INSTRUCTION MANUALINSTRUCTION MANUAL

PDP-886

DIGITAL CLOSED CAPTIONENCODER & DECODER

LINK ELECTRONICS, INC.

2137 Rust AvenueCape Girardeau, Missouri 63703Phone: 573-334-4433Fax: 573-334-9255

e-mail: sales @ linkelectronics.comwebsite: www.linkelectronics.com

1

TABLE OF CONTENTS

GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3

OPERATIONAL SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4

TECHNICAL SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 5-7

TECHNICAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 8-10

PRODUCT WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11

SERVICE INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11

FCC DOCUMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12

MODEM INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13

DIGITAL MODULE PARTS LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 14-15

SOFTWARE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 16-19

MOTHER BOARD PARTS LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 20-21

TSID INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 22-23

2

PDP-886 GENERAL DESCRIPTION

The LINK PDP-886 is designed to insert Closed Caption data into a component serialdigital data-stream. Its data handling capability is built on two on-board 8-bitmicro-controllers, each with their own serial data ports and optional internal modems.

The serial digital video input is terminated into 75 . There are two encoded serial digitaloutputs plus two encoded composite analog outputs. In addition, a built-in ClosedCaption decoder provides two additional composite analog outputs with decoded captions for monitoring purposes.

Closed Caption data input utilizes a nine-pin Subminiature D connector. Both RS-232and RS-422 interface standards are supported. Two built-in modems (optional) provide direct connection to a telephone line for remote captioning applications. Communication baud rate is set by a front panel DIP switch.

The actual Closed Caption data waveform is digitally generated for complete accuracy. The user may encode on Line 21 (NTSC) or Line 22 (PAL) in either Field 1 or Field 2. Abuilt-in EDH (Error Detection and Handling) processor can monitor the incoming signalfor impairments and insert new EDH data. This function will insure that the output EDHChecksum will reflect the change introduced by the Closed Caption data waveform.Operational status reporting is handled by a front panel LCD display. TransparentBy-Pass may be selected from the front panel. An encoded test message may also beselected from the front panel.

The internal Closed Caption Decoder is controlled by a front panel rotary switch. A totalof nine data channels may be selected: CC1, CC2, T1, and T2 in Field 1 along withCC3, CC4, T3, T4, and XDS in Field 2.

Housed in a rugged 1RU chassis, the PDP-886 is backed by LINK's unmatched 10-yearwarranty.

FEATURES

*AUTOMATIC STANDARD DETECTION: NTSC OR PAL*TWO ENCODED SERIAL DIGITAL OUTPUTS*TWO ENCODED ANALOG OUTPUTS*TWO DECODED ANALOG OUTPUTS*RS232 OR RS422 DATA INPUTS, INTERNAL SWITCH SELECTABLE*ENCODE/DECODE FIELD 1 AND FIELD 2*EDH PROCESSING*OPTIONAL MODEM

3

PDP-886 SPECIFICATIONSDIGITAL INPUT:

Number One (1)Standard: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMPTE 259M-C 270Mb/sConnector: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75S BNCImpedance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75S ± 1%Return Loss: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >18dB to 270MHzSignal Level: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800mV ± 10%

DIGITAL OUTPUT:Number: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Two (2)Standard: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMPTE 259M-C 270Mb/sConnector: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75S BNCImpedance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75S ± 1%Return Loss: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >18dB to 270MHzSignal Level: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800mV ±10%

ANALOG ENCODER OUTPUT:Number: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Two (2)Level: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Vp-pImpedance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75S ± 1%Connector: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75S BNCStandard: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NTSC/PAL COMPOSITESNR: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >65dBDifferential Phase: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <1.0 Differential Gain: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <1.5%

ANALOG DECODER OUTPUT:Number: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Two (2)Level: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Vp-pCharacter Video: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 IRECharacter Background: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 IREImpedance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75S ± 1%Connector: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75S BNCStandard: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NTSC/PAL COMPOSITESNR: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >65dBDifferential Phase: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <1.0 Differential Gain: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <1.5%

