BEL 6110 Operating manual

Operator’s &
Service manual
Model 6110
Digital audio lay-off
recorder
Version 1.0
BEL (Digital Audio) Ltd.
Invicta Works Elliott Road Bromley Kent BR2 9NT UK
Tel: [phone] Fax: [phone]
Email: [email protected]
Web: www.bel-digital.com

BEL 6110 Lay-off Recorder
V1.0
The Version 1.0 BEL 6110 is a CE marked programmable version of the popular
BDE-6000S. It provides for more comprehensive control via an RS422 serial link and allows
various operating parameters to be adjusted. These settings are retained on power down.
This version has further enhancements to the AES digital audio synchronisation facilities
enabling the digital output to be referenced to AES, video or word clock sources.

Contents
DESCRIPTION 5
OPERATION AND FRONT PANEL CONTROLS 5
Input Sensitivity 5
Record Switch 5
Record switch in Serial Mode 6
Play Switch 6
Play Switch in Serial Mode 6
^, Set and Page Keys 6
Serial Control 9
a) JOG, SHUTTLE and DMC 9
b) Cue-up with DATA and Pre-roll 9
c) Transport commands 9
Striping 9
LCD Display 10
DIGITAL AUDIO INPUT-OUTPUT 11
Digital Referencing 11
POWER-UP 11
CONNECTIONS 12
EMC COMPLIANCE 12
REMOTE CONTROL CONNECTOR 13
MEMORY ADDITION 14
POWER ON RESET 14
SPECIFICATION 15
6110 RS422 IMPLEMENTATION LIST 16
DETAIL OF SWITCHES ON FRONT - FIGURE 2 17
DETAIL OF DEFAULT LCD - FIGURE 3 17
REAR PANEL VIEW - FIGURE 4 17
FRONT PANEL LAYOUT 18
3

REAR PANEL LAYOUT 19
BLOCK DIAGRAM 20
TROUBLESHOOTING 21
APPLICATION NOTES 22
Introduction 23
Typical Applications 24
SERVICING INFORMATION CONTENTS 26
4

5
BEL 6110
Digital Audio Lay-off Recorder
DESCRIPTION
The BEL 6110 is a device that will store audio and time code information in a digital
form. This information can then be replayed synchronised to an incoming time code. The
basic unit contains an 8 Mbyte circular memory which can record up to 42 seconds of
stereo audio. This memory can be increased, to a maximum of 32 Mbyte, providing
recording times of 84 secs and 168 secs respectively. The description below refers to the
8 Mbyte version but it also applies to all versions that differ only in recording times.
The BEL 6110 will initially fill its memory in a linear way and provide a warning on an
LED when the recording is within 5 Seconds of the end of this memory. If recording is
allowed to exceed the memory capacity the unit will enter a circular mode where only the
most recent 42 Seconds of audio is retained. In the follow mode, recording is only allowed
in the presence of a valid time code. When the same time code is subsequently applied to
the unit the audio is replayed in synchronism. The operation of the unit can be controlled
by two push switches. The status of the BEL 6110 is displayed on LED indicators and a
liquid crystal display (LCD). These controls and indicators are duplicated on a remote
control unit. Serial control (RS422) is programmable from the set-up menu.
OPERATION AND FRONT PANEL CONTROLS
There are six front panel controls. From left to right, these are:-
INPUT SENSITIVITY
This control permits the amplitude of the signal entering the unit to be adjusted. For
unity gain, set this control to the centre position. For other settings, with audio and running
time-code present, press the Record switch and adjust the control to provide the desired
level. The Peak Program indicators to the left of this control give a visual indication of
optimum settings. For normal operation, the yellow LED indicators should be on constantly,
with the green LED indicators flashing on peaks.
RECORD SWITCH
Providing there is time-code present, pressing ÒRecordÓ starts recording new audio
with its corresponding time-code. A second press of ÒRecordÓ returns the unit to Follow
mode as does pressing ÒPlayÓ, or interrupting the time-code for example, by stopping or
searching the edit VT. The red LED above the Record switch indicates ÒRecordÓ mode:this
indicator will flash 5 seconds before the memory is full. The amber LED indicators to the
left and right of the record switch indicate the position of the stored audio relative to the
incoming time-code. When the in-coming time-code is ÒbeforeÓ the stored audio, the left
LED will light, when it is locked both LEDs will light and when it is ÒafterÓ only the right LED
will be lit.

