Hi Milan Sir. Well, the schematic of the cable shown bellow on the links should work at least perfectly.

Zanor ther are two problem picture three. 1- max 232 power pin (16 food) no (+) power you mut give (+) power this point 2- 75176 power pin is empty you must give (+) power this point. Excuse me my english not good if you want I can send email picture 3 I have got s7 200 22cpu and it is working good this cable see you next Love from Turkey Thank you for replying! My + pins are OK. But should the RX LED always be on? It goes off if I remove the 75176 from it's socket. And also the error msg goes away if I remove the 75176 IC, but then of course I get a timeout when trying to communicate with my PLC:P I found that my 75176 IC may be broken, because when it's not connected to the PCB I get 15 OHm between pin 5 and 6.

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This can't be normal or is it? Could you please measure your's? BTW, I also have the S7 200 222CPU. Zanor I first made this circuit Rx and Tx led always on and there were comunication fals after I made again connect 232 16.pin (+) and 75176 8. Pin (+) Tx and Rx led only on as fliflop when knowledge flov (232 IC 15.pin gnd and 75176 5.pin gnd Pc connector 5.pin gnd) all of them must be my email please send me email adress I will send you my change on board I have got s7 200 222 (DCDCDC and DCDCRLY)cpu and it is working good this cable see you Added after 20 minutes: Hii Ic pins max 232 1 o U o 16 (+) 2 o o 15 gnd 3 o o 14... 75176 1 o U o 8 (+) 2 o o 7 3 o o 6 4 o o 5 gnd.