DATA INPUTS:RS-232/422: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Two (2), 9-pin D SubModem (Optional): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Two (2), RJ-11Default Protocol: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200,n,8,1Baud Rates: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200, 2400, 4800, & 9600

FRONT PANEL: AC Power: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ON/OFF By-Pass: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Push/Push, Maintained Test: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Push/Push, Momentary Three Position DIP Switch: . . . . . . . . . . . . . . . . . . . . . . . . . . . Selects Baud Rates and Negative Pedestal LED Indicators: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Serial Data Presence, Pedestal Modem LED's: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RI, OH, CD, Each Modem

LCD Display:Encoding Mode, Field 1 or Field 2 . . . . . . . . . . . . . Decoding Mode, CC1, CC2, T1, T2, CC3, CC4, or XDS

Standard, NTSC or PAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baud RateENVIRONMENTAL: Temperature: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to 50° C Ambient Humidity: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10% to 90% non-condensing AC Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 to265 VAC, 50/60Hz

Power: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Watts Max.MECHANICAL:

Height: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.750" Width: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19"

Depth: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12"

4

PDP-886 OPERATIONAL SETUP

INPUTS: Component Serial Digital Video:(SMPTE 259M), either NTSC or PAL. ThePDP-886 performs automatic standard detection and encodes captiondata on Line 21 (NTSC) or Line 22 (PAL) as required.

Caption data input: Two RS-232C via 9-pin Subminiature "D" connectors. Both are female, wired as DCE for direct connection to a computer. Baudrate may be selected at the front panel using the miniature DIP switch. Protocol may be 8-bit no parity, or 7-bit odd/even parity.

Modem input: optional 1200/2400 baud modems are available. Frontpanel indications for each modem are:

RI = Ring IndicationOH = Off HookCD = Carrier Detect

Power input: Unit is designed for "universal input" operation. AC mainsmay be 85-264Vac, 50-60Hz.

OUTPUTS: Digital Encoder: Two 10-bit serial digital outputs with digitally generatedcaption data plus EDH checksum.

Analog encoder: Two 8-bit composite analog video outputs (NTSC or PAL)with closed caption data.

Analog decoder: Two 8-bit composite analog video outputs (NTSC or PAL)with closed caption data and decoded captions as selected at the frontpanel. Nine data channels are supported, including Extended DataServices (XDS). Supports the EIA-608 extended character set.

DIGITAL CODING OPTIONS: ZERO/NEGATIVE PEDESTAL

To insure compatibility with down-stream digital to analog converters, the PDP-886 can generate a Line 21 waveform with a "negative-pedestal." Some broadcast D/A converters add a 7.5IRE pedestal starting at Line 20 even though IT IS UNDESIRABLE TO ADD PEDESTAL TO THE LINE 21 CLOSED CAPTION WAVEFORM. The front panel miniature DIP switch position #1 allows the user to accurately cancel the effect of the added pedestal. If the front panel "Pedestal" LED isON, negative-pedestal coding is in effect.

5

NOTE: THIS UNIT WAS COMPLETELY CALIBRATED BEFORE IT WAS SHIPPED.USE THIS FACTORY SETUP PROCEDURE ONLY IF NEEDED!

PDP-886 TECHNICAL SETUP

Firmware version 1.0A

1. Mid-range all internal pots. Apply an NTSC Serial Digital Interface (SDI) signal to the input BNC, P2. Outputs should be connected to appropriate monitoring equipment: the serial digital output signal should be connected to a Tektronix 601i/eor other SDI monitoring device. Note: internal relay by-passing should allow theinput signal to loop through the PDP-886 from BNC P2 to BNC P1 before power-up. The analog outputs should be connected to a video test system consisting of awaveform monitor, oscilloscope, video monitor, and (optional) vector-scope. Also, acomputer with a serial "COM" port will be required. If the PDP-886 under test hasan internal modem, the test system will require a modem as well with a telephoneline connection (or telephone line simulator).

2. Power unit up slowly with a VariAC or other variable auto-transformer. Check for excess current. Check internal regulated voltages at connector J6. In order, frontto back, the power supply voltages should be +12Vdc, +5Vdc, and -12Vdc.

