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EZ-View
7.2
Relay Card Settings
The optional relay card can be used to provide a local alarm output at the computer that can be used for
audible and/or visual indication of an alarm to alert operators in the vicinity. It can also be configured to use a
relay output to operate an auto dialer.
The Main Alarm Contact selections allow the user to choose which relay (K0 – K7) will be used for the alarm
contact. When a check is placed in the enable/disable checkbox to enable the relay contact, and an alarm
occurs, the relay will be energized and its contacts will close. The relay will stay energized until an operator
silences the alarm by pressing the “Silence Beeper” button on the System Alarm Log screen.
The Auto Dialer Alarm Contact selections allow the user to choose which relay (K0 – K7) will be used for
the auto dialer control contact. When a check is placed in the enable/disable checkbox to enable the relay
contact, and an alarm occurs, the relay will be energized and its contacts will close. The relay will stay
energized for the time period entered in the “Reset Auto Dialer Contact After…Seconds” field. The time
period is dependant upon the auto dialer used, and must be set to the proper length of time in order to allow
the auto dialer to complete the call.
Once the relay is energized on the first alarm, if other alarms occur during the “on” time period, they will be
ignored, and the auto dialer will complete its call(s) based on the first alarm. Once the timeout period expires
and the relay turns off, the system will be ready to initiate the auto dialer again on the next alarm.
NOTE:
7.2.1
Use of System Standby: If the Windows operating system puts the computer into “Suspend” mode,
all USB hubs are issued a reset when the suspend mode is executed. This will cause the relay card
to lose power briefly, resulting in all relays being reset even if an alarm is present. Since the
computer running EZ-View is a supervisory control and data acquisition system, it is recommended
that power options for the computer under the Windows control panel, be set to “always on” and
ensure “system standby” is set to never.
Relay Card Installation
The Ontrak ADU208 relay card is a USB interface device and can be plugged in to any available USB port on
the computer. Power for the operation of the card is provided through the USB connection. There are 8 type
“A” relay contact outputs in the ADU208 rated at 5A@120VAC or 5A@30VDC.
The ADU208 also provides connections for 8 digital inputs; however, they do not provide any functionality in
EZ-View. The figure below show the proper connection of DC and AC loads.
SETUP OPTIONS
EZ-View
7.3