Adrienne Electronics AEC-BOX-1 Manuel utilisateur
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AEC-BOX-1
INSTR CTION MAN AL
ADRIENNE ELECTRONICS
CORPORATION
(Play Speed LTC Reader with RS232/RS422 Outputs)
The serial interface is programmed as follows (change as needed):
Protocol:__________ Op Mode:____________ Address:__________
Baud Rate:_________ # Data Bits:________ Parity:___________
(protocol related)
1 2 3 4 5 6 7 8
Switches = _ _ _ _ _ _ _ _
Third Edition January 1997
Copyright (C) 1997 by Adrienne Electronics Corporation
7225 Bermuda Road, nit G * Las Vegas, NV 89119 * .S.A.
tel:+1-702-896-1858 fax:+1-702-896-3034 www.adrielec.com
Printed in .S.A. All rights reserved.
AEC-BOX-1 Manual Page 1 of 20 January 1997
*** FCC NOTICE ***
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, could cause harmful interference to
radio communications. Operation of this
equipment in a residential area may cause
harmful interference, in which case the user
will be required to correct the interference
at his or her own expense.
*** COPYRIGHT NOTICE ***
You are authorized to copy and make changes to the firmware for
this product only as described in this manual. Any other copies
or changes constitute an infringement of our copyright.
*** TRADEMARK NOTICES ***
Adrienne, AEC, AEC-BOX, PC-207M, PC-LTC, PC-VITC, and PC-VLTC
are trademarks of Adrienne Electronics Corporation.
SMPTE is a registered trademark of
The Society of Motion Picture and Television Engineers, Inc.
AEC-BOX-1 Manual Page 2 of 20 January 1997
TABLE OF CONTENTS
Title Page and Copyright Notice.................................1
FCC and Trademark Notices.......................................2
Table of Contents...............................................3
Introduction....................................................4
Getting Started Quickly.........................................4
Specifications..................................................5
Hardware Description............................................6
External Cabling Installation...................................7
AC Input Voltage Range Selection................................8
DIP Switch Programming.........................................10
BINARY Message Protocol........................................12
ASCII Message Protocol.........................................13
Break Character Detection......................................14
Serial Interface Standards.....................................15
Troubleshooting Guide..........................................16
Warranty Registration, Warranty Service, etc...................17
ASCII Code Chart...............................................18
Number System Conversion Table.................................19
Where to Order Copies of Standards.............................20
ser Feedback Request........................................back
Ordering Guide...............................................back
Schematics...................................................back
AEC-BOX-1 Manual Page 3 of 20 January 1997
INTROD CTION
Adrienne Electronics Corporation (AEC) developed the AEC-BOX-1
play speed LTC reader with RS232 and RS422 outputs to provide a
low cost way of reading Longitudinal Time Code (LTC) using a
variety of personal computers and other devices. It works
equally well with both the SMPTE (30fps) and EB (25fps) time
codes, in both the forward and reverse tape directions.
Longitudinal Time Code (LTC) is a specialized audio signal which
contains digital time-of-day and frame count information relating
to an accompanying video signal. As an audio signal, it can be
recorded and played back by video and audio tape machines. LTC
is used for audio/video editing, logging, and/or automation
purposes. Time code standards have been around for many years,
and are sponsored by both SMPTE (for NTSC) and the EB (for PAL).
Related products include our PC-LTC, PC-VITC, and PC-VLTC
families of Longitudinal Time Code (LTC) and Vertical Interval
Time Code (VITC) readers and generators for IBM PC personal
computers, along with other members of the AEC-BOX family of
standalone VITC, LTC, video, RS232, and RS422 interface boxes.
Call us if you want more information on any of these products.
GETTING STARTED Q ICKLY
If you want to use your AEC-BOX-1 right away, without reading the
whole manual, just do the following:
1) Plug the AC power cord into a suitable voltage AC outlet.
2) Connect the LTC input signal to the "LTC IN" RCA jack.
3) se a serial data cable to connect the 9-pin D connector
(on the box) to your computer or other device.
The box should now be spewing out serial data corresponding to
the time code it sees at the LTC input. The software protocol is
described elsewhere in this manual. If no LTC is present, the
power LED will blink every 1.5 seconds, and a short message will
be sent. If something doesn't work, you will have to carefully
read the "INSTALLATION" section of this manual.
AEC-BOX-1 Manual Page 4 of 20 January 1997
AEC-BOX-1 SPECIFICATIONS
LTC INP T (factory default single-ended mode):
Impedance 20kohms typical
Input Level 100mVpp to 20Vpp
DC on Input +1V maximum
LTC INP T (optional differential mode):
Impedance 20kohms typical
Input Level 100mVpp to 20Vpp
DC on Input +1V maximum
CMRR >26dB @ 60Hz
LTC READER:
Speed Range (2) 1/30x to 2.2x (w.r.t. play speed)
Tape Direction Forward or Reverse
Bits Read ALL time, user, and control bits.
