Hi Michael Hatzakis Jr<span class="gI"><span class="gD" style="color: rgb(0, 104, 28);"></span></span><br><br><div class="gmail_quote">2011/1/2 Michael Hatzakis Jr <span dir="ltr"><<a href="mailto:mail@hatzakis.net">mail@hatzakis.net</a>></span><br>
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<p class="MsoNormal"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Arnaud Quette,</span></font></p>
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<p class="MsoNormal"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">I have read in depth your page regarding APC UPS
programming. I hope you don’t mind taking a moment to assist
me. I see that Russel Kroll has long since retired. I read your APC
smart protocol page as well as that of Jjoseph, <a href="http://www.jjoseph.org/notes/apc_smartups_battery_float_voltage" target="_blank">http://www.jjoseph.org/notes/apc_smartups_battery_float_voltage</a>
regarding programming the APC SU2200 and SU1500. In particular, I
am interested in the use of the battery gain control, B + and B – commands
to reduce or increase the battery voltage by changing the gain setting.</span></font></p>
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<p class="MsoNormal"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">What is interesting to me is that in reading multiple posts
and sites, on some unit, this changes the battery control voltage and in
others, it changes only the read voltage of the A/D converter. I tried
this on my APC SU2200XL and changing the gain, actually, changed the read
voltage only, and did not change the real voltage on the output of the battery
terminals. Appears opposite what yours and Joseph’s page suggests
for the SUA1500 but similar to that of the SU700.</span></font></p>
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<p class="MsoNormal"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">My bottom line is that I need to reduce my float voltage as
it is now at 56volts, too high for a float and will ultimately damage my new
batteries. Do you have any insight on how to reduce the output voltage,
NOT, just what the unit reads? Do you have any insight on the
inconsistency of the B command on various UPS?</span></font></p>
</div></div></blockquote></div><br>I have personally no insight on these units, have never worked on this driver (apart from applying trivial patches) and have no clue on the serial protocol.<br><br>so your best bet is to subscribe to the NUT user mailing list, and start (continue!) a discussion on this topic.<br>
<br>cheers,<br clear="all">Arnaud<br>-- <br>Linux / Unix Expert R&D - Eaton - <a href="http://powerquality.eaton.com">http://powerquality.eaton.com</a><br>Network UPS Tools (NUT) Project Leader - <a href="http://www.networkupstools.org/" target="_blank">http://www.networkupstools.org/</a><br>
Debian Developer - <a href="http://www.debian.org" target="_blank">http://www.debian.org</a><br>Free Software Developer - <a href="http://arnaud.quette.free.fr/" target="_blank">http://arnaud.quette.free.fr/</a><br><br>