I heed comunicate one device with protocol TTY with other device with RS232.
Somebody have documentation (speed, voltage levels, ...) about the TTY protocol?
This is Siemens s5 plc rs232-TTY connection and full tty detail.But document not english.
And please visit this site for tty.Horter.de have all shematic for 232 to tty... https://www.horter.de/sps/index.htm