Monarch Instrument Track-It - Manual (Page 22)

Track-It User Guide
Page 22 Rev 1.02 06/21/11
4. Special Input Types
4.1. Event Logger
The event logger is used to measure the state of the inputs (2), whether they are High or Low. External modules must be used to
interface to the logger. The logger has a user settable internal bias voltage which applies a weak pull up to the inputs (high
state) which is the normal idle state in this case. The external modules then pull the inputs low when there is an event. Note that
isolated modules add an inversion state - when active (energized) the modules pull the logger inputs low. The event Logger also
has the ability to measure temperature using the internal sensor.
Note: There are two modes of sampling and storing data depending on the setup of Channel 1.
Sampled Mode: If Channel 1 is selected to measure temperature, the Logger will take readings at the
sample rate set by the
user. This sample rate will also apply to the event/state input of Channel 2. Thus the state of the input of Channel 2 will be
measure only when the temperature on Channel 1 is measured.
Event Mode: If Channel 1 is selected to be External State/Event the Logger will only save a sample if the state of the input
changes - High to Low or Low to High. This is independent of the Sample Rate which will be disabled. This will now also apply to
Channel 2 - a sample will only be taken on a change of state. A change of state on either input will cause a sample to be saved.
In Event Mode the user will be unable to change the sample rate and the resolution of the event timestamp will be 2 seconds.
(Events less than 2 seconds may not be seen.)
The mode of Channel 2 is indicated by the addition of the word (Sampled) in the software setup window - determined by how
Channel 1 is set up.
The software recognizes the Logger type and presents choices accordingly.
The Input setup window for Channel 1 is shown right.
The user has the option to select Channel 1 as
Internal Temperature or External Event/State. (Note:
Channel 1 cannot be disabled)
If Channel 1 is set for External Event/State there are
several parameters that can be configured.
Device LCD Display - is a short message that is
displayed on the Logger Display (and on the Graph)
when the inputs are High or Low. Use the pull down
menu to select a message that works for you.
Channel Tag and Eng (Engineering) Units can be
used to add description to the input.
Invert Input - if this box is checked the sense of the
input will be reversed, on the LCD Display and on the
Graph (An Actual High on the input will be considered
a Low in the sampled data).
Bias Voltage - Check this box to provide a weak pull up to the inputs. This enables the external modules to function. If you have
the ability to drive the inputs directly this box can be unchecked to save battery power. Note that the maximum input to the Event
Logger is 3Vdc.
Channel 2 is set the same way as Channel 1 Event/State. If Channel 1 is set as Temperature, the device will be in Sample Mode
and Channel 2 setup will indicate - External Event/State (Sampled). If Channel 1 is set to the External Event/State the device
will be in Event Mode and Channel 2 setup will indicate External Event/State.