EEG HD490 - Local Caption Entry

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HD490 Smart Encoder

Local Caption Entry

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

Data Port Settings

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.

Smart Encoder Command Format

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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