Becker Unilink
This project is dedicated to support the Unilink changer bus on Becker car radios.
Becker has implemented some downgraded version of Unilink protocol in there radios. The hardware layer is the same like the one from Sony, but the software layer is different.
Good news is, that you can use my interface without changes to hardware (you need just another connector, at least at European radios) and you have to download a code with Becker support.
Since the Becker Unilink protocol is more different than I thought, I decided to make a seperate code for Becker units.The following features are supported by Becker units in CD changer mode (AFAIK):
- CD changers only (an MD ID is recognized as changer, but not supported by display)
- CD names in Custom File style with 8 characters/name
- Disc and track number, track and disc time
- Random play on actual disc
- Track repeat
- Fast forward and rewind
- Track scan, 12 seconds/track
While playing around with my unit, I found out that MD changer mode is also supported, with MD disc and title name. So the code while support also MD changer mode.
I have got a Becker Monza 7882 European model. There is no original Unilink connector. Just two big DIN-ISO connectors and an Mini-ISO connector field. The CDC will be connected via Mini-ISO. (Mini-ISO connectors are easy to get)
Here is the Becker Monza 7882 unit pinout:
|
Connector
A |
Connector B |
||
|
1
|
Speed signal input (speed dependent volume control) |
1 | Speaker rear right + |
|
2
|
not connected |
2 | Speaker rear right - |
|
3
|
Phone mute / audio enable |
3 | Speaker front right + |
|
4
|
Steady +12V |
4 | Speaker front right - |
|
5
|
Output automatic antenna / amplifier |
5 | Speaker front left + |
|
6
|
Lighting input |
6 | Speaker front left - |
|
7
|
Switched +12V |
7 | Speaker rear left + |
|
8
|
Ground | 8 | Speaker rear left - |
| Connector C1 |
Connector C2 |
||
| 1 | Line-out rear left |
7 | Unilink BusOn |
| 2 | Line-out rear right |
8 | Steady +12V |
| 3 | Gound line audio |
9 | Gound |
| 4 | Line-out front left |
10 | Unilink Data |
| 5 | Line-out front right |
11 | Unilink Clock |
| 6 | Line-out Subwoofer |
12 | Unilink Reset |
| Connector C3 |
|||
| 13 | Line-in phone audio |
||
| 14 | Ground phone audio |
||
| 15 | RS232 out – ST10 Firmware upgrade |
||
| 16 | RS232 in – ST10 Firmware upgrade |
||
| 17 | Steady +12V |
||
| 18 | Ground CD/Aux audio |
||
| 19 | CD/Aux line-in left |
||
| 20 | CD/Aux line-in right |
||
Great writeup! Do you have a good source for mini iso connectors? I have found some sources but they are so expensive and I’d like to buy of bunch of them.
Sorry, don’t know a source for plain connectors. Just bought some adaptor harness from old ISO to mini-ISO and cut off the old ISO standard connectors.
I can’t download schematics or firmware from Becker unilink project..site redirect me to the page with antena…can you help me?
Tried all files, they download fine for me. Also first time I got note about such problem.
May you post the ULR of the page you will be redirected?
Now everything is ok. Url was http://www.mictronics.de/2010/11/new-easystar-fpv-setup/
Hi, I have a feeling I found exactly what I need although I just understand about 2,8 % of what is written here. I have a Becker Mexico 2330 radio and I want it to recognize and play my external source as it was a CD changer. Can you help me? What do I need to get and – if possible – where do I get it?
You are right, the interface will enable the CD changer input.
You need the interface electronic based on the schematic I provided. First source would be of course making one yourself.
Hi, I have a Becker Mexico Pro (MD) 4937, which I use with both a Becker Silverstone 10CD CDC, and also a Sony MDX-62. Both of these units work fine with the radio.
What I want to do is connect both to the radio at the same time, this could be done with a Sony radio using a source selector (e.g. a Sony XA-C30).
Do you know if the Becker Unilink system can support multiple changers?
Thank you for any help.
Not sure. Might be possible, but all depends if the radio can handle the source selector.
Hi, Do you have Gerber files for PCB manufacture in Eagle or Target-3001.
Thanks