HyQuest Solutions iRIS 150FX - Scan Mode; Scan Rate; Continuous Mode; Event Mode; Timed Mode

To Next Page

To Previous Page

Operation

4.4 Scan Mode / Scan Rate

To optimise the battery consumption when operating from the internal battery, the iRIS has a configurable “scan” option

that is changed via Power Settings in the General Config Menu. See Section Power . The scan option has four modes:

This chapter contains the following subsections:

Continuous Mode

Event Mode

Timed Mode

Telemetered Mode

4.4.1 Continuous Mode

In this mode, the iRIS will process its program continuously. This mode must be used if the logger is attached to

instruments that require rapid and continuous measurements such as wind monitoring or special serial devices.

4.4.2 Event Mode

In this mode, the iRIS will process its internal program only on an event, either a digital input activation and/or when a

timed event log is due to be stored. This is the lowest power mode and is intended for applications where the logger is

powered from only its internal battery (D-size battery variant). Typical installations are rain gauges and pulse type flow

meters. Pulses on the digital input(s) are captured and processed on an event basis. If a sensor is set to timed event mode,

pulses are accumulated and stored at the predetermined time - otherwise they are logged immediately.

4.4.3 Timed Mode

In this mode, the iRIS will only scan its program once at the programmed rate. This is a lower power mode than

continuous and will typically be used for low power analogue measurements. A typical installation is a river level site.

Pulses on the digital input(s) are captured and processed on an event basis. If a sensor is set to timed event mode, the

pulses are accumulated and stored at the predetermined time.

Note: The log rate for each enabled sensor must be the same as, or an exact multiple of the scan rate. For example, if the

iRIS has two analogue sensors attached, one configured to log every 5 minutes and the other every 15 minutes; the scan

rate should be set to 1 or 5 minutes. If however, the scan rate was incorrectly set, say to 15 minutes, two out of every

three logs of the five-minute sensor would be missed. If it was set, say to 2 minutes, logging would only occur at multiples

of two minutes, so both sensors would fail to log certain samples, with times such as xx:05, xx:15, xx:25 and so on missed.

4.4.4 Telemetered Mode

This mode is identical to continuous mode, except that the RS232 port is maintained in a permanently on state. Even

though the logger mode may be set to “Telemetered”, whether or not it is actually “active” is dependent on certain criteria.

Telemetry mode is active when no user is logged in and there has not been a key pressed or terminal action for at least 10

minutes (600 seconds). I.e. The device assumes that no one is still on site. It is also active when a user is logged in as this

enables a communication call-back test to be initiated. It is inactive when a key has been pressed and terminal activity is

occurring. To enable terminal use, the user will need to log out. See Section Log In/Out .

4.5 Analog Input Scaling

This section explains the recommended procedure to use when scaling an analog input (voltage or current). It makes use

of the scaling calculator provided in the iLink 2012 program. However, the calculation can also be done manually using

this formula. V = Input V, EU = Engineering Units (scaled output e.g. metres).

Multiplier = (Maximum EU - Minimum EU) ÷ (Maximum V - Minimum V)

Offset = Maximum EU - (Multiplier × Maximum V)