RECORD SWITCH IN SERIAL MODE
Depressing the Record switch while in serial mode will start the BEL 6110 recording
at the displayed time code. A second press will stop the recording. This enables the BEL
6110 to record while attached to a play-only editor port. This facility enables editing
equipment with limited numbers of record ports to be used more effectively.
PLAY SWITCH
Pressing ÒPlayÓ retrieves the stored audio from the start of the most recent recording.
Whilst in ÒPlayÓ mode, incoming time-code is ignored. A second press of ÒPlayÓ returns the
unit to the Follow mode.
PLAY SWITCH IN SERIAL MODE
Pressing ÒPlayÓ whilst in serial mode retrieves the stored audio information starting
at the displayed time. Pressing a second time will stop this process.
^, SET AND PAGE KEYS
Refer to the diagrams 1 and 2 for the details of operation.
Basically:-
The ÒSetÓ key selects the different modes to be changed
The ^ key is used to make a change
The ÒPageÓ key is used to access programmable features within a Set mode.
6

DIAGRAM 1. SET-UP MENUS
7

DIAGRAM 2. SET-UP MENUS
8

SERIAL CONTROL
The BEL 6110 can be controlled by the editing equipment, be sending commands
down a serial communication line. The serial communication protocol must conform to the
RS422 standard as implemented by SONY©. The BEL 6110 memory will appear to the
user exactly like a section of tape which has been pre-striped. The stripe can be set to start
on the hour from 0 to 23 hrs, and the length of recording which can be accommodated will
depend on the size of the installed memory (42, 84, or 168 seconds for stereo). The
ÒWindowÓ provided by the BEL 6110 memory can be recorded and replayed in the same
way as magnetic tape. If recording is attempted outside this window, then no recording will
take place, and no record flags will be returned by the equipment.
The serial mode is selected from the Set-Up menu. The SONY©protocols shown in
Section 7 are accepted by the BEL 6110. The unit will identify itself as a BVW 75 recorder.
This particular tape recorder system was selected because it responds to a set of
commands similar to those supported by the BEL 6110. However, the BEL 6110 does not
exactly mimic this tape recorder. In particular, the BEL 6110 is a purely electronic device,
as such it is not subject to the inertial effects invariably present in any mechanical tape
recorder. To the user, the response of the BEL 6110 appears to be instant. The main
differences in operation can be summarised as follows:-
a) Jog, Shuttle and DMC
Each time a request to move one frame in either direction is detected, the BEL 6110
will respond by playing a 0.1 second burst of audio in the forward directional normal speed.
This facility eases the precise location of any required sound.
b) Cue-up with DATA and PRE-ROLL
These macro commands operate considerably faster on the BEL 6110 than is
possible on any tape based system. The cue point (or pre-roll point) is found in a maximum
of 60 microseconds from receipt of the relevant command.
c) Transport commands
Commands such as Stop, Rewind, Fast Forward, etc., become effective immediately
they are received. No delay will be apparent, since there is no mechanical inertia in the
system.
STRIPING
The memory in the BEL 6110 is striped when any roll mode is selected. (The stripe
setting is in one hour increments from 0 to 23 Hrs.) Any audio information stored in the
memory at this time is preserved, but the associated time code is over-written.
9

LCD DISPLAY
This is a Supatwist LCD display with LED backlighting. It is a multi-function display,
showing the set-up modes and the current status of the unit:-
Record Unit in record mode, recording audio and time-code (follow-mode)
Stop No readable code
Play Unlocked replay of audio
Locked
=
ÜReading time-code before stored audio
ÝReading time-code after stored audio
5 5 seconds before the audio store is full
10
Unit locked to time-code in replay
}