3. Connect a voltmeter to TP3 on the digital I/O board. While monitoring the digital video output, adjust RV7, also on the digital I/O board, until the picture just locks. Measure the voltage at TP3 and continue to adjust RV7 until TP3 changes by 250mV from the original lock point.

4. Examine the electrical characteristics of the digital video bitstream at BNC P1. Level should be 800mV ±10%. Eye pattern display should show approximately 1ns rise times with over-shoot <5%. Jitter should be <750ps. (Less than .20 Unit Intervals.) Error Detection and Handling (EDH) checksum should be present. Data should be error free.

5. The front panel Liquid Crystal Display (LCD) should indicate the following:

Encode = "Off"Standard = "NTSC"Decode = "CC1"Baud Rate = "1200"

Adjust RV1 on the mother board for optimum LCD contrast. All front panel LEDs should be dark.

6

PDP-886 TECHNICAL SETUP (CON'T)

6. Examine the analog encoder output at BNC J5 or J6. Adjust RV2 on the digital I/O board for 1Vpp composite analog video output.

7. Examine the analog decoder output at BNC J8 or J9. On the digital I/O board, adjust RV3 for output back porch at 0Vdc. Next, adjust RV6, also on the digital I/O board for 1Vpp video output.

8. Connect the PDP-886 for data input from a personal computer using an RS-232 interface. The connection should be made to the female 9-pin subminiature "D", J2. The computer should be running a terminal program that will allow ASCII charactersto be transmitted via the serial port. Protocol should be 1200,n,8,1.

9. From the computer, type ^A?. Note: the symbol ^ indicates the "Ctrl" key on the computer keyboard. You should hold the "Ctrl" key down while pressing the "A"key. Release the "Ctrl" key before pressing the "?". All commands requireupper-case characters; therefore, "Caps Lock" = ON. With each character from thecomputer, the front panel "Data 1" LED should light briefly. In response to the ^A?command, the PDP-886 should respond with the following message:

LINK Electronics, Inc. MODEL NUMBER: PDP-886 SOFTWARE VERSION: X.Xx

This will confirm bi-directional communication of the PDP-886 data port.

10. From the computer, type ^A3. The Closed Caption waveform should appear on Line 21 in Field 1. Confirm at both digital and analog outputs. LCD should also indicate waveform presence ("Encode") on Field 1.

11. Reset the PDP-886 by issuing a ^AR command from the keyboard. Reset will cause the LCD to re-write, with the Encode field indicating "OFF."

12. Move the RS-232 data cable to the second 9-pin subminiature "D" connector, J1, on the PDP-886. Repeat steps 8 through 11.

13. Next, invoke a compatible Closed Caption software program on the computer. A list of compatible software vendors is available from LINK Electronics, or may be found at: http://www.linkelectronics.com/htm/whoswho.htm. Using an appropriate caption data file, begin the encoding process in CC1. The internal closed caption decoder should be set to CC1 as well.

14. Observe the output (analog) decoded captions. On the digital I/O board, adjust RV4 to set the character background level to 10IRE units. Next, adjust RV5 for character luminance level at 90IRE units.

7

PDP-886 TECHNICAL SETUP (CON'T)

15. For advanced testing, use a second computer to simultaneously send caption data for Field 2, Line 21. This computer should be connected to the second serial port, J1, and should run appropriate software to encode CC3 or XDS (V-Chip)data. With each character from the second computer, the "Data 2" LED shouldlight briefly. The internal closed caption decoder may be set to the appropriatedata channel to confirm the accuracy of the Field 2 encoding.

16. Interrupt the caption software programs and return to a terminal program that will allow ASCII characters to be transmitted via the serial port or, in this case, via internal or external modem. By telephone line connection (or by telephone line simulator), connect the computer's modem to the PDP-886's modem. Note: you cannot connect a telephone wire directly from modem to modem.

