w_tom

On Aug 4, 7:42 pm, AlecR <Al...@discussions.microsoft.com> wrote:
> Has anyone tried one of those cables that coverts serial to usb. If this is
> plugged into a USB port, would Vista recognise the UPS as being connected to
> USB?

UPS uses serial port status lines such as Clear to Send and Carrier
Detect to send signals to the computer. UPS is told to shutdown using
Data Terminal Ready status line. How are these handshake signals
carried on a USB port?

Obviously if not, then USB port on Vista could not see those
handshaking signals. To understand why USB converter does nothing
useful, one would understand simple serial port functions and how USB
works.