evertz 8074 User manual

Model 8074 Digital Video Closed Caption Encoder Manual
8074 Manual Change Sheet 1.0-2
Date of Issue: July 15, 1999 Page 1of 5
Copyright Evertz Microsystems Ltd. All rights reserved
The following document describes the operational changes to the 8074 related to firmware version
990715. References to the 8074 manual are to version 1.0 printed February 1998.
1. Overview of New Features
•Serial Port B may be configured to echo out serial commands received through other serial ports.
•Closed caption data may be extracted and output directly to serial port B.
•Closed caption data may be input through port B and inserted directly into the outgoing SDI video.
•Text article line length has been increased to accommodate longer WebTV links.
2. Port Passthrough Features
Through the Engineering Setup menu system, the user may now place the 8074 into one of several
serial port passthrough modes. The new modes are referred to as “Port Passthrough” and “Caption
Data Passthrough”. These modes allow control commands or closed caption data to be cascaded from
one 8074 to another through the serial ports. This functionality is useful for copying captions from one
video stream to another, or to re-insert captions that have been removed or damaged by processing
operations.
All of the new port B passthrough modes require port B of the 8074 unit to be connected to a serial
port of another 8074, an 8075 or an 8070 depending on the application.
2.1 Port Echo Modes
These modes cause serial commands received on the respective serial port or modem port to be
echoed out of serial port B. These commands may then be cascaded to a second 8074 using a serial
interface cable as described in section 2.3. The successive unit(s) will then receive the same serial
commands as the first unit, after a slight propagation delay. The receiving unit does not need to be
placed in a special operating mode, and may be another 8074, an 8075 or an 8070 unit.
The following figure depicts a typical configuration to use the Port Echo Modes.
8074
"Port Echo Mode"
8074
"Port Echo Mode"
8070/8074/8075
Caption
Commands
Port A, C or D
Port A or C
Port B
Caption
Commands
Port B
Any serial port
Captioning Computer
Caption
Commands
SDI In
SDI In
SDI In
SDI Out
SDI Out
SDI Out
Figure 1: Connections for Port Echo Mode

Model 8074 Digital Video Closed Caption Encoder Manual
8074 Manual Change Sheet 1.0-2
Date of Issue: July 15, 1999 Page 2of 5
Copyright Evertz Microsystems Ltd. All rights reserved
2.2 Caption Data Passthrough Modes
To use these modes, one 8074 is configured to extract caption data and transmit it via the serial port.
Another 8074 unit is configured to receive caption data over the serial port and insert it into the SDI
video. This ability is useful for copying captions from one video stream to another, or reinserting
captions into video after it has been passed through a standards converter or other device that
damages the caption data.
8074
"CC Xmit"
8074
"CC Recv"
Caption
Data
Port A, C or D
Port B
Port B
Captioning Computer
Caption
Commands
SDI In with
upstream captions
SDI In
SDI out with
captions
SDI out with
captions
Figure 2: Setup to Copy Captions Between Video Streams
8074
"CC Xmit" 8074
"CC Recv"
Port B Port B
SDI In with
upstream captions SDI out with captions
Standards
Converter
Caption Data
Figure 3: Re-Inserting Captions Into a Video Stream

