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HD9084 HDTV Caption Encoder Manual
Page 4-22 SERIAL CONTROL PROTOCOL
^AO C1 O<cr>
This command forces the current port to be active in field 1 captions. Activity for
other data types remain as previously set. If any other control port is active in
CF1 will be reset.
4.6.5. Reset Port
This command will reset a port. This command immediately clears the input and output data queues
and resets the HD9084 to the Transparent State in Field 1 and Field 2. Article and XDS output queues
are not reset by this command. They must be explicitly reset by using the queue articles and queue
XDS commands. Since other control ports may be simultaneously sending data, this command only
affects the fields and data types that have not been appropriated by other control ports. To reset all
communication ports, see the Reset Encoder (^F^F) command in section 4.3.2.
Command: ^Ar<sp>pn<cr>
Example: ^Ar PB<cr> Resets Port B
4.7. GPI MESSAGE INJECT
The GPI Message Inject feature stores a 68 character message internally in the HD9084 and plays it
out upon GPI contact closure.
4.7.1. Managing Message Text
Entering the Control-A command ^AG by itself, from any serial port, will display the current contents of
the message.
The default text is:
~~~The current program~is not captioned .
The message is entered from any port using the ^AG command, eg: ^
AG ~~~This is the~message text .
The longest message that can be stored is 68 characters in length, including all tilde (~) characters.
Note that each CEA-608 caption line may contain a maximum of 32 characters.
Any tilde (~) character will be replaced with a carriage return (CR) when the message is encoded,
allowing multi-line text messages to be entered. One or more CRs should be put at the beginning of
the message, but none at the end. Otherwise the caption would roll-up one extra line and the last line
would always be blank. For best presentation, it is recommended that 3 CRs (~~~) be placed at the
beginning of the message text to ensure that all previous text is cleared from the display window before
new text appears.
4.7.2. Activating Message Inject
To setup a GPI to control insertion of the text message, navigate the front panel menu PORTS->MSG.
INJECT GPI then select the GPI that will control this feature.
To select which CC channel the message is injected onto, navigate to PORTS->MSG. INJECT CCx.
The factory default is "CC1".
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