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5.3.13.
Null State
In the Null state, the encoder will insert Null characters for the selected data stream into line 21. Incoming
line 21 video will not be copied through on the data stream.
Command:
^A6<sp>fx<cr>
^A6<sp>dc<cr>
Default:
^A6<sp>F1<cr>
In the first form of the command, the optional parameter fx identifies the field (i.e. all streams in that field)
that will be placed in the Null state.
In the second form of the command the parameter dc identifies the data stream that will be placed in the
Null state.
Examples:
^A6<sp>F1<cr>
^A6<sp>C1<cr>
^A6<sp>T2<cr>
^A6<sp>TX<cr>
5.3.14.
Direct Control State
This command causes the encoder to enter the Direct Control state. The Direct Control state is normally
terminated by sending the End Of State command (^C), which will cause the encoder to revert to the Null
state.
Command:
^A3<sp>n<sp>fx<cr>data . . . data^C
or
^A3<sp>n<sp>dc<cr>data . . . data^C
Default:
^A3<sp>4<sp>F1<cr>
In the first form of the command, the optional parameter fx identifies the field (i.e. all streams in that field)
that will be placed in the Direct Control state. In the Direct Control state, caption information is inserted
into the appropriate video field in one of the four modes that are described below. All upstream caption
and text data in that field will be blocked. Any articles queued for insertion to that field will also be blocked.
The computer supplies all the information for that field, formatting it with the appropriate stream control
codes.
In the second form of the command, the optional parameter dc identifies the data channel that will be
placed in the Direct Control state. All upstream caption and text data in the specified data channel will be
blocked. Any articles queued for insertion to that data channel will also be blocked. The computer supplies
all the information for that data channel, formatting it with the appropriate stream control codes. All caption
information in the non-specified data channels will be passed through.
The optional parameter n identifies which variation of the Direct Control state will be used.
n=1
provides the same processing as n=2.
n=2
means that legitimate line 21 control codes are aligned and delayed so that the two byte
control
code pairs are transmitted in the same field.
SMPTE ST 2110/4K/3G/HD/SD Closed Caption Encoder with Media–to–IP Streaming
Field 1 in Null state
Captions 1 in Null state
Text 2 in Null state
XDS stream in Null state
Revision 1.0
MIO–CCE–4K/3G
Page - 59
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