evertz S623 User manual

MODELS S623, S623-VIR, S623-EDL
TIME CODE READER with SERIAL I/O
INSTRUCTION MANUAL
© Copyright 1988, 1991, 1993
EVERTZ MICROSYSTEMS LTD.
3465 Mainway, Burlington, Ontario, Canada, L7M 1A9
Phone: [phone] Fax: [phone]
BBS: 905-335-9131
Internet: Tech Support: [email protected]
Sales: [email protected]
Web Page: http://www.evertz.com
Revision 1.1.1, April 1993
The material contained in this manual consists of information that is the property of Evertz
Microsystems and is intended solely for the use of purchasers of Evertz time code equipment. Evertz
Microsystems expressly prohibits the use of this manual for any purpose other than the operation or
maintenance of the equipment.
All rights reserved. No part of this publication may be reproduced without the express written
permission of Evertz Microsystems Ltd. Copies of this guide can be ordered from your Evertz products
dealer or from Evertz Microsystems.

INFORMATION TO USERS IN EUROPE
NOTE
CISPR 22 CLASS A DIGITAL DEVICE OR PERIPHERAL
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to the European Union EMC directive. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual, may cause harmful interference
to radio communications. Operation of this equipment in a residential area is likely to cause
harmful interference in which case the user will be required to correct the interference at his own
expense.
INFORMATION TO USERS IN THE U.S.A.
NOTE
FCC CLASS A DIGITAL DEVICE OR PERIPHERAL
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his own expense.
WARNING
Changes or Modifications not expressly approved by Evertz Microsystems Ltd. could
void the user’s authority to operate the equipment.
Use of unshielded plugs or cables may cause radiation interference. Properly shielded interface
cables with the shield connected to the chassis ground of the device must be used.

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REVISION HISTORY
REVISION DESCRIPTION DATE
1.0 Original issue - preliminary release 7/88
1.0.1 Manual Change Sheet S623-1 6/89
1.1 Reformatted, schematic up-dates 1/91
1.1.1 Schematic revisions as follows: 4/93
OLD DWG. NEW DWG.
611-80K 6110-80L
6110-30K 6110-30L
ADDITION
6111-80F Component Layout

