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Tutorials Discussion, Build your own Nullmodem Cable at Dreambox Clones forum; You can find online a lot of sites offering Serial Nullmodem cables, but not every cable will work with DreamUP ...

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Build your own Nullmodem Cable
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kess78
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Build your own Nullmodem Cable - 15-March-2011, 21:46

You can find online a lot of sites offering Serial Nullmodem cables, but not every cable will work with DreamUP and your DreamBox.
Nullmodem cables are not all the same !

Nullmodem DB9 Cable types:
- No Hardware handshaking
- Loopback handshaking
- Partial handshaking
- Full handshaking

When you buy a nullmodem cable online, no one tells you which type that cable is, so you won't know if it works or not (generally not)...

After a lot of hours spent with my PC, my box and my cable, with no success, I decided to try out every cable by building my owns.

The result is that the only working nullmodem cable is the FULL HANDSHAKING TYPE.

Here you can find the connection schema in order to build your own cable by using 2x DB9 female connectors.

1st conn / 2nd conn
1 + 4 --- 6
2 --- 3
3 --- 2
5 --- 5
6 --- 1 + 4
7 --- 8
8 --- 7
pin 9 is not connected

Hope this helps...
   
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freedream22
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16-March-2011, 00:14

I use the simple one from a long time and it works great.

1 1
2--3
3--2
4 4
5--5(ground)
6 6
7 7
8 8
9 9

Cheers!
   
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16-March-2011, 12:20

Quote:
Originally Posted by freedream22 View Post
I use the simple one from a long time and it works great.

1 1
2--3
3--2
4 4
5--5(ground)
6 6
7 7
8 8
9 9

Cheers!
I've tried your cable, this is the simple one with no handshaking. With this configuration, DreamUP didn't find my box at all.
Nice to know that it works for you :-)
   
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