siemens cp340 - ringing indication

Hi all!

I have one question. How to indicate ringing (incoming call) in program in s7-300.

I am using CP 340 and siemens mc35i connected via rs-232c

I have tried to use "v24_stat" block with correct "ladd" (first adress as in hw configuration) but dont get "RI_IN" output active.

Other outputs are correct. (when i disconnect modem outputs are changed).

Does anyone have an idea or advice?

Correct (working) shematic of cable??

Please help.

problem solved!

problem was in rs232 cable... used cable does not have pin 9 connected...