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HD9084 HDTV Caption Encoder Manual
SERIAL CONTROL PROTOCOL Page 4-11
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> Field 1 in Null state.
^A6<sp>C1<cr> Captions 1 in Null state.
^A6<sp>T2<cr> Text 2 in Null state.
^A6<sp>XD<cr> XDS stream in Null state.
4.3.14. 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.
n=3 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. Each control code pair is sent twice.
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