Initial User Setup; Data Logging; Real Time Clock (Rtc); Figure 3-2: Model 923-Edl Typical Setup Connection Using A Pc And Focal Gui - Focal 923 User Manual

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Model 923 Data Logger – User Manual

3.1.2 Initial User Setup

The only initial user setup requirement to start logging sensor data is to power up the 923-EDL card with

+24 VDC (nominal). In order to access real-time sensor data the user can connect to the card via the RS-485

port using the sample Focal

GUI as shown in the figure below or a 3

party Modbus RTU software

configured as a master.

The 923-EDL uses a proprietary logging algorithm that enables the card to compute the maximum, minimum

and average measurement of all the sensor parameters within the specified log interval. This allows the user to

select longer log intervals without losing sight of critical events within the specified log interval. The data logging

interval can be set between 1 to 120 minutes and it can be changed by the user by using Focal's GUI software

through the data port J5.

The data obtained from the sensors is stored in the card's on-board 32 MB flash memory. This memory size

allows up to 14 years' worth data to be stored when the log interval is set to 60 minutes.

The 923-EDL has an on-board a real time clock (RTC) with an accuracy of ±5 ppm. An on-board, 3.3V

rechargeable lithium-ion battery (B1) maintains the correct time even when the card is not powered for a period

of up to four months. This real time clock is used as the time stamp when logging the sensor data into on-board

flash memory. The time stamp will be reset to factory default if the battery has been drained – any data logged

to the flash memory with a dead battery will be accurate, but the time stamp will start at 01/01/2000 00:00:00

(dd/mm/yyyy hh:mm:ss).

The on-board battery is recharged while the board is powered on. Note that the battery is intended solely to

keep the RTC running, not to operate the entire data logger. Normally the RTC is operation even when there is

no power applied to the card.

Note: The RTC is normally synchronized with a PC's clock. The factory clock used to synchronize the RTC has

a time zone of UTC-04:00 (Atlantic Time Canada) and when connecting to the card using the sample GUI, the

user will be prompted with the option to re-sync the RTC with the local PC or keep the factory default values. It

is recommended to re-synchronize the RTC at the time of final system installation.

Focal Technologies Corporation

Page 3-3

A Moog Inc. Company

Document No: 923-0603-01, Rev. 2

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