17. Use the computer's terminal program to "call" the PDP-886's modem. If you are using a telephone line simulator, it may only be necessary to issue the "ATDT" command with no accompanying telephone number required. Note: the "ATDT" command is part of the "AT Command Set" established by Hayes Microcomputer Products, Inc. When the call is initiated, confirm the following:

a.) The red "ring indicator" (RI) LED should light for the appropriate modem

b.) The yellow "off hook" (OH) LED should light when the PDP-886 "answers." c.) The green "carrier detect" (CD) LED should light when the two modems

have established contact.

18. Once connected via the modem, the PDP-886 should respond to commands as though connected via the 9-pin serial port. You may repeat steps 9-14 as desired and the results should be the same. However, the simple ^A? commandwill serve to confirm the bi-directional connection through the modem and nofurther testing should be required.

19. If a second modem is installed in the PDP-886, repeat steps 16 through 18.

Field performance testing of the PDP-886 is now complete.

8

PDP-886 TECHNICAL DESCRIPTION

DIGITAL VIDEO PROCESSING/ENCODING

Serial Digital Interface (SDI) connection is via BNC P2 (Sheet 1 of 4). Relay K1provides power-off by-passing of the input signal to the output BNC, P1. Receiverdevice U21 performs automatic gain and cable equalization. Integrated circuit U22performs the digital re-clocking function and provides a re-clocked serial digital output(pins 24 and 25) along with a recovered clock output (pins 22 and 23). Thephase-locked loop error voltage appears at TP3, and may be adjusted by RV7. Serialto parallel conversion is accomplished by U23. This 10-bit multiplexed (Y,Cr,Cb) signalis connected to the dual multiplexer device, U8. This Complex Programmable LogicDevice (CPLD) has the following functions:

1. Sync separator: produces vertical sync and provides field identification to the micro-controller on the mother board. Also provides horizontal and vertical resetto the address generator CPLD, U9.

2. Dual Multiplexer/Keyer: multiplexes luminance (Y) data from ROM (U4/U5) with fixed color difference (Cr,Cb) data to produce a Closed Caption waveform. This digital Closed Caption signal is then multiplexed (keyed) into the digitalbit-stream during the appropriate line: NTSC = line 21, PAL = line 22.

Waveform synthesis is handled by the address generator CPLD, U9. It receives ClosedCaption data from the micro-controller and generates the appropriate addresses for thewaveform ROMs. (NTSC waveform ROM = U4, PAL waveform ROM = U5.)The digital video bit-stream has now been modified with the insertion of line 21/22Closed Caption data. The parallel video data is next applied to U7, the EDH (ErrorDetection and Handling) processor. Here, a new EDH checksum is added to reflect themodification to the video data. Finally, U6 provides the parallel to serial conversion. SDI output appears at BNCs J1 and P1.

DIGITAL TO ANALOG CONVERSION/DECODING

Parallel digital data from the EDH processor is applied to the digital to analogconverter/encoder, U14. With a component digital input, this devices produces acomposite analog (NTSC/PAL) output. Reset generator U12 provides a reliable power-

9

PDP-886 TECHNICAL DESCRIPTION (CON'T)

up reset to this device. Diode D2 provides a stable reference voltage to the D-to-Aconverter. Potentiometer RV2 serves as the output video level adjustment.

The newly converted analog signal is applied to the filter network L1/L2 and C32 thruC35. This analog Closed Captioned video signal is buffered by amplifier U11A andappears at BNCs J5 and J6. The buffered signal feeds two other circuits as well: inverting amplifier U11B and the Closed Caption Decoder/Data Recovery ICs U16 andU19, respectively. The inverted analog Closed Caption video signal is used by theoutput amplifier/keyer built around U17. This phase-linear keyer inserts decodedcaptions (from the decoder IC) into the video signal. The key signal and captionluminance both originate in U16.

INTERFACE AND CONTROL

The dual micro-controllers, U2 and U3, are the heart of the PDP-886. Each have theirown RS-232/RS-422 data ports, their own (optional) modem, and their own 32k x 8SRAM. The micro-controllers serve the following functions:

1. Dual Universal Asynchronous Receiver/Transmitters (UARTs): handle serial Closed Caption data (RS-232/RS-422) from the caption computer(s). The actual data signal interface is determined by the internal slide switches, SW1 and SW2. Integrated circuit U1 converts the incoming data to the CMOS signal levels required by the micro-controllers.

