Local Caption Entry - EEG HD490 Manual

Local Caption Entry

Data Port Settings
Smart Encoder Command Format
17
This section covers methods for inputting closed captioning data into
your 490 Encoder using the serial ports or dial-up modem. The same
commands can for caption entry and settings can also be entered to the
HD490 Web Terminal
The serial data input ports (labeled 'P2' only for HD490) are factory
configured to use the RS232 protocol at 1200 baud, 7 data bits, and Odd
parity. To change these settings, see page 37. The dial-up modem is set
to operate at 2400 baud, but will also operate at 1200 baud without
explicit reconfiguration.
The Encoder controls the flow of data from input ports to the processing
queue using XON/XOFF handshaking protocol. XOFF will be sent
when the queue is over ¾ full. When the queue clears to ¼ full, XON
will be sent. The XON and XOFF characters are sent with a parity bit
determined by the parity setting of the port they are sent through.
Hardware handshaking is not supported and must be disabled when
connecting the Encoder.
To communicate through the serial data ports, connect the port to a PC
serial port with a standard 9-pin connector, and begin entering data
through a serial communications application such as HyperTerminal on
Windows. If you have trouble communicating using HyperTerminal,
always check to make sure that the settings in the Port Settings menu in
HyperTerminal match the settings for the Encoder port you are
connected to.
The 490-series Encoders maintain full compatibility with the industry
standard EEG Smart Encoder command set for closed caption data
entry. All Smart Encoder control commands begin with a leading
control code of <CTRL+A>, also represented by the ASCII hex code
01. A Smart Encoder control command must end with a carriage return;
use the <ENTER> key on a keyboard or 0D in ASCII hex. Note that
both the <CTRL+A> and <ENTER> characters are usually non-printing
in serial port communication programs.
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All Rights Reserved.
HD490 Smart Encoder