User`s manual

Alcorn McBride Digital Video Machine DVM-7400 User’s Manual Rev 1.5

Main Spreadsheet

The program uses a spreadsheet layout with horizontal rows that represent specific tasks for

the DVM to execute, and vertical columns that contain the various parameters associated with

the particular task. Clicking the small buttons to the right of each cell will provide further help

with that cell’s contents. The following explains each column in detail.

Command

The Command column contains the command to be executed at a particular Longitude and

Latitude (if specified). A pull-down menu of available commands is provided. Often, this

command is a Play command because you normally want to play a particular video at a

specified location. Other commands such a Set Relay ON/OFF are available as well.

Data Columns

The Data columns are used to supply additional data for commands that require it. For

example, a Play command would require data to specify which file to play.

Latitude and Longitude

The Latitude and Longitude fields specify the coordinates the command will be executed.

These fields can be entered manually, or they can be inserted automatically using the Capture

feature of GPS Builder.

Tolerance

Longitude and Latitude data provided by the GPS sensor is updated at one-second intervals

(this is a function of all GPS sensors). As a result, it is extremely unlikely that the exact

coordinates entered in the Latitude and Longitude fields will be encountered.

The Tolerance field is used to define the size of a circular GPS ‘Zone’ around the specified

coordinates. The size of this zone can vary greatly depending on the speed at which the

vehicle is traveling as well as how far the vehicle can possibly stray from the center of the zone

(ie. a vehicle traveling on multi-lane highway may not always be in the same lane). Clicking on

the button located in this field will reveal a helpful utility for setting the Tolerance based on the

size of the zone or speed of travel.

Tolerance can be changed at any time in the playlist. For example, you might want to tighten

tolerance for a trigger that occurs while the vehicle is moving slower (or stopped), and need to

open it up for when the vehicle is traveling faster. When setting the tolerance, just keep in

mind that GPS coordinates are only updated once per second. This update must happen at

least once inside the zone for the GPS trigger to occur.