2. Front panel interface: most are handled by U3. It monitors various front panel controls, specifically the "By-Pass" switch (SW4), rotary encoder "Decode" select (SW3), "Test" switch (SW5), and baud rate select switches (SW6). Switch inputs are de-bounced by U20. U3 also controls the LCD panel to report encoder mode, decoder mode, video standard, and baud rate.

3. Memory manager: each micro-controller reads/writes to external SRAM, U27 and U28, using the address latches U15, U16, U17, and U18. Caption data "framing" and "byte-pair doubling" is handled by the micro-controllers as well.

4. Internal device control: controls the CC Decoder IC (U16) and the EDH processor (U7) via two-wire IIC interface bus. Bus enable/disable is handled by U30.

10

PDP-886 TECHNICAL DESCRIPTION (CON'T)

External device addressing (port expansion) is handled by the 3-to-8 decoders U4, U5,U6, and U7.

MODEM

The MoDems, U8 and U9, are completely self-contained; they connect to a telephoneline and provide CMOS level data to the micro-controller. They also support themonitoring functions for Ring Indication (RI), Off-Hook (OH), and Carrier Detect (CD). These indications appear at the front panel LED packs DS1 and DS2.

POWER SUPPLY

The power supply is a universal input (85-264Vac) AC to DC open frame switcher. Itfeatures over-voltage and over-current protection with a built-in EMI filter. The unit israted at 25W, with specific outputs of 5.0Vdc @ 4A, ±12Vdc @ 0.5A/ea.

11

PRODUCT WARRANTYLink Electronics, Inc.

Link Electronics Inc. warrants its product to be free from defective material andworkmanship for a period of TEN-YEARS from date of shipment, including parts andlabor. This warranty excludes the HDE-3000 High Definition Closed Caption Encoder &PCR-8200 Video Disc Recorder, note1. Labor performed at the Link Electronics factoryin Cape Girardeau, Missouri.

This warranty does not extend to products which have been subjected to misuse,neglect, accident, incorrect wiring, alteration, improper installation, or used in violation ofinstructions from Link Electronics. Link Electronics makes no other warranties, expressor implied, of merchantability, fitness for a particular purpose, or otherwise. LinkElectronics liability for any cause, including breach of contract, breach of warranty, ornegligence, with respect to products sold by it, is limited to repair or replacement by LinkElectronics, at its sole discretion.

The product must be shipped to Link Electronics, freight costs prepaid. Repaired orreplaced equipment shall be shipped customer surface freight only, to be paid by LinkElectronics. This warranty is in lieu of all other warranties, expressed or implied, withrespect to the condition or performance of any Link Electronics products, itsmerchantability, or fitness for a particular purpose.

The product warranty will be null and void, if a specific component part should becomeobsolete by the manufacturer. If the component part becomes obsolete and notavailable through distribution, Link Electronics, Inc will not be responsible for repair orreplacement of a Link Electronics manufactured product.

In no event shall Link Electronics be liable for any incidental or consequential damages,including loss of profits.

SERVICE INFORMATION

In the event that the Link Electronics equipment should fail, you should contact theCustomer Service Department and request a Return Authorization (RA) number. At thattime, the details of how the repair should be processed will be discussed.

All inquiries relating to either parts replacement or warranty service should be directedto: LINK ELECTRONICS, INC., 2137 Rust Avenue, Cape Girardeau, Missouri 63703.Attention: Service Department. Phone: (573)334-4433. Fax: (573)334-9255.

This WARRANTY supersedes all previous warranties, whether implied, written orverbal, Date, October 1, 2005.

Note 1: See the Warranty for the HDE-3000 & PCR-8200 for the warranty period of thisproduct.