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TABLE OF CONTENTS
1. INTRODUCTION ...............................................................................................................................1-1
2. INSTALLATION ................................................................................................................................2-1
2.1. LTC INPUT AND OUTPUT ......................................................................................................2-1
2.2. READER VIDEO INPUT...........................................................................................................2-1
2.3. SERIAL REMOTE CONTROL..................................................................................................2-1
3. OPERATION .....................................................................................................................................3-1
3.1. LTC/VITC SELECTION ............................................................................................................3-1
4. SERIAL PORT OPERATION ............................................................................................................4-1
4.1. COMMUNICATION PROTOCOL .............................................................................................4-1
4.2. CONTINUOUS BROADCAST MODE ......................................................................................4-1
4.3. MESSAGE FORMAT ...............................................................................................................4-2
4.4. DATA FORMATS .....................................................................................................................4-4
4.4.1. BCD Time Data...................................................................................................................4-4
4.4.2. Status Flags........................................................................................................................4-4
4.4.3. User Bit Data ......................................................................................................................4-6
4.4.4. Binary Time Data ................................................................................................................4-6
4.5. COMMANDS ............................................................................................................................4-6
5. EDIT DECISION LIST .......................................................................................................................5-1
5.1. OVERVIEW ..............................................................................................................................5-1
5.2. TWO EDIT DECISION LIST FORMATS ..................................................................................5-2
5.3. EDITOR FORMAT....................................................................................................................5-2
5.4. USER BIT ENCODING IN EDITOR FORMAT .........................................................................5-3
5.4.1. Reel # (Rrr) .........................................................................................................................5-3
5.4.2. Edit Type And Mode (EE) ...................................................................................................5-3
5.4.3. Edit Duration (DDD)............................................................................................................5-4
5.5. EXAMPLE OF USER BIT ENCODING ....................................................................................5-6
5.6. SELECTING VITC LINES FOR THE EDL................................................................................5-6
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5.7. EVERTZ FORMAT ...................................................................................................................5-7
6. TECHNICAL DESCRIPTION ............................................................................................................6-1
6.1. MICROCONTROLLER (6110-30) ............................................................................................6-1
6.2. HIGH SPEED LTC READER (6110-30)...................................................................................6-1
6.3. VIDEO PROCESSING (6110-30) .............................................................................................6-2
6.4. HIGH SPEED VITC READER (6111-30)..................................................................................6-2
6.5. CHANGING THE POWER UP DEFAULTS .............................................................................6-3
7. 4600T INSTALLATION .....................................................................................................................7-1
7.1. REAR PANEL ..........................................................................................................................7-1
7.2. INSIDE THE 4600T:REMOVING THE FRONT PANEL ...........................................................7-1
7.3. MOUNTING ..............................................................................................................................7-2
Figures
Figure 1-1: Model S623 Block Diagram................................................................................................... 1-2
Figure 4-1: Serial Protocol State Diagram ............................................................................................... 4-1
Figure 5-1: Editor Format Output............................................................................................................. 5-3
Figure 5-2: Edit Modes & Types .............................................................................................................. 5-5
Figure 5-3: Evertz Format EDL Output .................................................................................................... 5-7
Drawings Drawing #
6031/6051 Rear Panels.............................................................................................................M6000-58RL
611/623 Main Schematic................................................................................................................ 6110-30L
6110 Component Layout ................................................................................................................ 6110-80L
611/623 VITC Reader Submodule .................................................................................................6111-30F
6111 Component Layout ................................................................................................................6111-80F
605/6051 I/O Modules ....................................................................................................................6050-30E
6050 Component Layout ................................................................................................................6050-80B
6051 I/O Power Supply ..................................................................................................................6051-31A
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1. INTRODUCTION
This microcontroller (MCU) based module contains a full speed (1/30 to 70
times play) longitudinal time code (LTC) reader and LTC translator/phase
restorer. Installing the optional plug-in VITC submodule gives the reader
tremendous additional capabilities. It can now read VITC at speeds from
still frame to in excess of 40 times play speed. The front panel mode
switch allows the LTC/VITC reader pair to operate in either an LTC or VITC
only mode or in an automatic switchover mode. The powerful MCU
firmware automatically selects valid code from either source and provides
accurate time code reading from still frame to 70 times play speed.
A fully decoded and regenerated play speed LTC output is provided, using
whatever source is currently being read (indicated by the LTC and VITC
LED’s). In many VTR’s the tie code head position with respect to the video
signal can vary quite considerably from machine to machine causing a
code phase shift relative to the video frame. When the incoming code is at
normal play speed, the output code is properly synchronized to the video,
thus compensating for any LTC code misalignments from the video, and
providing an LTC translation of the incoming VITC.
The recovery of recorded LTC time code at other than play speed has
always presented some degree of difficulty, particularly with low end 3/4”
recorders lacking a separate address track. The high speed reader in the
S623 employs sophisticated input conditioning and clock/data separator
circuits to reliably recover LTC over the full shuttle and wind speed range of
most VTR’s.
The VITC reader sub-module contains a full wind speed (still to over 45
times play speed) VITC reader, designed for use with non time base
corrected video signals. Although the use of time base correctors will
enhance the recovery range of the VITC reader, the amount of
improvement is dependant on the type of TBC and transport being used.
The module contains all the necessary video processing circuits and
therefore, requires no external signals other than the video signal itself.
Recovered VITC data is transferred to the companion LTC reader module
for validation and further processing. If the VITC reader is selected, the
data will then be presented to the LTC translator output.
A serial data port provides time code data for interface to an editor or other
computer device. Both RS-232-C and RS-422 levels are supported.
Reader data may be sent continuously, or on request only. In addition, the
computer can set up various operation modes.
The S623 reader module is available in three versions:
1. Model S623: LTC Reader
2. Model S623-VIR: LTC/VITC Reader
3. Model S623-EDL: LTC/VITC Reader with Edit Decision List
Output
INTRODUCTION Page 1-1

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All versions of the S623 are equipped with a regenerated LTC output from
the incoming code, and a serial I/O port for connection to a computer or
printer.
Figure 1-1: Model S623 Block Diagram
INTRODUCTION Page 1-2

