User`s manual

Alcorn McBride Digital Video Machine HD User’s Manual Rev 1.0

Main Spreadsheet

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

tasks for the DVMHD 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.

Direction

The Direction column specifies the direction the vehicle must be traveling in order for

the trigger to occur. The DVMHD allows for 45 degrees of tolerance for this field, so

there’s no need to worry about the direction of the vehicle being absolutely perfect.

For example, if the heading field is 90 degrees, the DVMHD will accept any heading

between 67 degrees and 113 degrees as a valid condition for the trigger.

If you don’t require direction to be a factor in the GPS triggers, you can make the GPS

trigger Omni-directional by leaving the contents of this field blank.

This field can be filled manually, but is also inserted automatically when using the

capture feature of GPS Builder.

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 (i.e. a vehicle traveling on a 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.