Model 8074 Digital Video Closed Caption Encoder Manual
8074 Manual Change Sheet 1.0-2
Date of Issue: July 15, 1999 Page 3of 5
Copyright Evertz Microsystems Ltd. All rights reserved
2.3 Configuring 8074 for Port Passthrough Modes
This new functionality must be enabled through the 8074 front panel controls. A new Engineering
Setup menu item has been added called >PORT B FUNCTION. This menu is accessed by entering
the Engineering Setup menus using the SHIFT+SETUP key combination. Then use the up arrow until
the >PORT B FUNCTION prompt is displayed. Use the LEFT ARROW or RIGHT ARROW keys until
the desired function is displayed (the currently active function will be blinking). Press the SELECT key
to change the function of Port B to the currently displayed function. (The function text should start
blinking). Use the SETUP key to exit the menus.
PORT B FUNCTION is used to select the operating mode of the Port B serial port.
Funct B Normal is used for standard 8074 interface to captioning computers and software.
Funct B Echo Px where x=(A, C or D) initiates one of the “Port Echo” passthrough modes.
For any “Funct B Echo Px” (Port Echo) mode, use the cable described by Figure
4 if you wish to connect to port B or port C of the cascaded encoder unit.
The 8074 may also be connected to port A of the receiving encoder, which may
be an 8070, 8074 or 8075. To connect to port A of the receiving encoder, use a
cable with the pinout described in Figure 5.
In this mode the user is responsible for configuring identical baud rates and data
words on the serial ports of the transmitting and receiving units.
Funct B CC Xmit will extract all captions from the output video and transmit them out of serial port
B. To use this “Caption Data Passthrough” mode, port B must be connected to
port B of another 8074 that is configured for Funct B CC Recv mode (see
below). To connect the units, use a standard “NULL MODEM CABLE” having the
pinout described in section 2.3.
?
>PORT B FUNCTION
Funct B Normal
Funct B Echo PA
Funct B Echo PC
Funct B Echo PD
Funct B CC Xmit
Funct B CC Recv

Model 8074 Digital Video Closed Caption Encoder Manual
8074 Manual Change Sheet 1.0-2
Date of Issue: July 15, 1999 Page 4of 5
Copyright Evertz Microsystems Ltd. All rights reserved
In this mode the port B data word is set and locked to “8 none”. The user is
responsible for configuring identical baud rates on serial ports B of the
transmitting and receiving units.
Funct B CC Recv configures an 8074 to encode closed caption data received over serial port B
directly into the video. This is the receiver side of “Caption Data Passthrough”
mode. When this function is selected, the 8074 encoder is placed and locked
into field mode. All upstream captions are blocked. All other communications
ports are blocked so that they will not provide caption data. Additionally, the
internal test message is disabled.
In this mode the port B data word is set and locked to “8 none”. The user is
responsible for configuring identical baud rates on the serial ports of the
transmitting and receiving 8074 units.
It is not possible to select “Funct B CC Recv” operation if any other port is
currently supplying caption data to be encoded into the video stream.
The Caption Data Passthrough setup will introduce a delay in the captions on the
receiver side, typically one to three frames. Other equipment in the SDI video
stream also influences the length of this delay.
?
?
?
?

Model 8074 Digital Video Closed Caption Encoder Manual
8074 Manual Change Sheet 1.0-2
Date of Issue: July 15, 1999 Page 5of 5
Copyright Evertz Microsystems Ltd. All rights reserved
2.3 Physical Connections for Passthrough Modes
8074 Port B Other Encoder Port B or Port C
Female Female
Description DB-9 DB-9 Description
Shield -------------------------- Shield
RS 232 Transmit 3-------------------------- 2RS 232 Receive
Ground 5-------------------------- 5Signal Ground
RS 232 Receive 2-------------------------- 3RS 232 Transmit
RS 232 CTS 8-------------------------- 7RS 232 RTS
RS 232 DTR 4-------------------------- 6RS 232 DSR
RS 232 RTS 7-------------------------- 8RS 232 CTS
RS 232 DSR 6-------------------------- 4RS 232 DTR
Figure 4: “NULL MODEM” Cable Wiring Diagram 8074 Port B to Port B or Port C
8074 Port B Other Encoder Port A
Female Male
Description DB-9 DB-9 Description
Shield -------------------------- Shield
Ground 1-------------------------- 1Ground
RS 232 Receive 2-------------------------- 5RS 232 Transmit
RS 232 Transmit 3-------------------------- 8RS 232 Receive
Ground 5-------------------------- 6Ground
RS 232 CTS 8-------------------------- 4RS 232 RTS
Figure 5: Cable Wiring Diagram 8074 Port B to Port A