KNX interface

[AmrMustafa]

Dear all,

hope All is well...

I have a problem with my project KNX

my project contains ( PS 640mA - 5 Switch Actuator - Sensor and Keypads ) and I use Tree and line topology like the attached photo

and All Buses within 200 Meter not more than that ...

Q1  while programming and downloading my program I face the problem when I use my USB knx interface when I terminate it in the bus ( Must terminate and connect it directly to Power Supply to make full download ) what are the reasons?

Q2 when I use Ls100100 as an interface to download I face the same problem despite Ls100100 connecting directly after the power supply 

I did something ( I changed the Configuration of KNX connection in LS100100 to TP/UART) and after this modification, I can download my program for any device 

Question:  did this modification can affect if I want to control through IPAD or mobile phone via remote internet?

thanks 

Amr Mustafaa

[Thomas_Rohde]

Hello AmrMustafa,

to "Q1  while programming and downloading my program I face the problem when I use my USB knx interface when I terminate it in the bus ( Must terminate and connect it directly to Power Supply to make full download ) what are the reasons?"
This is very difficult to answer by having so little details. When I read that you have a cable length of about 200m and your interface is not working properly at some point within your system ... I guess a bit far away from the powersupply but within the 200m. This can be an indication that telegramms cant be identified properly due to a low voltage level. And by your comment that it is properly working next to the powersupply. Please check the busvoltage at the point where you faced the issue with the interface. It shouldnt be less then 21V.

to "Q2 when I use Ls100100 as an interface to download I face the same problem despite Ls100100 connecting directly after the power supply "
This goes as well in the same direction as above.

to "I did something ( I changed the Configuration of KNX connection in LS100100 to TP/UART) and after this modification, I can download my program for any device ..."
This sounds more like you have trouble with your amount of telegramms on the bus (busload). But on the other hand then there would be no change when you mount it directly to the powersupply. So something is really strange within your installation.

to "Question:  did this modification can affect if I want to control through IPAD or mobile phone via remote internet?""
No it does not have an impact on your remote connection.

[AmrMustafa]

dear 
Bus voltage at the end of the last device in every CABLE  is 30-29 V

[Thomas_Rohde]

Hello AmrMustafa,

are you sure that you have no loop somewhere?!
Can you devide your setup in parts and reconnect step by step parts by monitoring where the mistake (no possibility to download) starts?

What about your Busload?

[domotiqa]

Il also think that you have loop, or broken product or electrical short.

As explain above, you have to unplug zone by zone until you find the area that is problematic.

Do you have other Ip interface ?