Time Code Standard Both SMPTE and EB , without modification.
MISCELLANEO S:
Box Dimensions (3) 16cm wide x 5cm high x 21cm long
Box Weight 1.2kg
Power Consumption 7W
Temperature Range 0 to 50 degrees Centigrade
Relative Humidity p to 95%, noncondensing
Notes:
(1) All specifications are subject to change without notice.
(2) LTC signals at much below play speed are often too distorted
to read. Varies with tape format, tape, machine, etc.
(3) Allow at least 6cm in rear for power and other connectors.
AEC-BOX-1 Manual Page 5 of 20 January 1997
AEC-BOX-1 HARDWARE DESCRIPTION
Throughout the following discussion you may want to refer to the
AEC-BOX-1 schematic which is in the back of this manual. If your
box has been customized in any way for your application, then the
descriptions below may not be entirely accurate.
The power supply primary side comprises power transformer T1 and
thermal "fuse" device F1. Of special note is the fact that this
"fuse" does not burn out. If it trips, turn the power off for
one minute to let it cool/reset, then turn the power back on.
The power supply secondary side starts with full wave rectifiers
DB1 and DB2, plus large filter capacitors C72, C73, C82, and C83.
The resulting unregulated DC supplies are then passed through
voltage regulators 70(+5V), 72(+12V), and 73(-12V).
The LTC input at RCA jack J1 first goes through a differential
amplifier centered about 10A. Note that the outer conductor on
the RCA jack is normally grounded, but may be converted to a true
differential input by cutting jumper X3. See the INSTALLATION
section for details.
The output of the differential amplifier is AC coupled to
eliminate DC offsets, then is fed into the window comparator made
up of quad comparator 9 and surrounding components. This
comparator automatically senses the incoming signal level and
adjusts itself as needed to recover the LTC transition data even
from very poor quality input signals.
The complementary outputs of the window comparator go directly to
microcomputer 4, which decodes the LTC data via a proprietary
software algorithm.
Microcomputer 4, together with address latch 20 and EPROM 1,
form a completely self contained (but miniature) computer system.
DIP switch SW1 allows easy modification of box operating modes,
baud rates, and other features.
Serial data from microcomputer 4 is translated to RS232 levels
by 7, and is translated to RS422 levels by 14. Nine pin "D"
connector J3 contains the RS232 and RS422 transmit data lines.
AEC-BOX-1 Manual Page 6 of 20 January 1997
AEC-BOX-1 EXTERNAL CABLING INSTALLATION
LTC INP T CONNECTION:
RCA jack J1 is the high impedance (20kohm) LTC input connector.
The AEC-BOX-1 can read both SMPTE and EB time codes without
modifications.
As shipped from the factory, the RCA jack's outer conductor is
connected to frame ground (the box chassis) via shunt X3 (next to
J1). You may remove X3 in order to get a true differential LTC
input, provided that the common mode voltage (usually 50/60Hz
hum) is less than 2Vrms. In this configuration, you may also
want to wrap electrical tape around the outside of the RCA input
plug so that its outer conductor cannot short to the rear panel
inadvertently.
SERIAL O TP T CONNECTIONS:
If you ordered a serial data cable with your AEC-BOX-1, just plug
it in to the 9-pin "D" connector (which has socket contacts) on
the back of the unit. Otherwise, you may use the kit of mating
connector parts to wire up to the box as follows:
Pin # | Function
========================
1 |
2 | TX422-
3 |
4 |
5 | TX232
6 |
7 | TX422+
8 |
9 | GND
Notes:
1) Tiny pin numbers are molded into the connector face.
Be careful not to be "off by one".
2) For RS422, note that the pinout is that of an ESbus Tributary.
3) Limit RS232 cables to 30 meters maximum.
4) Limit RS422 cables to 1200 meters maximum.
AEC-BOX-1 Manual Page 7 of 20 January 1997
AC INP T VOLTAGE RANGE SELECTION
Normally all AEC-BOX's are shipped with the transformer primary
wired for 100-130VAC. Your box will bear a special marking if it
has been wired for 200-260VAC instead. For your own safety,
PLEASE do not proceed unless the line cord has been unplugged!
Just turning off a power switch somewhere is not sufficient!
*** WARNING ***
NEVER OPEN P THE BOX unless the line cord has
been unplugged from its AC power source! To
do otherwise risks damage to your AEC-BOX, and
could even KILL you! We cannot assume
responsibility for such careless behavior.
