EEG 491 Series, Руководство пользователя

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HD491 Smart Encoder
23 Copyright © 2000-2014 EEG Enterprises, Inc.
All Rights Reserved.
Format VANC Insertion Lines
24Psf 1124, 1125, 1-20
720p 746-750, 1-25
1080i 561, 562, 1-20
1080p 1122–1125, 1-41
333 Serial Output In 333 serial output, the Encoder sends its 708 caption output to a serial
output queue to wait for transport to an ATSC encoder supporting the
SMPTE 333M protocol. 333 is a “pull” protocol; a properly configured
ATSC encoder will send synchronization requests (SYNs) to the caption
encoder, which then sends data chunks from the output queue to serial port
P1. For complete information about the protocol, refer to the SMPTE
333M specification.
To set the Encoder for 333 serial output, simply connect P1 to the
captioning port of a SMPTE 333M ATSC encoder. When the Encoder
begins receiving SYNs, it will automatically enter the 333 output mode.
P1 is default-configured on startup for the proper communications
settings to listen for 333 (38400 Baud, 8 data bits, no parity, and one stop
bit).
To
set the Encoder for 333 output manually, and set P1 to the proper
listening settings, use <CTRL+A>f 333 <ENTER> .
GA Serial Output
In GA serial output, the Encoder sends its 708 caption output to a serial
output queue for transport to an ATSC encoder supporting Grand
Alliance (GA) protocol. Grand Alliance is a “push” protocol; the caption
encoder sends data out through P1 as it becomes available, and the ATSC
encoder synchronizes the data upon reception. The Grand Alliance
transport protocol in use by EEG equipment is described on
Page 45 .
Since the caption encoder initiates data transfer with a Grand Alliance
ATSC encoder, GA output must be begun manually. The command to set
the Encoder for GA output is
<CTRL+A>f ga <ENTER> . This
command will begin the GA serial output and set P1 for the proper
communications rate (19200 Baud, 8 data bits, no parity, and one stop
bit).
Note that, each time the HD491 is power cycled, the default startup
behavior is to return to the HD VANC Insertion mode. If a SMPTE 333M
ATSC encoder is connected to P1, 333 serial output will begin as soon as
SYNs are received. If GA serial output is the desired mode on each
startup, the GA output command can be stored in Startup Settings used
the web-based Startup Settings Editor. If the command is stored in the
startup settings, GA output will automatically begin each time the
Encoder is power cycled.
When either serial output mode is active, no VANC caption data will
appear on the HD video output.