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2. INSTALLATION
Each S623 module is housed in a compact enclosure suitable for table or
shelf mounting. An external 12 VDC (300 mA) power adapter must be
connected to provide power to the S623 reader. All the necessary
connectors are on the rear panel.
2.1. LTC INPUT AND OUTPUT
A ¼” stereo phone jack is provided as an input to the LTC reader. When
using an unbalanced input to the reader, the signal should be applied to
the tip of the phone plug. Normally, the unused input (ring) should be
connected to ground (sleeve).
A ¼” stereo phone jack is provided as an output from the LTC translator.
This output is play speed regenerated code from whichever code source is
being read (indicated by the LTC and VITC indicators). When the incoming
code is at normal play speed, the output code is properly synchronized to
the input video, thus compensating for LTC code misalignment from the
video, or providing an LTC translation of incoming VITC.
2.2. READER VIDEO INPUT
Video associated with the LTC code or video with VITC recorded on it is
connected to the VIDEO IN loop. The internal sync separator has a high
impedance input tapped off the loop through, therefore, the input must be
terminated with 75 ohms at the end of the line.
"
When using the LTC translator output, video must be connected as a
reference for phasing the output code. The VITC LED will flash on
momentarily every four seconds when no video is connected.
2.3. SERIAL REMOTE CONTROL
A nine pin subminiature “D” connector is provided for remote control of the
reader functions and data output. This serial port provides both RS-232-C
and RS-422 levels as shown below:
INSTALLATION Page 2-1

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Pin Name Description
5 TX RS-232 Transmit
9 FG Frame Ground
4 RC Receive Common
8 RA Receive “A” & RS-232
3 RB Receive “B”
7 TB Transmit “B”
2 TA Transmit “A”
6 TC Transmit Common
1 FG Frame Ground
When pin 8 is connected to an RS-232-C level signal, pin 3 should be
connected to ground (pin 4)
The default data format used is 9600 Baud, 8 data bits, even parity, one
stop bit. The baud rate and data format may be customized by changing
the EPROM. (See section 6.5 for more information about changing default
values.)
INSTALLATION Page 2-2

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3. OPERATION
3.1. LTC/VITC SELECTION
A three position toggle switch mounted on the front panel
(LTC/AUTO/VITC) selects the reader operating mode. The user may
select either an LTC or VITC only mode or the AUTO switch-over mode.
The automatic mode allows the microcontroller to dynamically switch to the
other reader if the transport speed exceeds the recovery range of the
currently selected reader. The recovery range of the reader is limited by
the tape machine electronics and tape handling capabilities. If there is no
video signal connected to the module this switch is ignored and the switch-
over defaults to the LTC reader.
Two front panel LED’s (LTC, VITC) indicate which reader is currently
selected. These LED’s will be illuminated only when the following two
conditions are met.
1. The particular reader is selected by the microcontroller in either a
manual or automatic mode.
2. The reader is continually receiving valid time code.
If the reader is not selected or if it has not received a valid time code data
within the last 50 milliseconds, its LED will be extinguished. At very slow
transport speeds (1/5 play speed and below) this will cause the LTC
indicator to continually flash on and off. This is normal and is not indicative
of a reader error
OPERATION 3-1

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OPERATION Page 3-2

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4. SERIAL PORT OPERATION
4.1. COMMUNICATION PROTOCOL
The communications protocol is described in the state diagram below.
There are two states in the protocol. The continuous broadcast state
sends time and user bit data once per frame. The select state awaits
commands and issues appropriate responses to the commands. These
two states are described more fully below.
R(STX)
SELECT
R (MESSAGE)
ERROR (Parity,checksum
undefined command, etc)
TIMEOUT
(10 msec)
T(NAK)
T(STX)
T (MESSAGE)
T(ACK)
R (UNDEFINED)
POWER UP
T(ACK)
R(ESC)
BROADCAST
no response required
R(STX) R (MESSAGE)
ERROR
TIMEOUT
(10 msec)
T(NAK)
Figure 4-1: Serial Protocol State Diagram
4.2. CONTINUOUS BROADCAST MODE
The S623 reader immediately enters the continuous broadcast state upon
power-up. In this mode, the S623 reader sends a response message once
SERIAL PORT OPERATION 4-1

