Link electronics Caption Encoder/Decoder SD SDI/Analog PTC-892, Инструкция по эксплуатации

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PTC-892 version 1 C 33
PTC-892 SOFTWARE INSTRUCTION SET (con’t)
Miscellaneous Instructions
^A? 01 3F Vendor and Version Inquiry: This directive is recommended
by EIA-608 to facilitate remote captioning. In response to
the “control A, question mark” inquiry, the PTC-892 sends
the following message back to the computer operator:
Link
Electronics Inc.
Model number: PTC-892
Firmware version: X X
^AO 01 4F
Hard Reset: The PTC-892 loads all of its default values and
does a hard reset. It loads values for I/O format, baud rates,
port selection, pedestal, weather lift, TSID, call letters,
encode, decode, and recovery modes. It then performs a full
reset similar to start up.
^AP 01 50
Disable Odd Parity: Stores the incoming data without adding
the “odd parity” bit typical of Closed Caption data. Useful for
data transmission unrelated to Closed Captioning.
^AQ 01 51
Disable Byte-Pair Doubling of Command Codes: While
Closed Caption command codes are typically transmitted
twice in successive video frames, this directive will cause
them to be transmitted only once. Useful for data
transmission unrelated to Closed Captioning, or to possibly
allow compatibility with captioning software which could
double the command codes before transmission to the
encoder via RS-232.
^AT 01 54
Test: This is used to test the encoder by encoding a test
message (similar to the ^A? response) into the CC1 and
CC3 data channels. Then the unit performs a reset (^AR).
^AU 01 55
Send time code: The PTC-892 responds by sending the
current time code out. Time code is four hexadecimal values
that represent Hours, Minutes, Seconds, and Frames. 20
hexadecimal is added to the values so they aren’t confused
with encoder directives or caption codes. Example when the
output in ASCII is #D7% which equals 23 44 37 25 in
hexadecimal, now subtract 20 hexadecimal from those
values and you get 03 24 17 05. The time code sent was
03:24:17:05.