DIGITAL AUDIO INPUT-OUTPUT
The digital interface is AES/EBU compatible at a sampling rate of 48kHz. A sample
rate converter is used on the input allowing the conversion of 32kHz, 44.1kHz digital
sources to 48kHz. The digital REF AES input can be used with sampling rates other than
48kHz but the unit is optimised for 48kHz.
The digital output is always operating concurrently with the analog output. The
source, however, is
either analog or digital.
DIGITAL REFERENCING:-
1) Audio in - The BEL 6110 locks to incoming AES signal connected to the AES
digital input.
2) AES - The BEL 6110 locks to the external AES signal connected to the AES
REF digital input. (48kHz)
3) Word - The BEL 6110 locks to the external word signal connected to the word
input. (48kHz) (TTL levels)
4) Video - The BEL 6110 locks to the external video signal PAL or NTSC (auto
select) connected to the video input. (1V Pk/Pk)
5) Internal - The BEL 6110 locks to the internal crystal oscillation. (48kHz
±25ppm)
POWER-UP
On power-up, the LCD will show the Model Number, The Version Number and the
maximum audio memory fitted (either 8, 16 or 32 Mbyte). This display remains for a few
seconds, before resetting to the STOP mode. (A slight flickering of the display is normal
during this time, as the memory is being purged of random data.) The time taken to reset
is dependent on the memory fitted (i.e. longer for the 32 Mbyte version.)
11

CONNECTIONS
The rear panel has twelve connectors, a voltage selector and a combined IEC power
inlet switch and fuseholder. From left to right these are:-
Switch, Fuse, IEC 3 pin power inlet (combined EMI filter unit)
Mains power voltage selector (115V / 230V)
RS422 Serial Port 9-pin female miniature D-type (lockable)
Remote Control 9-pin female miniature D-type (lockable)
Time-Code Input 3-pin XLR type connector (female) for SMPTE input Balanced
Digital Ref: Word 50½ BNC (4k7½)
Digital Ref: Video 75½ BNC medium impedance (75½ termination link internal)
Digital Output (AES/EBU) male XLR 3-pin (110½)
Digital Input (AES/EBU) female XLR 3-pin (110½)
Digital Ref: AES (48kHz) female XLR 3-pin (110½)
Left and Right Audio Outputs 3-pin XLR type connector (male). Balanced Pin 2 hot.
Left and Right Audio Inputs 3-pin XLR type connectors (female). Balanced Pin 2 hot.
EMC COMPLIANCE
The BEL 6110 was designed and tested to comply with the EMC directive numbers
EN55103, EN55022, EN55082-1 and EN60950 when used as directed.
This unit must be used with an earthed mains lead to comply with the CE low voltage
directive.
CE
12

REMOTE CONTROL CONNECTOR
The pin assignment on the 9-pin miniature D-type connector is as follows:-
Pin Function
1 Record Switch
2 Play Switch
3 Record LED
4 Ahead LED
5 Behind LED
6 +5V
7 Ground
8 Ground
9 Chassis
13

MEMORY ADDITION
To add memory to your BEL 6110 you will need to purchase extra memory modules
and an Eprom set.
To upgrade to 16m (84 secs stereo) you will require:-
1 off BEL 6110 memory module (8 Mbyte)
1 off BEL 6110 Eprom 16m - H
1 off BEL 6110 Eprom 16m - L
On CPU printed circuit board:-
Add memory module to Bank 1 and replace U22 with -H Eprom and U23 with -L
Eprom.
To upgrade to 32m (168 secs stereo) you will require:-
2 off or 3 off BEL 6110 memory modules (8 Mbyte) depending on existing memory
1 off BEL 6110 Eprom 32M - H
1 off BEL 6110 Eprom 32M - L
On CPU printed circuit board:-
Add memory modules to fill ALL banks (0-3) and replace U22 with -H Eprom and
U23 with -L Eprom.
To access CPU printed circuit board - remove power IEC connection and then
remove cover (19 off pozi type screws).
* see Printed Circuit Board layout drawing in service section.
POWER ON RESET
To reset the BEL 6110 to default settings proceed as follows:-
Power unit off
Power unit on and while the LCD display is showing the ÒLOGONÓ message Model/Version
etc, press the ÒSETÓ key and hold for approximately 3 seconds. A reset will now be initiated.
The display will acknowledge this by flashing the message Òpower-on resetÓ in the top left
corner of the LCD.
Default settings are:- Digital Ref: Audio in
Tracking mode - follow, 1 frame flywheel
Audio Mode - stereo
Audio Source - Analog
LTC editor stripping start 00:00:00:00
LTC editor video system - PAL
14

