MicroWin 4 SP9 installed on Windows 7 professional 64bit. Also installed on that computer TIA Portal V13. MicroWin communicates properly S7-200 with PC/PPI serial.
After upgrading TIA Portal to SP1 (V13.1) in communication settings PC / PPI cable MicroWin choice COM1 no longer appears. USB only.
I reinstall MicroWin but not fixed

Any help?

Dear Friend 

The new version PC-adapter USB2 should be connected to let you see the defined adapter ,if you remove it the definition will be disappear. 

Thanks for your suggestion, but I have no PC Adapter USB.
It is a training center and we have 15 PC / PPI serial cables.
I think I'll have to uninstall the SP1 and maintain computers as before.

New question published by miguel_lopez is split to a separate thread with the subject After updating to new TIA V13 SP1, Microwin can not communicate.

Best regards
Min_Moderator

Take a look at this post where a similar problem is fixed.

https://support.industry.siemens.com/tf/ww/en/posts/microwin-4-0-we-can-not-download-the-program-to-the-plc/134669/?page=1&pageSize=10#post542572