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per frame in the same format as the READ BCD TIME/USER BITS
command below.
The S623 reader remains in the continuous broadcast mode unless
directed by a valid command to the SELECT state by issuing a command.
When the command is executed, the reader will return to the SELECT
state.
To re-enter the continuous broadcast mode, send an ESC (03 hex)
character. The S623 responds with an ACK (04 hex) character and enters
the broadcast mode.
For example, if the current LTC reader time code was 12:45:30:00 and the
user bits were all zero, the response message would be received as
follows:
STX 02
BYTE COUNT 0B
COMMAND 0B
MESSAGE:
FRAMES 00
SECONDS 30
MINUTES 45
HOURS 12
USER BITS 1 00
USER BITS 2 00
USER BITS 3 00
USER BITS 4 00
STATUS 1 00
STATUS 2 40
CHECKSUM 23
4.3. MESSAGE FORMAT
The S623 reader responds to several commands requesting time/user bit
data in several formats and controlling its operating mode.
Each control message starts with the STX character and ends with a
checksum. The purpose of the checksum is to verify that all the bytes in
the message that contain variable data have been received properly. The
STX is the only byte that has a fixed value, so it is the only byte not
included in the checksum calculation. The checksum is calculated by
adding all the variable bytes together. The least significant byte of this sum
is then subtracted from 100 hex to compute the checksum. To verify that
the checksum is computed correctly, add all the bytes including the
checksum but excluding the STX together. The least significant byte of the
sum should be zero if the checksum is computed correctly.
Command messages are structured as follows:
STX start of message character (02 hex)
SERIAL PORT OPERATION 4-2

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BYTE COUNT number of bytes in command message not including the
STX, BYTE COUNT or CHECKSUM
MESSAGE variable length command message, maximum 2 bytes
CHECKSUM the two’s complement of the one byte sum of the
MESSAGE and the BYTE COUNT.
The MESSAGE consists of a command and one optional argument byte
which provides specific data required by the command. It is structured as
follows:
COMMAND single byte command as outlined below
ARGUMENT single byte of data only if required by COMMAND
If the command message was not accepted by the S623 reader due to a
checksum error, parity error or an invalid command, the S623 reader will
respond with a NAK (05 hex) character and re-enter the SELECT state.
If the command message is accepted by the S623 reader it will respond
with an ACK (04 hex) character and re-enter the SELECT state to await a
further command.
If the command message requires data, the S623 reader will transmit a
response message structured as follows:
STX start of message character (02 hex)
BYTE COUNTnumber of bytes in response message not including the
STX, BYTE COUNT or CHECKSUM
COMMAND single byte corresponding to the command which requested
the data
MESSAGE maximum 10 bytes, data requested by the command
CHECKSUM the two’s complement of the one byte sum of the
COMMAND, MESSAGE and the BYTE COUNT
For example, to request the current time code data in BCD format the
command message would be transmitted as follows:
STX 02
BYTE COUNT 01
MESSAGE
COMMAND 0A
CHECKSUM F5
If the current LTC reader time code was 12:45:30:00, the response
message would be received as follows:
STX 02
BYTE COUNT 07
COMMAND 0A
MESSAGE
FRAMES 00
SECONDS 30
SERIAL PORT OPERATION 4-3

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MINUTES 45
HOURS 12
STATUS 1 00
STATUS 2 40
CHECKSUM 28
4.4. DATA FORMATS
4.4.1. BCD Time Data
BCD time data is transmitted as four packed BCD bytes with the frames
byte transmitted first. The time code status flag bits (i.e.: drop frame,
colour frame etc.) are extracted before transmission but are available in the
STATUS flags data.
FRAMES SECONDS MINUTES HOURS
1X 10X 1X 10X 1X 10X 1X 10X
4.4.2. Status Flags
The status flags are transmitted as two bit-mapped bytes. They contain the
code status flags from the time code data as well as other status
information.
STATUS 1 STATUS 2
bits 0-7 bits 0-7
Status Flags 1
bit 0 STOP - Indicates time code is not running
bit 1 PLAY - Indicates time code is at play speed
bit 2 DIR - Indicates time numbers are decreasing when 1, increasing
when 0
bit 3 FFWD - Indicates transport in fast forward mode
bit 4 REW - Indicates transport in rewind mode
bit 5 not used, always 0
bit 6 not used, always 0
bit 7 not used, always 0
Status Flags 2
bit 0 DROP FRAME - Indicates time code is in drop frame format
bit 1 COLOUR FRAME FLAG - Indicates time code is colour framed
bit 2 PAL units: Binary Group Flag 1
NTSC units: Bi-phase parity flag (LTC)
Field Mark Flag (VITC)
bit 3 PAL units: Binary Group Flag 2
NTSC units: Binary Group Flag 1
bit 4 PAL units: Bi-phase parity flag (LTC)
SERIAL PORT OPERATION 4-4

