I made correction interface simply board for Viessmann Commander.
[Blocked Image: http://img-fotki.yandex.ru/get/9753/5475818.18/0_9e3fd_f2197fdf_orig]
1) It makes Smooth start of Rail DCC voltage. It allow start Rail DCC without overloadings or surge currents, smoothly increase it during 1 second from zero to normal DCC voltage. .(It very useful for layouts with a lot of powerpacked rolling stock).
2) It catch short circuit current states, allowing Viessmann Commander to continue generate DCC, and allow to switch breaked turnouts at short current state via separate Signal DCC BUS.
3) It also allows to pass turnout and signal commands at short circuit state (locomotive commands are repeated continuously , turnouts- and signal commands are single commands) Therefore all routes is fulfilling correctly. It overcomes Viessmann Commander BUG V1.35 when it try to send commands in Automatic Mode via
turned off DCC bus, when short circuit occurs.
4) It Makes S88 Freese at DCC short current, avoiding false route starting. It makes sense for current sensors without freeze input.
I make my own Current sensors with high noise immunity protection, because Viessmann 5233 have poor noise immunity protection.
These current sensors are connected to Viessmann 5217 s88 blocks.
Your Questions please.
May be this information would be helpful for somebody.