ICD-001 Camera Command

Introduction

This page covers the ICD-001 Camera Command.

<!—MsgId is the unique id of the message being sent -->
<!—CommandType defines the type of action required -->
<!—CameraId is the unique id of the camera being controlled -->
<?xml version="1.0" encoding="utf-8"?>
<CameraCommand xmlns=”http://navtechradar.com/CameraCommand” xmlns:xsi="http://www.w3.org/2001/XMLSchema-Instance"
    MsgId="21" MsgTimeStamp="2012-02-14T11:23:15" CommandType="ManualOverride" CameraId="2">
  <!-- The sender element is optional -->
  <Sender SenderId ="XFSControlSuite:1" NetworkAddress="192.168.24.5" NetworkPort ="2077"/>
</CameraCommand>

Camera Command Element

The camera command instruction provides a series of messages to control one or more cameras. Currently there is only one message types. Descriptions and examples are provided in this section.

Camera Command Attributes

Attributes	Description	Type	Notes
MsgId	Unique message Id	Long	This must be globally unique across all message types
MsgTimeStamp	Date and time that the message was sent	DateTime
CommandType	Type of Camera Command: ManualOverride - tells Witness to suspend automatic control of a camera	CameraCommandTypeList
CameraId	Id of the camera which is the target for this message	Int	This must match the configured User Id for the target camera in Witness
ExternalCameraId	External Id of the camera which is the target for this message	string	This must match the configured External Id for the target camera in Witness, if this is present the system ignores CameraId

Payload Element

The payload carries data specific to a command. Each command that requires a payload is detailed in this document and each of the payload elements is included within the appropriate XSD.

The payload is reserved for future use and has not yet been implemented for the camera command instruction.

Network Sender Element

Each incoming message can include an optional Sender element. This must include the IP address and port that the client is using to send instructions.

If the Sender element is included the NetworkAddress value will be checked against the subscriber IP address and the command rejected if they do not match.

In addition the Sender element is included in the Command Reply. This is a duplicate of the incoming details (i.e. the subscribers IP address and port). The subscriber can use this to verify that they authored the message.

Manual Override

This command will inform Witness that an external operator or system is taking control of a camera. When Witness receives this command it will suspend automatic control of the specified camera.

This command should be sent repeatedly whilst the external system requires to maintain control of the camera.

When Witness receives this command it starts a timer. The duration of this timer is set within the Witness configuration, but by default it is 10 seconds. If another command is not received before this timer expires then Witness will resume automatic control.

So this command must be sent at an interval which is less than the configured timeout. Assuming the timeout is 10 seconds we would recommend sending a command every 2 seconds whilst the external system requires control of the camera.

To avoid excessive load on the camera controller it is not recommended to send this command more than once a second.

Related Information

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ICD-001 Track Filter Command (Witness 4.0)
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ICD-001 Acknowledge Alarm Command (Witness 4.0)
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ICD-001 Request Status Command (Witness 4.0)
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ICD-001 Detection Command (Witness 4.0)
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ICD-001 Update Entity Command (Witness 4.0)
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ICD-001 System Profile Command (Witness 4.0)
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ICD-001 External Trigger Command (Witness 4.0)
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ICD-001 Command Reply (Witness 4.0)
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ICD-001 Camera Command (Witness 4.0)
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ICD-001 Track Command (Witness 4.0)