HD9084 HDTV Caption Encoder Manual
SERIAL CONTROL PROTOCOL Page 4-9
Example results: Battery OK
4.3.10. Set / Report Time of Day Clock
This command will return the current time of day or will allow the internal clock to be set. The unit will
maintain the correct time even through power outages.
Command: ^Ac<cr>
Example results:
Local time is 13:47:39, Time zone is 05:00, DST is ON, DSO is ON
Command: ^Ac<sp>U<cr>
Example results:
UTC is 19:47:39, Time zone is 05:00, DST is ON DSO is ON
Command: ^Ac<sp>hh:mm:ss<sp>hh:mm<sp>dst<sp>DSO=dso<cr>
hh:mm:ss Local time
hh:mm Time zone offset
dst OFF Daylight Saving Time not in effect (DST Bit Off)
ON Daylight Saving Time in effect
(DST Bit On)
dso OFF Daylight Saving Time not observed in this region
(DSO Bit Off)
ON Daylight Saving Time observed in this region (DSO
Bit On)
Although the time zone must be entered as hours and minutes, the XDS Time
Zone packet will only transmit the time zone hours. This is a limitation of the
definition of the time zone packet in CEA-608.
Example: ^Ac<sp>13:10:00<sp>5<sp>ON,<sp>DSO=ON<cr>
Set local time to 1:10 pm in EDT (Daylight Saving Time in effect), Daylight Saving Time
observed.
^Ac<sp>13:10:00<sp>5<sp>ON,<sp>DSO=OFF<cr>
Set local time to 1:10 pm in EST (Daylight Saving Time in effect), Daylight Saving Time
not observed. (E.g. as in Indiana)
^Ac<sp>06:10:00<cr>
Set local time to 6:10 am. Time zone, DST and DSO unchanged.
^Ac<sp>13:10:00<sp>4:30<sp>OFF<sp>DSO=ON<cr>
Set local time to 1:10 pm in Newfoundland Time Zone with Daylight Saving Time not in
effect, but Daylight Saving time observed
The DST bit instructs the encoder whether Daylight Saving Time is currently in effect. The DSO bit
instructs the encoder whether Daylight Saving Time is observed in this region. The encoder must know
this information when converting between local time and UTC time internally. Most regions in North
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