On Mon, 07 Mar 2005 00:41:06 +0000, Martin 53N 1W wrote:

reverend maxwell snort wrote:

On Sun, 06 Mar 2005 22:55:36 +0000, SoT wrote:

[...]

yes; ups's typically use a non-standard cable to attach to the serial
port. available only from the manufacturer.  won't adapt to USB.

Worse still, some UPS's use the serial port in a non-standard 
pseudo-parallel port way to play tricks. This requires the 
manufacturer's proprietary driver and direct access to the port for it 
to work.

Silly stuff.

Regards,
Martin

yes; they use a 9 pin, and tie txd/rxd straight (2-2, 3-3), not crossed
(2-3, 3-2); then use DSR/DTR on 5 and 6 to control the data in a
synchronous fashion. they're trying to make a 9 pin serial work like a 25
pin DTE-DTE drag queen configuration.  it's disturbing.