Box Cover Removal:
First you must NPL G the AC power cord, remove all other cables,
then remove the bottom cover as follows:
1) se a small (#1) Phillips screwdriver to remove the two
small black screws which are on each side of the box.
2) Slide off the front and back black plastic bezels.
3) Turn the box over, then lift off the BOTTOM cover.
Note that you are now exposing yourself to a severe (FATAL) shock
hazard if the box is still plugged in to an AC power source!
Voltage Strap Modification for 200-260VAC:
In the area underneath power transformer T1, you will find four
large holes in a row, with "115V" and "230V" markings adjacent.
sing sharp nosed cutters, or some other appropriate tool, cut
out at least 2mm of the narrow trace next to each of the "115V"
markings. Then solder a short wire between the two holes closest
to the "230V" marking, being careful not to poke the ends of the
wire too far into the holes (could damage power transformer T1).
Also make sure that the wire you added is flush with the bottom
of the board, and will not even come close to touching to bottom
cover.
Voltage Strap Modification for 100-130VAC:
In the area underneath power transformer T1, you will find four
large holes in a row, with "115V" and "230V" markings adjacent.
Remove the wire between the two holes closest to the "230V"
marking. Then solder a short wire between each pair of holes
closest to the "115V" markings, being careful not to poke the
ends of the wire too far into the holes (could damage power
transformer T1). Also make sure that the two wires you added are
flush with the bottom of the board, and will not even come close
to touching to bottom cover.
AEC-BOX-1 Manual Page 8 of 20 January 1997
AC POWER INP T VOLTAGE RANGE SELECTION
(continued)
Box Cover Replacement:
Basically, just follow the earlier instructions in reverse order
(power to the box must be OFF):
1) Put the bottom cover back in place.
2) Slide a black plastic bezel onto each end of the unit. The
box looks better if the two small molding marks are facing
towards the bottom of the unit.
3) Reattach the bezels to the chassis with the four small
black screws you removed earlier. Be careful not to strip
the threads in the aluminum side extrusions!
Label The Line Cord:
Attach a small label to the plug end of the line cord, so that
the next person to use this AEC-BOX will know what AC power input
voltage range it expects to see.
Test Your Work:
BEFORE connecting any cables to the box, plug it in to the
appropriate AC power source and make sure it works (no smoke).
INSTALLING YO R OWN AC POWER LINE PL G
If the plug on the end of the AC line cord is not suitable, you
can cut it off and put on your own. Where possible, please wire
the new plug as follows:
1) Green = Ground (Chassis)
2) Blue = Neutral
3) Brown = Hot
In no case should the green wire be connected to anything but
ground! se a continuity tester to verify that the ground lug on
your new power cord is connected directly to the AEC-BOX chassis.
AEC-BOX-1 Manual Page 9 of 20 January 1997
DIP SWITCH PROGRAMMING
Box Cover Removal:
First you must NPL G the AC power cord, remove all other cables,
then remove the top cover as follows:
1) se a small (#1) Phillips screwdriver to remove the two
small black screws which are on each side of the box.
2) Slide off the front and back black plastic bezels.
3) Lift off the top cover.
Note that the bottom cover will fall off easily at this point,
exposing you to a severe (FATAL) shock hazard if the box is
still plugged in to an AC power source!
*** WARNING ***
NEVER OPEN P THE BOX unless the line cord has
been unplugged from its AC power source! To
do otherwise risks damage to your AEC-BOX, and
could even KILL you! We cannot assume
responsibility for such careless behavior.
Changing DIP Switch (SW1) Settings:
Note that the switches are numbered 1 through 8. Also note the
small "1" and "0" numbers which are on the left and right ends of
SW1. To set a switch to be a "1", simply press down on the "1"
(OPEN) end of that switch. Conversely, to set a switch to be a
"0", simply press down on the "0" end of that switch. All done!
DIP Switch Functionality:
Switch Function
1 Baud Code #1
2 Baud Code #2
3 Odd(1) or Even(0) Parity
4 Parity Enabled(1) or Disabled(0)
5 Seven(1) or Eight(0) Data Bits, & Protocol Control
6 reserved (set to 0)
7 reserved (set to 0)
8 reserved (set to 1)
The two "Baud Code" bits function as follows:
1 2
1 1 => 38400 baud
1 0 => 19200 baud
0 1 => 9600 baud
0 0 => 1200 baud
Note that at 1200 baud, it normally takes longer than one LTC
frame to transmit a message, so some LTC frames will be skipped.
AEC-BOX-1 Manual Page 10 of 20 January 1997
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