tbs6980 diseq 1.1 howto?

[guacharaca]

Hi Sami

I have also had problems with several low end 1X4 diseqc switches. They are not labelled as 1.0 or 1.1. I have had only limited success. I also use DVBdream. What brand is your 1X8 that works brilliantly so I can purchase the same?

[sami8519]

I bought that diseqc from ebay:

Code: Select All Code

http://cgi.ebay.com/SW81-8x1-DiSEqC-Switch-8-1-Satellite-Multi-Switch-/350368116109?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item5193912d8d

It is 8x1 diseqc 1.1 compatible.

Regards
Sami.

[guacharaca]

Thanks. I will buy that one. There is a very small chance that the code written for an 8X1 is better than the code written for a 4X1.

I just did an experiment with my 1X4 diseqc switches that did not work with this card. My old infusion can send either 1.0 or 1.1 commands. All my switches only responded to Diseqc 1.0 commands. They do not respond to 1.1 commands. I believe your theory that the TBS card can not send 1.0 commands is correct. I only need to purchase a 8X1 or 4X1 that will respond to 1.1 commands.

[cody]

ok, let me give you some information that might help:

* i guess your 4x1 switches are "committed" and so the diseqc commands for switching between the ports are:

- E0 10 38 F0 for selecting input 1 (A/A)
- E0 10 38 F1 for selecting input 2 (A/B)
- E0 10 38 F2 for selecting input 3 (B/A)
- E0 10 38 F3 for selecting input 4 (B/B)

and your 8x1 switches are "uncommitted" which use the following diseqc commands for switching between the ports: "E0 10 39 XX", where XX is F0 to FF and is the determining the port number.

* TBS 6980 hardware and driver doesn't care about the actual diseqc command and it's meaning, because that is setup and send by the DVB application software. so, after application send the diseqc command to the driver it just pass it to the hardware

the above means that if there is no some strange hardware incompatibility between TBS 6980 and your switch then if you setup correct diseqc command in the DVB application software - the same correct diseqc command will be send by TBS 6980 hardware after the DVB application software pass it to the driver. i hope that will give at least some clearance, why actual diseqc version is not important for the TBS 6980 driver and hardware.

[guacharaca]

Success. I read your explanation and did a little more reading on the internet. I realized that this must be a situation of human error. Before in the DVBDream diseqc set-up menu, I had tried to set the diseqc switch up only using the four port switch menu. It worked only rarely so I then tried to write in the raw diseqc commands in the space that shows an example of a raw command. It still did not work so I abandoned that idea all together. I now realize when reading your last message that I had erroneously entered the “Uncommitted” raw commands for my 4X1 instead of the “Committed” raw commands. There is one number difference (38 vs. 39) between the two. This might also explain why Sami had the same problem. His 8X1 would function because the 8X1 uses “uncommitted” commands while the 4X1 uses the different “committed” commands. Additionally I wrote the committed commands in twice for a more confident switch. To be perfectly clear, for DVBdream, if one has a 4X1 diseqc, one has to write in the "commited" raw diseqc commands in the appropiate space provided for it. For a 8X1, one has to write in the different "uncommited" raw diseqc commands.

On another unrelated note, I had done all my original tests with the diseqc only 1 foot away from the card so distance and voltage drop was not a consideration. With this recent test, my diseqc switch is about 200 feet from the card which is normally a big no no because of distance. However my lnbs way out in the back yard are only single polarity lnbs. Using the lower vertical voltage did not make the switch function properly so I bumped it up to the higher horizontal voltage (still receive the same tps because lnb s are single polarity) and now the switch works 100% of the time at such a great distance. That diseqc signal works better riding the higher voltage when it has to reach a switch at a long distance. If I put dual polaity lnbs out there, I will run an extra RG6 back to the building and bring the switch closer to the card.

[sami8519]

I will try it out today.Thank you very much guacharaca for your tests, and thanks for cody for bringing the diseqc commands.