Heiko's SIRCS Page
Subject: D7 remote control - do it yourselfHello DAT-heads,
about half a year ago, I posted some info about how to build an interface that plugs into the D7 7-pin connector and gives s/p-dif coax input and output. At that time I didn't manage to find out how the "sircs"-pin (serial infrared remote control signal) of the 7-pin connector could be used.
In the meantime, I built a receiver and transmitter for infrared remote control signals and wrote a little PC program to decode and generate these signals. With a simple interface for the D7 7-pin connector, I'm also able to control my D7 from a PC. Thus, features like start-id edit and renumber can be accessed without a special sony remote control box (RMT-D7 or RM-D3K) - unfortunately the D7 itself doesn't have the necessary buttons ...
This mail includes details about the remote control signal format used by Sony as well as a list of remote control messages that are understood by the D7. For further information (or to download the software), have a look at http://www.fet.uni-hannover.de/purnhage/dat/dat.html
All usual discalimers apply - you have to build and operate such a DIY remote control at your own risc!
I hope that this information is of interest. Any comments are welcome!
Heiko
SIRCS - Serial Infrared Remote Control System (Ver. 4)
Heiko Purnhagen 27-nov-95, 30-jun-96, 19-aug-96, 08-sep-96, 01-apr-97, 981112
e-mail: purnhage@tnt.uni-hannover.de
WWW: http://www.fet.uni-hannover.de/purnhage/
This program may be copied according to the GNU General Public Licence.
Changes:
SIRCS 27-nov-95 first version
SIRCS2 30-jun-96 improved handling of auto-repeat keys
added non-verbose version of "transmit sony msgs"
SIRCS3 19-aug-96 added command line options
added cli/sti and timing check
SIRCS4 08-sep-96 added 38.4 kHz carrier generation to drive
an IR-LED directly from TD
About this program
------------------
This program is written in Turbo Pascal 6.0 and requires a reasonable
fast PC (486SX 25 MHz or even 386DX 6 MHz is sufficient). Since
direct access to the PC hardware is employed, this program must be started
directly from DOS (and not from a DOS-Window within MS-Windows).
In order to be able to receive and transmit (infrared) remote control
signals, you have to connect an appropriate interface to the serial
port of your PC. This interface either containes an infrared LED and/or
photodiode to transmit and/or receive the infrared remote control signal
or it is connected directly to the device to be controlled.
A typical infrared transmitter generates a 40 kHz carrier which is
switched on and off according to the serial remote control signal
and then transmitted by the LED.
A typical infrared receiver contains a circuit that detects whether
or not the photodiode is receiving a 40 kHz carrier.
A typical direct interface has to convert (or just limit) the
logical levels of the serial remote control signal to those required
by the device to be controlled.
The different signals of the serial interface connector are used in
a slightly odd way here:
SG ground
CTS signal from receiver
RTS signal to transmitter/device
DTR positive voltage providing some power for interface circuits
TD normal mode: positive voltage (as "DTR")
LED mode: transmit signal (with 38.4 kHz carrier)
Serial Interface Connector
--------------------------
D25 D9 in/out signal
1 - - FG Frame Ground
2 3 O TD Transmit Data
3 2 I RD Receive Data
4 7 O RTS Request to Send
5 8 I CTS Clear to Send
6 6 I DSR Data Set Ready
7 5 - SG Signal Ground
8 1 I DCD Data Carrier Detected
20 4 O DTR Data Terminal Ready
22 9 I RI Ring Indicator
+3V..+12V = active = space = 0
-3V..-12V = inactive = mark = 1
A simple interface for Sony DAT TCD-D7 / TCD-D8
-----------------------------------------------
Note: The D7 requires a low-active serial remote control signal !!!
PC serial (D9) D7 / D8 connector
10kOhm 10kOhm
RTS (pin 7) o----RR---+---RR----o sircs (pin 7) 1 2 3 4
| +---------+
C z-diode | o o o o |
A ZPD 4.3V | o o o /
| +--------
SG (pin 5) o---------+---------o ground (pin 6) 5 6 7
For further information about the D7 connector, have a look at
http://www.fet.uni-hannover.de/purnhage/dat/dat.html
An optocoupler-based interface for Sony DAT TCD-D7 / TCD-D8
-----------------------------------------------------------
Note: This interface is inverting, so you have to feed it
with an high-active SIRCS signal !!!
D8 connector
+-----------o # 2 +4V/+5V
|
|
R 10 kOhm
R
PC serial (D25) |
470 Ohm |
RTS (pin 4) o---RRR------+ +-----------o # 7 sircs
pin1| |pin5
| |
A -> C
C -> E
| |
| |
SG (pin 7) o------------+ +-----------o # 6 ground
pin2 pin4
CNY17
or similar
This interface was designed by Ulrich Hornstein .
His original description is also available on
http://www.fet.uni-hannover.de/purnhage/dat/dat.html
Connecting an IR receiver module
--------------------------------
There is a cheap ( < 5 US$ ) IR receiver module available from
"Conrad Electronic" (Nr. 177695). It requires a few mA power at 5 V and has a
low-active output. It can be connected directly to a TCD-D7 / TCD-D8.
To connect it to the PC's serial port (for usage with SIRCS), an additional
5 V power source / voltage regulator and a 4.7 kOhm pull-up resistor is
required.
Driving an IR-LED directly from TD
----------------------------------
It is also possible to connect an IR-LED directly to the TD pin of the PC's
serial port to transmit SIRCS messages with an 38.4 kHz carrier signal.
470 Ohm
TD o---RR---+
|
A IR
C LED
|
SG o--------+
If you have a PC (laptop) with an IR port, just map this port to a COM
port and use SIRCS in LED-mode on with this COM port to send remote
control signals via the PC's built-in IR port (successfully tested by
Maciej Jesmanowicz ).
Simple IR receiving circuit
---------------------------
Unfortunately, the IR port can not (yet) be used to read IR signals
with SIRCS. But Maciej Jesmanowicz suggested a simpel
input circuit (1 resistor and 1 IR phototransistor) that seems to work
if you place IR remote control very close (less than 25.4 mm ;-) to
the phototransistor ...
DTR o---+
|
R 10 kOhm
R
|
CTS o---+
|
C infrared
E phototransistor
|
SG o---+
Sony serial remote control signal format
----------------------------------------
A message contains 12 bits and is transmitted every 45 ms (22.2 times
per second) as long as the key on the remote control is held down. A
message is transmitted at least 3 times.
The signal for the message "pause" for a Sony DAT recorder is
......XXXX.XX.X.X.XX.XX.XX.X.X.X.XX.XX.XX......
where X means an active signal (40kHz carrier transmitted by infrared
remote control) and . means no signal. Each X or . has a duration
of 0.6 ms. The message consists of a start pulse (2.4 ms) which is
followed by 12 data pulses (0.6 ms or 1.2 ms). Each pulse is followed
by a 0.6 ms pause. A 0.6 ms data pulse means a "0", a 1.2 ms pulse a "1".
This program can store such messages in a file, one message per line.
The DAT "pause" message shown above can be stored as
100111000111:pause
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