SPECIFICATION
TV system PAL or NTSC
Frequency response 20Hz - 20kHz ± 1dB
Dynamic range 96dB
Signal to noise ratio -94dB. r.m.s. 20 - 20kHz
Distortion less than 0.015% at 1kHz
Conversion accuracy A/D 18 bit Delta Sigma
64 x oversampled
D/A 20 bit 8 x oversampled
Sampling rate 48 kHz. (Internal reference)
Inputs Electronically balanced 25kW
Outputs Electronically balanced 50W
Max. drive capability +22dBu
(factory set for +18dBu)
Digital I/O Input AES/EBU 32 - 48kHz (nominally 48kHz)
Output AES/EBU 48kHz
Reference 1. Internal crystal (48kHz)
2. Audio Input - Locks to AES Input frequency
3. External AES/EBU (48kHz)
4. External Word Clock (48kHz) (TTL)
5. External video PAL/NTSC auto select (1Vpk-pk)
RS422 serial port 38.4 kbaud, 8 data bits 1 stop bit no parity
SONY©protocol
Supply Voltages 110-120VAC and 220-240VAC 50/60Hz
Supply Currents 300MA @ 115VAC, 150MA @ 230VAC
Fuse Ratings (semi delay) 500MA @ 115VAC, 250MA @ 230VAC
15

BEL 6110 RS3422 IMPLEMENTATION LIST
00.0C Local Disable
00.11 Device Request responds with BVW-75 (21.25)
00.1D Local Enable
20.00 Stop
20.01 Play
20.02 Rec
20.04 Standby Off
20.05 Standby On
2X.11 Jog Fwd
2X.12 Var Fwd
2X.13 Shuttle Fwd
20.20 Rewind
2X.21 Jog Rev
2X.22 Var Rev
2X.23 Shuttle Rev
20.30 Pre-Roll
24.31 Cue-Up With Data
20.54 Anti-Clog Timer Disable
20.55 Anti-Clog Timer Enable
20.60 Full EE Off
20.61 Full EE Off
20.64 Edit Off
20.65 Edit On
44.04 Time Code Preset
44.05 U-Bit Preset
40.10 In Entry
40.11 Out Entry
41.30 Edit Preset
44.31 Pre-Roll Time Preset
44.32 Tape/Audio Select
41.33 Servo Ref. Select
41.34 Head Select
41.35 Colour Frame Select
41.36 Timer Mode Select
61.0A TC Gen. Data Sense
61.0C Current Time Sense
60.10 In Data Sense
60.11 Out Data Sense
61.20 Status Sense
60.30 Edit Preset Sense
60.31 Pre-Roll Time Sense
60.36 Timer Mode Sense
16

DETAIL OF SWITCHES ON FRONT
DEFAULT LCD
REAR PANEL VIEW
17
Figure 2
Figure 3
Figure 4

FRONT PANEL LAYOUT
18
Audio Store Memory Options - Maximum in Stereo
Standard 42.24 Secs 8 Mbyte Option 1 84.48 Secs 16 Mbyte Option 2 168.96 Secs 32 Mbyte

REAR PANEL LAYOUT
19

BLOCK DIAGRAM
20