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Field Mark Flag (VITC)
NTSC units: Not used at this time
bit 5 PAL units: Not used at this time
NTSC units: Binary Group Flag 2
bit 6 LTC FLAG - Indicates longitudinal time code being read
bit 7 VITC FLAG - Indicates vertical interval time code being read
The Binary group flag bits are defined as follows:
Bin Grp Bin Grp
Flg 1 Flg 2
Character set unspecified 0 0
Eight bit Alpha-numeric 1 0
Character set
Unassigned 0 1
Unassigned 1 1
SERIAL PORT OPERATION 4-5

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4.4.3. User Bit Data
User bit data is transmitted as four bytes with two user bit groups packed
into each byte. The first user bit group is transmitted first.
UB1 UB2 UB3 UB4
1X 10X 1X 10X 1X 10X 1X 10X
4.4.4. Binary Time Data
Binary time data is transmitted as a 24 bit (3 byte) unsigned binary number
of frames with the least significant byte transmitted first.
Binary time data is the absolute number of frames after 00:00:00:00. In
NTSC systems, if the time code number was originally in DROP FRAME
format the binary time data will have the number of dropped frame
numbers subtracted from it.
bits 0-7 bits 8-15 bits 16-23
4.5. COMMANDS
Following is a list of the commands understood by the S623 reader. If
invalid commands are sent to the S623, it will respond with a NAK (05 hex)
character.
08 READ BINARY TIME DATA Returns the current time code data in binary format and the
status flags
09 READ BINARY TIME/USER BIT DATA
Returns the current time code data in binary format, the user
bit data and the status flags
0A READ BCD TIME DATA Returns the current time code data in BCD format and the
status flags
0B READ BCD TIME/USER BIT DATA Returns the current time code data in BCD format, the user
bit data and the status flags
0C READ USER BIT DATA Returns the user bit data and the status flags
0D READ STATUS FLAGS Returns the status flags
10 READ OPERATING MODE Returns one byte containing the current operating mode
flags of the time code reader as below:
SERIAL PORT OPERATION 4-6

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S623 OPERATING MODE FLAGS
bit 0 LTC Reader Enable
bit 1 VITC Reader Enable
bit 2 Local Lockout Enable
bit 3 EDL Output Format (EDL Option)
0=Editor Format
1=Evertz Format
bits 4-7 not used, set to 0
11 READ LINE NUMBER Returns one byte containing the current line number which
the VITC Enable is being activated. (See ‘Set Line Number’
command below). (Not implemented on all versions)
14 SET OPERATING MODE Presets the operating mode of the reader. Expects one byte
of operating mode flags. (See command 10 for details of
operating mode flags).
15 SET LINE NUMBER Sets the VITC Read Enable to the according line number.
Expects one byte containing the line number code as
follows:
ENTER CODE FIRST LINE FIRST LINE
(PAL) (NTSC)
00 06 10
01 07 10
02 08 10
03 09 10
04 10 10
05 11 11
06 12 12
07 13 13
08 14 14
09 15 15
0A 16 16
0B 17 17
0C 18 18
0D 19 19
0E 20 20
0F 21 20
10 1 5
18 ENABLE LTC READER
19 DISABLE LTC READER
Enables or disables the LTC reader
1A ENABLE VITC READER
1B DISABLE VITC READER
SERIAL PORT OPERATION Page 4-7

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Enables or disables the VITC reader
Enabling both the LTC and VITC time code readers enables the AUTO mode where time code will be
decoded from which ever source is valid.
1C ENABLE LOCAL LOCKOUT Disable front panel reader mode selection switch
1D DISABLE LOCAL LOCKOUT Enable front panel reader mode selection switch
Local lockout is enabled automatically by issuing the enable/disable reader
mode commands
"
1E ENABLE EVERTZ FORMAT Model S623 & 623-VIR: In Broadcast Mode outputs the
current time code data in BCD format, the user bit data and
the status flags
Model S623-EDL: Selects Evertz edit decision list output
format
1F DISABLE EVERTZ FORMAT Model S623 & 623-VIR: In Broadcast Mode outputs the
current time code data, the user bit data and the status flags
as ASCII characters.
Model S623-EDL: Selects editor edit decision list output
format
"An ESC (03 Hex) character is required to return the module to Broadcast
mode after a switch of formats has been performed.
SERIAL PORT OPERATION Page 4-8