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SERIAL PROTOCOL
8083XDS-AD Analog and SD-SDI XDS Encoder
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>
4.4.3 Direct Control State
This command causes the encoder to enter the Direct Control state. 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 4 modes which 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.
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.
Revision 1.0.2
Field 1 in Null state
Captions 1 in Null state
Text 2 in Null state
XDS stream in Null state
The computer
Page 4-13
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