hi all,
on
i got an LDT LS-DEC-8x2 module to control Viessman 4011 color signals, i am using it in a H0 layout with Marklin Mobile station.

i followed the instructions and got it to work, assigned MM address 145 & 149 for the two banks, connected the viessman signal black with the +5 as indicated, red and green to RT1 and GN, jumper J1 removed, jumper j2 let it. jumper j3 removed after programming. Using track current for both input and output current.

The issue is, i noticed that the light intensity was quite low. i tried to connect the signal to an external 12V DC power supply, and that made a lot of difference, it was much brighter. so i checked the voltage, and saw that the light that was ON had barely +5 volts, while the light that was off was at 0 volts.


what am i doing wrong ? thanks for any tip

thx for your kind reply, but the LS-DEC-8x2 instructions clearly say that Viessmann signals have common anode, i report below an extract from the instructions :

Common connection:
All LED-signals of any manufacturer are designed in accordance to the
same principle. One wire of all light emitting diodes of a signal will be
generally connected to a common cable. Depending if all anodes or all
cathodes are connected together the signals will be called as common
anodes- respectively common cathodes-signal.
If you use signals with common anodes (e.g. supplied from Viessmann
or alphamodell) you have to clamp this cable to the connection marked
'+'. In addition you shall not insert the connection plug bridge in J1 in
this case.
If you use signals with common cathodes you have to clamp this cable
to the connection marked '-'. In addition you shall insert the connection
plug bridge in J1 in this case.
The second connection of each light diode is separated and mostly color
marked at the end and contains a series resistor.

of course i could try to follow your suggestions, but i really was expecting this to work straight forward, so i'm still wondering if i'm missing something, i have a defective unit, or else...

thx