-0811 Email: [email protected]
2.3.4 Power Management
The iRIS supports four power management modes which are described below. Power management features
that operate in all modes include:
 Deactivation of RS232 driver i.c when the DSR signal is not present (unless the unit is active in
RS232 telemetry mode).
 Turning off the backlight after a period of inactivity when no user is logged-in.
 Ability to activate an IP session at scheduled times of day for pre-set period even if the modem is
otherwise disabled in full power save mode.
No Power Save
With power management disabled, the internal wireless modem is maintained in a powered on state even if
an IP or CSD session is not currently active. While in this state, periodic signal strength measurements are
made and it is possible to interrogate the internal modem using the AT command set via a terminal
connected to the serial interface. All on-board communication, I/O and all status LED’s are permanently
enabled in this mode.
Partial Power Save
With the power management mode set to Partial Save, the on-board LEDs are disabled but the internal
wireless modem remains in the same fully active state as in the No Power Save mode.
Full Power Save
When power management is set to full save mode, the internal LEDs are disabled and the internal wireless
modem remains in a powered off state until a wireless session is activated.
While the modem is in this state, it is not possible to obtain signal strength measurements
or interrogate the modem via the AT command set using the Modem Terminal mode.
RS232 Only
This mode is provided for applications where the internal modem is not used and telemetry is achieved by
a data radio or modem connected to the RS232 port. When in this mode the RS232 port is used for all call-
back communication. The RS232 port behaviour also changes depending on whether the iRIS is in
“Normal” or “Telemetry” mode. See RS232 Interface Telemetry for further details on RS232 telemetry
communications.
2.3.5 Data Logging
The iRIS supports the logging of data from six virtual sensors, plus a further three internal data sources
(battery voltage, supply voltage and logger temperature). Each of the six main virtual sensors can obtain
information from one of the following data sources:
 Analog Input on AIN1 – AIN4
 Pulse Counter attached to DI1 or DI2
 Simulated Pulse Counter enabled by DI1 or DI2
 Frequency Counter attached to DI1 or DI2
 Up/down Counter attached to DI1 and DI2 simultaneously
 Received Signal Strength Indication (RSSI)
 Internal Database Location (for values obtained via user script or communications link)
 High-speed Serial Instrument (Unidata format – 2 byte only)
 SDI-12 serial channel
 Quadrature shaft encoder
 Change of status on charger input (dc supply)