Snell MV-16, Руководство пользователя

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MV-16 Multiviewer www.snellgroup.com Hydra Open Protocol
Issue 1 Rev 12 Page 79 © 2013 Snell Limited
Appendix A. Hydra Open Protocol
A.1 Introduction
The MV-16 contains a selection of the commands defined in the Barco Hydra Open Protocol.
They have been adapted to control the MV-16 in as close as possible way as they would
control a Hydra, with the aim being to enable existing scripts already used with a Hydra to be
utilized. This protocol uses XML to control certain features of the MV-16 in a user-friendly way
on a LAN.
A.2 Formatting
All messages sent to and received from the MV-16 use XML formatting, with each message
enclosed in the tag XML. The first element inside the XML tag is always PACKET. The
structure is always of the format:
<XML>
<PACKET MODULE="MV-16" VERSION="1.0">
…
</PACKET>
</XML>
The
MODULE
and
VERSION
attributes in the
PACKET
element are not essential - they are
simply there to comply with the Hydra Open Protocol, but are ignored by the MV-16. The
response to this will be the same.
A.3 Connections
The Hydra Open Protocol has two types of connections - one for transactions and one for
event handling. However, the MV-16 currently only supports transaction types. This is done
using TCP port 8881. The normal procedure for sending transactions is:
• Connect using TCP port 8881 to the MV-16
• Send a transaction as XML formatted text
• Receive the result of this transaction as XML formatted text
• Repeat this procedure for further transactions. The connection can be kept open for
as long as necessary.
• Close the socket when finished.