12

PDP-886 FCC DOCUMENT

Changes in Attestation Procedure for Plugs and Jacks

Link Electronics, Inc., attests that the network interface plugs or jacks used on thisequipment comply with and will continue to comply with the mechanical requirementsspecified in Part 68, Sub-part F, specifically the dimensions, tolerances, and metallicplating requirements. The compliance of these connectors will be assured by purchasespecifications and incoming inspection. Documentation of such specifications and/orinspections will be provided the FCC within 30 days of their request for same.

Type of Service: The PDP-886 is designed to be used on standard device telephonelines. It connects to the telephone line by means of a standard jack called the USOCRJ-11C. Connection to telephone company provided coin service is prohibited. Connection to party lines service is subject to state tariffs.

Telephone Company Procedures: The goal of the telephone company is to provideyou with the best service it can. In order to do this, it may occasionally be necessary forthem to make changes in their equipment, operations, or procedures. If these changesmight affect your service or the operation of your equipment, the telephone companywill give you notice, in writing, to allow you to make any changes necessary to maintainun-interrupted service.

In certain circumstances, it many be necessary for the telephone company to requestinformation from you concerning the equipment which you have connected to yourtelephone line. Upon request of the telephone company, provide the FCC registrationnumber and the ringer equivalence number (REN); both of these items are listed on theequipment label. The sum of all the RENs on your telephone lines should be less thanfive in order to assure proper service from the telephone company. In some cases, asum of five may not be usable on a given line.

If Problems Arise: If any of your telephone equipment is not operating properly, youshould immediately remove it from your telephone line, as it may cause harm to thetelephone network. If the telephone company notes a problem, they may temporarilydiscontinue service. When practical, they will notify you in advance of thisdisconnection. If advance notice is not feasible, you will be notified as soon as possible. When you are notified, you will be given the opportunity to correct the problem andinformed of your right to file a complaint with the FCC. Contact your telephonecompany if you have any questions about your phone line.

In the event repairs are ever needed on the PDP-886, they should be performed byLINK Electronics, Inc., or an authorized representative of LINK Electronics, Inc.

13

PDP-886 MODEM INSTALLATION

The internal modems for the PDP-886 (Link #MODEM-OP-2) can be easily installed inthe field. Simply remove the cover from the PDP-886 and locate the modem sockets onthe mother board (U8 and U9). They are directly adjacent to the telephone RJ-11connectors on the rear panel. Please note the following:

1.) THE MODEMs MUST BE INSTALLED IN THE CORRECT ORIENTATION. Themodems’ input pins are separated from the other pins: a single missing pinserves as a “key.” (See Figure 1 below.)

2.) Federal Communications Commission (FCC) Part 68 approval is transferable. Asticker is provided which should be attached to the rear panel of the PDP-886after modem installation.

3.) A cable tie is provided which should be secured around the modem module(s),particularly if the unit will be subject to mechanical shock or vibration (such aswould be encountered in a remote-production truck).

Modem/Comm Port Priority

Modems and RS-232/422 data ports areassigned the following priorities:

1st Priority–Modem 12nd Priority–Data 1 (RS-232/422)3rd Priority–Modem 24th Priority–Data 2 (RS-232/422)

For example, if a local system is usingData 1 and an outside caption serviceprovider dials into Modem 1, the outside service is automatically given priority.

Note: If a single modem is installed in the PDP-886, it is recommended that it beinstalled into the Modem 2 (U9) position. This is the factory default for a singlemodem option. In this way, the priority may be easily changed in the field by simplyconnecting the RS-232/422 data cable to Data 1 (priority ahead of the modem) or Data2 (priority behind the modem).

14

15

16

PDP-886 SOFTWARE INSTRUCTION SET

Version 1.X

The PDP-886 can execute several instructions received from a personal computer viathe RS-232C link. Each instruction is listed below along with its hexidecimal equivalentand a brief description of its function. The PDP-886 uses the same command protocolas the Link analog and digital Closed Caption Encoders. However, the PDP-886directly produces open captions without generating a Line 21 data waveform.

