VADDIO Extreme TX Specifications Page 116

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Integrator’s Reference Manual for Polycom HDX Systems
4–4 Polycom, Inc.
When Registered to Receive Notifications
Registering for notifications adds extra line responses in the form of API
registration responses. When your system is already registered to receive
notifications and you send an API command that affects a notification, an API
echo, API acknowledgement, and API registration response are returned. You
may receive multiple API registration responses if you are registered for
multiple notifications that are affected by the API command you are currently
sending.
For example, after your system has already been registered to receive camera
notifications (the notify vidsourcechanges API command enables these
notifications), the following responses are returned when you change the
camera source using the camera near 1 API command:
camera near 1 <CR>API command
returns
camera near 1<LF><CR>API echo
camera near 1<CR><LF>API acknowledgement
notification:vidsourcechange:near:1:Main:people<CR><LF>
API registration response
When your system is registered for notifications, always use the API
registration response (<CR><LF>), which indicates that the command was
sent, accepted, and processed. Never use the API echo (<LF><CR>), which
only indicates that you sent an API command but does not indicate whether
the API command you sent was actually processed. For example, you receive
an API echo even if you send an invalid API command. In this case, the API
echo responds by echoing the invalid API command that you attempted to
send.
End Of Line (EOL) Characters When Connected to the API Using a
LAN Connection
In software versions prior to 2.5.0.6, the EOL characters for the echo responses
on a system connected to the LAN and using a Telnet session were as follows:
camera near 2 <CR> API command
returns
camera near 2<CR><CR><LF> API echo
camera near 2<CR><LF> API acknowledgement
Starting with software version 2.5.0.6, the response changed to a single <CR>;
for example:
camera near 2 <CR> API command
returns
camera near 2<CR><LF> API echo
camera near 2<CR><LF> API acknowledgement
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