Hitachi CP-X205 - Manual (Page 109)

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The TCP connection will be automatically disconnected after there is no
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Authentication
The projector does not accept commands without authentication success
when authentication is enabled. The projector uses a challenge response type
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commands to send.
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1) Select the projector.
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send the data.
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reply data will be returned. Otherwise, an authentication error will be returned.
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authentication data can be omitted when the same connection.
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