oCompassDN Object

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Description
Operation
Properties

Examples
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Description:

A Hardware Object that reads a Dinsmore 1490 Compass and returns a URCP heading value.

The following table lists the size and availability of the oCompassDN Object.

	Object	Size	Description	A1	A2	B1	B2	C1
	oCompassDN	4 Bytes	Reads a Dinsmore 1490 Compass.			x	x	x

Operation:

The oCompassDN Object uses the 4 I/O lines specified by the IOPack to read a Dinsmore 1490 Compass module. It converts the data to a URCP heading value which is then stored in the Heading property.

When created, the oCompassDN Object also creates an instance of the oOrbitSwitch4 object which it uses to read the 4 I/O lines and generate the Heading value. Modifying any of the properties of the oOrbtSwitch4X Object instance will affect the oCompassDN Object's operation. See the oOrbitSwitch4 for more detail on how the 4 I/O lines are read.

Properties:

The following table lists the properties of the oCompassDN Object:

Property
Description

Heading

A value that indicates the compass heading.

Object Class: oHeading Value Range: -128 to +127

Data Type: Numeric Default Value: 0

Direction Heading

URCP Heading

N 0

NE 32

E 64

SE 96

S -128

SW -96

W -64

NW -32

IOPack

A value that specifies which pack of 4 I/O lines is connected to the Dinsmore 1490 Compasses 4 connections..

Object Class: oIOPack Value Range: 0 - 7

Data Type: Numeric Default Value: 0

Some I/O Lines have special purposes. Be sure to see oIOPack help file for details.

Operate

A value that selects whether or not the Dinsmore 1490 Compass is being read.

Object Class: oOperate Value Range: 0 - 1

Data Type: Numeric Default Value: 0

Operate Constant Description

0 cvOff The compass is not read.

1 cvOn The compass is read.

DIO

The I/O function object used to read the Dinsmore 1490 Compass.

Object Class: oOrbitSwitch4 Value Range: -128 to +127

Data Type: Numeric Default Value: 0

Address

Returns a pointer to the address of the oCounter Object instance.

Object Class: oAddress Value Range: 0 - 127

Data Type: Pointer (Read Only) Default Value: Address of Object

Examples:

In the following example, the oCompassDN Object

' This program reads a Dinsmore 
' Compass and displays the binary 
' URCP value on I/O Lines 8 - 15

Dim A As New oCompassDN 
Dim B As New oDio8

Sub Main()
  ooPIC.Pullup = 1
  B.IOGroup = 3
  B.Direction = cvOutput
  A.IOGroup = 1
  A.Nibble = 1
  A.Operate = cvTrue
  Do
    B.Value = A.Value
  Loop
end sub

Connections:

+5 Volts
GND
Signals: North, East, South, West,

I/O 0 to North
I/O 1 to East or West
I/O 2 to South
I/O 3 to West or East

IOPack:	1	2	3	4	5	6	7	Coil	The Dinsmore 1490 Compass Module requires connections to 4 I/O lines. These 4 I/O lines must be 4 contiguous I/O lines starting with I/O line 8, 12, 16, 20, 24, or 28. Each of the 4 I/O lines will require a pull up resister. If the I/O lines starting with 8 or 12 are selected, the internal pull up resisters can be used by setting the ooPIC.PullUp property to 1.
I/O 0:	8	16	24	5	12	20	28	a
I/O 1:	9	17	25	6	13	21	29	b
I/O 2:	10	18	26	7	14	22	30	c
I/O 3:	11	19	27	-	15	23	31	d