Thank you for your reply Charles.
First you are correct in both assumptions, my microprocessor does provide the
voltages and my table listing Pin 9 should read Pin 8.
I spent some time reading and thinking about your email and realized that
normal (AC present, battery normal) is at -12V which is a logic low.
I thought this was how I designed it but when I got funny results I convinced
myself that it was +12V.
Moving on, I have never heard of statserial but I found it on the install CD
and tried it out and it is a wonderful tool that I won't forget.
Setting the switches for -12V provided normal operation of logic 0 and flipping
either pin 1 or pin 8 caused that signal to change to a 1.
HOWEVER, flipping both to +12V caused both lines to show 0 again?
The only possible way for this is if the ground pin 5 was broken. I moved the
ground wire of my simple jig from pin 5 and connected it to a metal point on
the server (which I figured was ground) and eureka!
I exited out of statserial, started up nut and this time setting both lines to
+12V caused the servers to shut down as expected.
So, pin 5 (ground) is broken somewhere which I confirmed with my meter so
tonight I will have to disassemble this server and fix the ground issue.
Thank you for your help, I am eager to fix this and get things back to normal.
Sincerely,
Steve
________________________________
From: Charles Lepple <[email protected]>
To: Steve Read <[email protected]>
Cc: "[email protected] List"
<[email protected]>
Sent: Sunday, February 26, 2012 5:55 PMbrocken
Subject: Re: [Nut-upsuser] Server Does Not Shut Down
On Feb 26, 2012, at 3:14 PM, Steve Read wrote:
> I made a simple device to apply either +12 or -12volts to both pin 1(DCD) and
> pin 8 (CTS) to help me understand the correct handshake but I am very
> confused.
>
> Here is a table of what I get:
>
> State Pin 1 Pin 9 Note What I understand it means
> 1 +12V +12V OL On Line - normal operation.
> 2 -12V +12V LB OL I don't understand this. It should be
> On Battery.
> 3 +12V -12V OB I thought this should be Low Battery.
> 4 -12V -12V OL I thought the server should shut down?
>
> Note: results of running:
> /usr/local/ups/bin/upsc sdrups@localhost ups.status
For reference, here is the block for type=9 in genericups.h:
/* Type 9 */
{ "APC",
"Back-UPS",
"APC Back-UPS (940-0023A cable)",
0, /* cable power: none */
TIOCM_CD, 0, /* online: CD off */
TIOCM_CTS, TIOCM_CTS, /* low battery: CTS on */
TIOCM_RTS /* shutdown: RTS */
},
And the text from the genericups man page:
- - - - - - - - - -
9 = APC Back-UPS/Back-UPS Pro/Smart-UPS with 940-0023A cable
[CP=none] [OL=-DCD] [LB=CTS] [SD=RTS]
- - - - - - - - - -
For your tests where you apply voltage directly, CP is not relevant. (I assume
your microcontroller provides its own power to the serial port control lines.)
Also, SD=RTS is the shutdown signal *to* the UPS (saying that NUT acknowledges
the UPS' low battery condition). But you mentioned pins 1 (DCD) and 8 (CTS), so
we can ignore that for now.
The way I read this, online with a good battery should be negative voltages on
both DCD and CTS. OB+LB should be positive voltages on both. On Battery (but
not yet low) should be DCD high, CTS low. (The fourth condition could occur if
the power has returned, but the battery has not yet charged.)
I am confused as to how you could get OL for both +/+ and -/- states. Your
table says Pin 1 and Pin 9, but earlier you mention Pin 1 and Pin 8. Could pin
8 have been floating during the voltage test?
You can use statserial to double-check that your serial port hardware is still
good.
--
Charles Lepple
clepple@gmail_______________________________________________
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