COMMAND HEX FUNCTION

^A0 01 30 By-Pass: Both fields transparent, front panel By-Pass switch lit. To return from By-Pass mode to the previous operating mode, use the "Return From By-Pass" directive, ^AS. If another operating mode is selected while in By-Pass, the PDP-886 will immediately assume the new mode of operation.

^A1 01 31 Insert Field 1, Field 2 Opaque: Data is encoded on Field 1 while run-in clock and null bits are inserted on Field 2. This mode should not be used if useful information is known or suspected to be present on Field 2.

^A2 01 32 Insert Field 2, Field 1 Opaque: This mode allows encoding on Field 2 while any and all information on Field 1 will be removed. This mode should not be used if useful information is known or suspected to be present at any time on Field 1. This mode will certainly obliterate any Field 1 data.

^A3 01 33 Insert Field 1, Field 2 Transparent: This mode allows information already on Field 2 to pass un-touched while encoding on Field 1.

17

PDP-886 SOFTWARE INSTRUCTION SET (CON'T)

^A4 01 34 Insert Field 2, Field 1 Transparent/Opaque: This mode allows information already on Field 1 to pass un-touched while encoding on Field 2. In keeping with EIA-608, the encoder constantly monitors Field 1 to insure that run-in clock is present. If it is not, the PDP-886 inserts run-in clock and null bytes.

^A5 01 35 Insert Field 2, Field 1 Transparent: Basically the same as ^A4 above except Field 1 is always transparent. The PDP-886 makes no effort to insure that data is present on Field 1.

^A6 01 36 Internally converted to ^A3.

^A7 01 37 Internally converted to ^A0.

^A? 01 3F Vendor and Version Inquiry: This directive is recommended by EIA-608 to facilitate remote captioning (via modem). In response to the "control A, question mark" inquiry, the PDP-886 sends the following message back to the computer operator:

LINK Electronics, Inc. MODEL NUMBER: PDP-886 SOFTWARE VERSION: X.X

^A@ 01 40 Clear data recovery selections

^AA 01 41 Data Recovery, CC1.

^AB 01 42 Data Recovery, CC2.

^AC 01 43 Data Recovery, T1.

^AD 01 44 Data Recovery, T2.

^AE 01 45 Data Recovery, CC3.

^AF 01 46 Data Recovery, CC4.

18

PDP-886 SOFTWARE INSTRUCTION SET (CON'T)

^AG 01 47 Data Recovery, T3.

^AH 01 48 Data Recovery, T4.

^AI 01 49 Data Recovery, XDS.

^AJ 01 4A Data Recovery, all Field 1.

^AK 01 4B Data Recovery, all Field 2.

^AL 01 4C Data Recovery, "Tokenize" Control Codes. Codes are converted to ASCII characters that represent theirhexidecimal values. This directive can be used to modifyany Data Recovery selection.

^AM 01 4D Data Recovery, "No Codes". Control codes are removed, leaving only the textual information. This directive can beused to modify any Data Recovery selection.

^ANx 01 4E Enter Newswire Mode: This mode accepts a simple ASCII feed via RS-232 and the encoder itself inserts the command codes for three-line roll-up captions. A "time-out" feature will insert the "erase displayed memory" command code after"x" seconds without new RS-232 input. ("x" may be anynumber from three through fifteen. For numbers greater than nine, use hexidecimal letters A through F. Default time is fifteen seconds.) To exit Newswire mode, you must reset the PDP-886 by ^AR. For two-line roll-up captions, a lower-case "n" (hexidecimal value = 6E) may be used.

^AP 01 50 Disable Odd Parity: Stores the incoming data without

adding the "odd parity" bit typical of Closed Caption data. Useful for data transmission unrelated to Closed Captioning.

19

PDP-886 SOFTWARE INSTRUCTION SET (CON'T)

^AQ 01 51 Disable Byte-Pair Doubling of Command Codes: While Closed Caption command codes are typically transmitted twice in successive video frames, this directive will cause them to be transmitted only once. Useful for data transmission unrelated to Closed Captioning, or to possibly allow compatibility with Captioning software which could double the command codes before transmission to the encoder via RS-232.

