Products
VSD-E
Depending
on the firmware installed in the unit the
VSD-E provides various functions grouped into the VSD-EM (Monitoring
Only) or VSD-EG (GPS Capable) units including:
-
Four
inputs, 2 trigger H -> L and 2 trigger L -> H - individual
alert messages sent relative to the input sensed
-
Two
Outputs to drive relays or as input to other equipment (Open
collector to 0v)
-
Control
messages to turn relays on or of or pulse for one second on then off
-
GPS
coordinates returned by way of SMS if optional GPS mouse attached
-
Basic
Geofence monitoring if optional GPS mouse attached
-
Echo
state on two inputs, ie the state of each input can be read instead
of it generating an alert
-
Phone
paging for an alert condition instead of a Text message being sent
-
Group
sends using the SIM phone book entries based on the input sensed
-
12
- 18VDC 500ma power supply requirement
-
Input
levels can range from 0vdc to +18vdc with <+1vdc being 1
"Low" and >+3vdc being considered a "High"
state
-
Shortened
input sense time to accommodate using PIRs as input devices using a
text command as opposed to a hardware jumper
-
Shortened
input reset time from ~15 minutes to ~2 minutes using a text command
-
Ability
to enable relay activation when an input triggered
-
Command
to return the PrePay account balance of the SIM
-
Pin
code can be enabled on all commands
-
Dynamic
input polarity setting to combination that suits user
application
-
Ability
to delete all alert messages using a text command
-
Connection diagram
of the unit can be viewed here
Installation
of the VSD involves locating the unit in a vehicle (or whatever) and
connecting a suitable power supply (car battery, power pack etc). The
four x
sense inputs are then connected (if required) to appropriate switches,
sensors or
alarm outputs etc and the SIM card prepared for use. A
bi-colour green/red LED is provided to indicate how the VSD is
communicating with the GSM module. A green heart beat
indicates an idle "all systems ok" condition whereas various
state codes may be flashed out on the red LED depending on the GSM activity
in progress or for error conditions.
GPS
The
VSD-E unit is configured to enable connection of the PGM-648 GPS
Mouse receiver that communicates using a NMEA GPS interface. This
provides the method by which the Latitude and Longitude of the interface and the UTC time of the latest
reading can be retrieved. This has obvious
applications for GPS tracking or cars/boats etc.
In addition
a basic Geofence function provides the mechanism for an alert message
to be sent if the unit being monitored has moved outside of a
predetermined fence
perimeter (assuming GPS mouse connected).
Coordinates
returned by the GPS unit are in Degrees decimal-minutes (Dm) format.
It is important when using the coordinates to ensure the correct
format and datum (1984) is used relative to the mapping medium available.
Conversion to other formats is possible, one common format being
Degrees Minutes decimal-seconds (DMs).
Both
Dm and DMs coordinates can be used direct on 1984 Datum maps and charts
or as input to mapping software such as Tumonz or the “go to a point” tool of the www.wherearewe.co.nz
web site or perhaps even with Google Earth.
Out
of interest if the medium you are using requires DMs input and you wish to
convert Dm format coordinates (as received to your phone) to DMs proceed as
per the following example:
Dm Latitude –3650.7177 S
(from GPS)
Dm Longitude 17445.7055 E
Lat
Lon
Separate
Degrees
–36
174
Separate
minutes
50
45
Work
out decimal-seconds by multiplying everything to the right of the
decimal point by 60, ie for Latitude .7177 * 60 = 43.062 and for
longitude .7055 * 60 = 42.33. This
results in a DMs Latitude of –36 50 43.062 S and DMs
Longitude of 174 45 42.33 E.
As
we are the developers of the VSD we can also provide custom versions of
micro-controller code running on the unit should you have a requirement
for some additional functionality.
