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iRIS 220 / iRIS 320, V1.19 User Guide
2 Overview
2.1 Introduction
The iRIS 220 and iRIS 320 (iQuest Remote Information Source) are two related products that share similar
electronic components and operate in much the same way. They have been designed as cost effective, low
power, self contained information sources for use in a wide range of data gathering and logging applications.
Both models achieve GPRS or CDMA network connectivity through the use of an integral wireless modem.
Depending on the application and target market, this modem will be one of the following:
• Dual-band 900MHz/1800MHz GSM/GPRS
• Single-band 1900MHz GSM/GPRS
• CDMA/CDMA-1X
This modem also supports the alternative GSM or CDMA connection options of CSD (Circuit Switched Data)
and SMS (Short Message Service). These options require the appropriate service to be enabled by the
wireless service provider.
The two units differ primarily in their available features and also the enclosure design. The following two
sections explain the key differences between the two models.
2.2 General Characteristics – iRIS 220
The iRIS 220 is supplied in a lightweight extruded aluminium enclosure finished in a resilient powder coating.
This enclosure provides mechanical strength and EMI shielding, and also enables easy mounting in a variety
of situations.
The iRIS 220 supports a maximum of six external sensors (1-6). Sources for these sensors may be chosen
from physical digital or analog inputs or virtual sources (via serial communication or internal calculations).
Each sensor has two associated alarms, each with separate trigger and reset levels. Each alarm also has a
duration, which is used to delay the alarm trigger for analog inputs and to determine the time over which
pulse input counters should be totalised (for rainfall etc).
Three additional sensors (7-9) are reserved for internal measurements (battery voltage, supply voltage and
logger temperature). Data from all enabled sensors are logged in a four word (8 byte) compressed format
which includes full date and time to fractions of a second.
Figure 1 - iRIS 220