EN530 HDTV Smart Encoder IV
Format
VANC Insertion Lines
24Psf 9-20
720p 9-25
1080i 9-20
SD 12-20
333 Serial Output
In 333 serial output, the EN530 sends its 708 caption output to a serial output
queue for transport to an ATSC encoder supporting SMPTE 333M protocol.
333 is a “pull” protocol; the ATSC encoder sends synchronization requests
(SYNs) to the EN530, which then sends the requested data bytes out through
serial port P1. The SMPTE 333M specification should be referred to for
complete information about the protocol.
To set the EN530 for 333 serial output, simply connect P1 to the captioning
port of a SMPTE 333M ATSC encoder. When the EN530 begins receiving
SYNs it will automatically begin 333 output. P1 is default configured for the
proper communications settings for 333 (38400 Baud, 8 data bits, no parity,
and one stop bit).
The command to manually set the Encoder for 333 output
and set P1 to the proper settings is
<CTRL+A>f 333 <ENTER>
.
GA Serial Output
In GA serial output, the EN530 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 EN530 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 31 of this manual.
Since the Encoder initiates data transfer with a Grand Alliance ATSC encoder,
GA output must be initialized manually. The command to set the Encoder for
GA output is
<CTRL+A>f ga <ENTER>
. This command will begin the GA
serial output operation and set P1 for the proper communications rate (19200
Baud, 8 data bits, no parity, and one stop bit).
Each time the EN530 is power cycled, it will automatically return to VANC
Insertion output mode. If a SMPTE 333M ATSC encoder is connected to P1,
however, 333 serial output will begin as soon as SYNs are received. If GA
serial output is always desired, the GA output initialization command should
be stored in Non-Volatile Memory to reduce setup time. If the command is
stored in NVM, GA output will automatically begin each time the Encoder is
power cycled. To write a command to NVM, see page 24.
When either 333 or GA serial output is engaged, no VANC caption data
will appear on the HD video output.
©2000-2007 EEG Enterprises, Inc.
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