Lonnie,

I just did some more reading on the NUT documents pages, and they have
stated the same thing you did; serial connections are flaky at best.
Manufactures are going with USB.

.....

If I am the only one, don't make anything special. I'm 31, eccentric,
and cantankerous. My habits tend to stick with something until it dies a
horrible death...

That said, for the benefit of others, I think you are headed on the
right path and for the sake of end user simplicity, as well as less
coding work for you and the other devels, stick with USB only.

~Benjamin


On Sat, 2013-12-28 at 22:50 -0500, Benjamin L. Naber wrote:
> Lonnie, et al:
> 
> I have a number of UPS units. The one on-line with my Astlinux router is
> a Liebert UPSstationGXT rated for 1kW. It has a serial port. 
> 
> My router is a Neoware CA2 that has two serial ports. I do not use
> console to access Astlinux. Never have, I've always used SSH or webGUI.
> 
> 
> 
> 
> On Sat, 2013-12-28 at 20:56 -0600, Lonnie Abelbeck wrote:
> > Benjamin,
> > 
> > Out of curiosity, which UPS do you  have ?  From the link below which NUT 
> > driver does it use ?
> > 
> > http://www.networkupstools.org/stable-hcl.html
> > 
> > I personally would not trust a USB->Serial dongle for UPS communication, 
> > but it may possibly work.  We do have CONFIG_USB_SERIAL_FTDI_SIO=m in our 
> > kernel.
> > 
> > Do you have a spare serial port other than the console port on your 
> > AstLinux hardware ?
> > 
> > Lonnie
> > 
> > 
> > 
> > On Dec 28, 2013, at 7:15 PM, Benjamin L. Naber wrote:
> > 
> > > One example is me.
> > > 
> > > The enterprise level on-line UPSs I have are serial only. I wonder if
> > > using a generic FTDI serial to USB drivers would be acceptable? 
> > > 
> > > 
> > > On Sat, 2013-12-28 at 15:36 -0600, Lonnie Abelbeck wrote:
> > >> Benjamin,
> > >> 
> > >> Well, a USB-> Serial dongle would still require the serial drivers 
> > >> within NUT, and that assumes the dongle's Linux driver properly 
> > >> supported any special RS232 pins such as DTR or CTS.  I recall old APC 
> > >> UPS's used those pins with a special serial cable.
> > >> 
> > >> My query here was to see if someone had an example where a UPS only 
> > >> supported serial communications and would like to monitor it with 
> > >> AstLinux.
> > >> 
> > >> It would seem that newer UPS's all support USB instead of Serial.  
> > >> Please correct me if I am wrong.
> > >> 
> > >> Lonnie
> > >> 
> > >> 
> > >> On Dec 28, 2013, at 1:59 PM, Benjamin L. Naber wrote:
> > >> 
> > >>> Lonnie, et al:
> > >>> 
> > >>> while serial drivers are not going to be installed, do you suppose there
> > >>> will be the option for the end user to add those specific drivers and
> > >>> alter the config files to support serial connected UPS devices?
> > >>> 
> > >>> Or, would it be considerably beneficial to for the end user to just
> > >>> obtain a serial to USB device?
> > >>> 
> > >>> ~Benjamin
> > >>> 
> > >>> 
> > >>> On Sat, 2013-12-28 at 12:57 -0600, Lonnie Abelbeck wrote:
> > >>>> The AstLinux team is working on adding NUT support for AstLinux.
> > >>>> 
> > >>>> http://www.networkupstools.org/stable-hcl.html
> > >>>> 
> > >>>> It seems NUT has improved greatly over the past few years (now 
> > >>>> supports SNMP) and the fact that apcupsd has not been updated for over 
> > >>>> 2 years, it may be wise to have an alternative plan for UPS support.
> > >>>> 
> > >>>> Question, it seems to me that supporting USB and Network connections 
> > >>>> to the UPS should be adequate.  No Serial connections.  While 
> > >>>> including Serial connection support would not be difficult, it adds a 
> > >>>> lot of extra drivers and seems of very limited value.
> > >>>> 
> > >>>> Unless there are objections, we will build NUT with the 
> > >>>> --without-serial configure option.
> > >>>> 
> > >>>> Lonnie
> > 
> > 
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