 21 pin SCART FEMALE connector at the video/TV | The Scart (Syndicat des Constructeurs d"Appareils Radiorecepteurs et Televiseurs)
connector is used for combined audio and video connections.
A formal description is given in the CENELEC EN 50 049-1:1989 standard or in
the IEC 933-1 standard.
Different pin-configurations exist. Which confirations are available depends
on the video device used. Sometimes one can choose the configuration (like composite
or S-video) by changing a software setting.
Two status signals define (partly) which video signals are active. A video device
can use these status signals to automatically switch between internal or external
audio/video signals.
|
Pin
|
Name
|
Description
|
Signal Level
|
Impedance |
|
1 |
AOR
|
Audio Out Right
|
0.5 V rms
|
<1k ohm
|
|
2 |
AIR
|
Audio In Right
|
0.5 V rms
|
>10k ohm
|
|
3 |
AOL
|
Audio Out Left + Mono
|
0.5 V rms
|
<1k ohm
|
|
4 |
AGND
|
Audio Ground
| | |
|
5 |
B GND
|
RGB Blue Ground
| | |
|
6 |
AIL
|
Audio In Left + Mono
|
0.5 V rms
|
>10k ohm
|
|
7 |
B |
RGB Blue In
|
0.7 V |
75 ohm
|
|
8 |
SWTCH
|
Audio/RGB switch / 16:9, slow switch (10-12v), to force tv to switch on a mode (depends of the tv(old), sometimes set tv to AUX)
| | |
|
9 |
G GND
|
RGB Green Ground
| | |
|
10
|
CLKOUT
|
Data 2: Clockpulse Out, used in the 80"s by old videotapes
| | |
|
11
|
G |
RGB Green In
|
0.7 V |
75 ohm
|
|
12
|
DATA
|
Data 1: Data Out (Unavailable ??)
| | |
|
13
|
R GND
|
RGB Red Ground
| | |
|
14
|
DATAGND
|
Data Ground, remote control, wired and used by old videotape recorders
| | |
|
15
|
R |
RGB Red In / Chrominance
|
0.7 V (Chrom.: 0.3 V burst)
|
75 ohm
|
|
16
|
BLNK
|
Blanking Signal, fast switch (1-3v), to force tv to switch on a mode (depends of the tv(recent), sometimes set tv to AUX)
|
1-3 V=RGB, 0-0.4 V=Composite
|
75 ohm
|
|
17
|
VGND
|
Composite Video Ground
| | |
|
18
|
BLNKGND
|
Blanking Signal Ground - ground for slow or fast switch (ground for pin 8 or 16)
| | |
|
19
|
VOUT
|
Composite Video Out
|
1 V |
75 ohm
|
|
20
|
VIN
|
Composite Video In / Luminance
|
1 V |
75 ohm
|
|
21
|
SHIELD
|
Ground/Shield (Chassis)
| | |
S-Video Connection
| Output connector | Input connector |
|---|
| 1 | Audio right out | 2 | Audio right in |
| 3 | Audio left (or mono) out | 6 | Audio left (or mono) in |
| 4 | Audio return | 4 | Audio return |
| 15 | Chrominance out | 15 | Chrominance in |
| 13 | Chrominance return | 13 | Chrominance return |
| 8 | Video status out | 8 | Video status in |
| 19 | Luminance out | 20 | Luminance in |
| 17 | Luminance return | 18 | Luminance return |
| 21 | Shield | 21 | Shield |
Composite Video Connection
| Output connector | Input connector |
|---|
| 1 | Audio right out | 2 | Audio right in |
| 3 | Audio left (or mono) out | 6 | Audio left (or mono) in |
| 4 | Audio return | 4 | Audio return |
| 8 | Video status out | 8 | Video status in |
| 19 | Composite video out | 20 | Composite video in |
| 17 | Composite video return | 18 | Composite video return |
| 21 | Shield | 21 | Shield |
(Composite) Decoder Connection
| Receiver connector | Decoder connector |
|---|
| 1 | Audio right out | 2 | Audio right in |
| 2 | Audio right in | 1 | Audio right out |
| 3 | Audio left out | 6 | Audio left in |
| 6 | Audio left in | 3 | Audio left out |
| 4 | Audio return | 4 | Audio return |
| 8 | Video status in | 8 | Video status out |
| 19 | Baseband out (scrambled) | 20 | Baseband in |
| 17 | Baseband out return | 18 | Baseband in return |
| 20 | Composite video in (unscrambled) | 19 | Composite video out |
| 18 | Composite video in return | 17 | Composite video out return |
| 21 | Shield | 21 | Shield |
EasyLink Connection (additional)
| Television connector | Video recorder connector |
|---|
| 10 | I/O Control Bus | 10 | I/O Control Bus |
EasyLink enables bi-directional communication between a television set and a video recorder.
This way a video recorder can, for example, copy the channel settings of the television set.
Who knows the details?
Signal Levels
| Signal | AC level | DC level | Impedance |
|---|
| Red, green, blue | Peak to blanking: 0...0.7 V ±3 dB | 0...2 V | 75 Ohm |
| Sync | Peak to peak: 0...0.3 V -3 dB...+10 dB | 0...2 V | 75 Ohm |
| Composite video | White to sync: 0...1.0 V ±3 dB | 0...2 V | 75 Ohm |
| Chrominance | 0...0.3 V -3 dB...+10 dB | 0...2 V | 75 Ohm |
| Luminance | 0...1.0 V ±3 dB | 0...2 V | 75 Ohm |
| MAC | Black to white: 0...1.0 V ±3 dB | 0...2 V | 75 Ohm |
| Audio in | 0.2...2.0 V (nominal: 0.5 V) | | >=10 kOhm |
| Audio out | Nominal: 0.5 V (maximum: 2.0 V) | | <=1 kOhm |
| Video status |
Low data rate communication: 0.0...2.0 V
(e.g. remote control; Easylink) |
Internal: 0.0...2.0 V
External (16:9): 4.5...7.0 V
External (4:3): 9.5...12.0 V |
In: ZR>=10 kOhm
ZC<=2 nF
Out: ZR<=1 kOhm
|
| RGB status | | Internal: 0.0...0.4 V
External: 1.0...3.0 V | 75 Ohm |
|  21 pin SCART MALE connector at the cable |