^AR 01 52 Reset: Returns the PDP-886 to its power-up default condition, both fields transparent.

^AS 01 53 Return From By-Pass: Returns the PDE-890 to the last operating condition before By-Pass (^A0) was selected.

^AT 01 54 Run Test Message and Reset: A test message (identical to the ^A? response) is encoded into the CC1 and CC3 datachannels. Unit returns to power-up default condition when test message is complete.

^AVx 01 56 "V-chip" mode: ^AV1 enters V-chip mode. This modeaccepts a simple ASCII string via RS-232 and inserts thisdata into the XDS data channel. Input string must befollowed by a carriage return. ^AV0 exits V-chip mode byplacing the unit in By-Pass mode.

20

21

22

INSERTING YOUR TSID USINGTHE PDR-885 and PDP-886

The PDR-885 and PDP-886 can be used to insert you TSID number that hasbeen assigned to your station. You must have the latest microprocessorfirmware to do this, which can be purchased from Link Electronics.

The PDR-885 and PDP-886 allow for encoding of XDS packets, where the TSIDresides, onto field 2 of the video stream. The PDR-885 and PDP-886 block incomingXDS information if they are being used to encode XDS information. If wanting to retainthe current XDS information that is already encoded on the incoming video, and just addyour TSID number you will have to do one of the following:

1. Manually re-insert all of the XDS packets along with your TSID numberusing a terminal program, such as HyperTerminal.

2. Use third party software, which is compatible with Link encoders, thatallows you to encode all of the XDS packets along with your TSID number. The XDS information that currently encoded on the video will have to bere-entered using the software.

3. If your third party software will encode the XDS packets you need, but notthe TSID number, you can do the following. Use the software to encodethe XDS packets you want, then use a terminal program, such asHyperTerminal, to enter your TSID number.

HOW TO USE A TERMINAL PROGRAM TO ENTER YOUR TSID NUMBERThe standard protocol for communications with the Link encoder is as follows:BAUD RATE DATA BITS PARITY STOP BITS FLOW CONTROL1200 to 9600 8 NONE 1 NONE

The encoder must be setup to encode XDS information; this is accomplishedwith the following commands:CTRL-AV1Now the encoder is ready to accept XDS control codes specified by EIA/CEA-608-B. To enter your TSID number use the following commands:CTRL-ECTRL-DFOUR CHARACTERS (TSID NUMBER)see explanation on how to generateCTRL-OENTERThe PDR-885 and PDP-886 will now be encoding your TSID number along withany other XDS information you have provided by the serial port.

HOW TO GENERATE FOUR CHARACTER CODE FOR TSID NUMBER

Your TSID number is a 16bit value that has been assigned to you as a decimal orhexadecimal number. In order to encode the TSID it will have to be converted to fourASCII characters. This can be accomplished by doing the following:

23

1. Using Windows Calculator in scientific mode convert your decimal numberto a hexadecimal number. (If starting with a hexadecimal number skip tostep 2)

2. The hex number must be four digits, if it is not, leading zeros must beadded to make it a four digit number.

3. Treat your four digit hexadecimal number as four independent characters. Using the chart below convert each hexadecimal character to its TSIDcode character.

HEXADECIMAL CHARACTER TSID CODE CHARACTER0 @1 A2 B3 C4 D5 E6 F7 G8 H9 IA JB KC LD ME NF O

Examples:TSID NUMBER = 2(decimal)TSID NUMBER = 0x0002(hex with leading zeros)TSID FOUR CHARACTER CODE = @@@B (these are the four characters thatwould be enter when encoding your TSID number from a terminal program)

TSID NUMBER = 1616(decimal)TSID NUMBER = 0x0650(hex with leading zeros)TSID FOUR CHARACTER CODE = @FE@ (these are the four characters thatwould be enter when encoding your TSID number from a terminal program)

TSID NUMBER = 22659(decimal)TSID NUMBER = 0x5883(hex no leading zeros)TSID FOUR CHARACTER CODE = EHHC (these are the four characters thatwould be enter when encoding your TSID number from a terminal program)