[Nut-upsuser] Can anyone give me some ideas?

[Charles Lepple]

On Nov 6, 2009, at 9:08 AM, nick wrote:

> I've got a big UPS from an italian manufacturer MSC elettronica  
> which should be megatec protocol based. They distribute it with  
> Upsilon2000, developed by Megatec, and with a cable listed on the  
> megatec site:

Which cable? M2502, M2505, or something else?

> http://www.megatec.com.tw/FAQ.htm
>
> How do I know the M2505 cable is the one that should be used on my  
> UPS instead of M2502 cable?
>
> UPS that use both these cables are TRUE RS232 UPS with MegaTec  
> protocol.  The difference is:
>
> UPS communicate with computer on pin 6.7.9 ---> M2502 cable
> UPS communicate with computer on pin 2.3.5 ---> M2505 cable

There is only one pair of data pins for a PC RS-232 port, so I assume  
that the above pin assignments refer to the UPS side of the cable.  
Does your UPS have any documentation saying which pins are TX and RX?

> UPS listed below are the ones who uses M2505 cable:
>
> Delta: GES-N
> Chroma: 91 Series
> Phoenixtec: C Series
>
>
> So, as far as I can tell, it should be using the megatec driver, but  
> I'm not sure if there's something I need to change or specify to let  
> it know  that the signaling pins are 2.3.5, or if in fact there's  
> another better adapted driver in this case?
>
> I also have a dumb port that I can fall back on, but I'd prefer a  
> bit more information if at all possible.
>
> I'm using CentOS 5.0, with nut 2.2.0, and ttyS0 is the only serial  
> port I have available on the machine.
>
> setserial -g /dev/ttyS0
> /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
>
> The cable is good and no one is using the serial port (at least I  
> never receive any indication of this).

What are you using to test the cable?

> Can anyone give me an idea of where to look or try next?

How is the driver failing?