HDMI20-OPTC series – User's Manual 44
Signature
DEFINITION: The signature is a four-digit-long hexadecimal value that can be optionally placed before
every command to keep a command and the corresponding responses together as a group.
Each line is terminated with a carriage return (Cr, ‘\r’) and line feed (Lf, ‘\n’) characters. In several cases the
number of the lines in the response cannot be determined in advance, e.g. the client intends to receive for the
whole response and also wants to be sure, that the received lines belong together and to the same command.
In these cases, a special feature the ‘signature’ can be used. The response to that particular command will
also be preceded by the signature, and the corresponding lines will be between brackets:
Ý
Ü {1700
Ü
Ü
Ü
Ü
Ü
Ü
Ü }
INFO: The lines of the signature are also Cr and Lf terminated.
Subscription
changes.
the client application up to date, without having to periodically poll the node to detect a changed property.
the node.
ATTENTION! The subscriptions are handled separately for connections. Hence, if the connection is
terminated all registered subscriptions are deleted. After reopening a connection all subscribe commands
Subscribe to a Node
Ý
Ü
Get the Active Subscriptions
Ý OPEN
Ü
Ü
Ü
Subscribe to Multiple Nodes
Ý
Ü
Unsubscribe from a Node
Ý
Ü
Unsubscribe from Multiple Nodes
Ý
Ü
format of such a message is very similar to the response for the GET command:
Ü
A Short Example of How to Use the Subscription
There are two independent users controlling the device through two independent connections (Connection #1
and Connection #2). The events in the rows occur after each other.
Ý
Ü
Ý
Ü
Ý
Ü
Ý
Ü
Ü
Explanation: Connection #1) set a subscription to a node. Later the other user (Connection #2)
Legend for the Control Commands
Format Description
Input port number
Output port number
Input or output port number
Location number
command
Batched parameters: the underline means that
more expressions or parameters can be placed by
using a semicolon, e.g. I2;I4;I5 or F27:E1;F47:E2
Ý
Sent command
Ü
Received response
• Space character
Connection #1
Connection #2
Connection #1
}
}
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