DATAHOG 2 & SKYELYNX STANDARD SOFTWARE
Instructions to reconfigure a tensiometer relay channel
SKYE INSTRUMENTS LTD
21, Ddole Enterprise Park, Llandrindod Wells, Powys, LD1 6DF, UK
Tel: +44(0)1597 824811 Fax: +44(0)1597 824812
Email:
[email protected] Web: www.skyeinstruments.com
Updated 08/10/07
TO CONFIGURE:
*ANY NUMERIC KEY TO PROCEED (0-9)*
FORMAT TO ENTER RELAY THRESHOLD
1.
Connect the DataHog 2 datalead to the RS232 port on the logger, and to the appropriate serial
communications port on your PC.
2.
Start the SkyeLynx Standard software as usual. If the logger is in 'log mode' you should hear the
logger 'beep' every 10 seconds and simultaneously display the following message in the main
blue window on screen
3.
Click on the FILE menu and choose Wake up Logger. When the screen has finished scrolling you
will see the logger Main Menu displayed. (Please remember that whilst the logger is 'awake' and
in Main Menu mode, it is not recording any measurements or switching the relays.)
4.
To reconfigure a relay channel, choose Option C from the Main Menu (by pressing 'C'). Please
check your Hardware Configuration Certificate at the front of your DataHog 2 manual before you
begin. This will show all the information you will be asked to enter.
Enter the Relay number you wish to configure, e.g. 1
Enter the Software Channel Number of the channel you wish to associate with this relay, e.g. 00.
Enter the relay threshold in the format requested - see below for calculation examples
The choices you have just entered will be displayed for your confirmation, however the threshold
is now expressed in the units of measurement (e.g. hPa etc). Press 'Y' to confirm and return to the
Main Menu.
5.
It is advisable to check that the changes you have just made are in place before returning the
DataHog 2 to logging mode.
From the Main Menu, choose Option 1 to display the current setup.
Choose '4' from the sub-menu to check the relay setup. The relay number will be shown with its
associated software channel and its threshold setting.
Choose '6' to return to Main Menu
6.
Press ESCAPE to return the DataHog 2 to logging mode. Wait for the message 'ANY NUMERIC
KEY TO WAKE UP' to appear before disconnecting the datalead and PC.
Tensiometer channels are a differential voltage type, configured by the Ax+B scaling and so the
threshold must be entered as a count value with a +/- sign.
A)
The logger's Full Scale count value is +19000.
B)
The tensiometer's Full Scale hPa value will be shown on the logger's hardware
Configuration Certificate
C)
So the "number of counts per hPa" is +19000 / (tensiometer Full Scale)
(e.g. 5468.2 for the sensor SKT 650 26123)
(e.g. +19000 / 5468.2 = +3.47 counts/hPa for tensiometer SKT 650 26123)
(Continued)
