Nut upsdev - Feb 2008 - Four UPS's via usb.

> Hello everyone. I try to connect four PowerMust 2000 ups's via usb to
one
> computer using megatec_usb driver. But megatec_usb completly ignores port
> directive in ups.conf, I even try port = /dev/null and megatec_usb founds
> ups and it works.
The 'port' is not used for USB connected devices, it's only needed
for
compatibility reasons.
> Problem is that megatec_usb seen only one ups not four, and
> for four differend sections in ups.conf it uses only _one_ ups.
Apparently, the driver can't tell the different device apart through the
regular expressions that (may be missing) in 'ups.conf'.

[...]
> bus directive not work becouse i have only two buses and all ups's sits
at
> one:
> data:/etc/nut# lsusb
> Bus 002 Device 001: ID 0000:0000
> Bus 001 Device 004: ID :5161
> Bus 001 Device 005: ID 0665:5161
> Bus 001 Device 003: ID 0665:5161
> Bus 001 Device 002: ID 0665:5161
> Bus 001 Device 001: ID 0000:0000
You could change one device to another bus and would be able to support
two of these devices on the same server (but not four).
> serial directive not work becouse it 'unknown':
> data:/etc/nut# upsc ups4 ups.serial
> unknown
That is due to a limitation in the 'megatec_usb' driver. Still, the
chances are remote that your UPS'es support serial numbers. One way to
find out if it does, it by using 'lsusb -v'. Most likely, this will
reveal
that the serial numbers (if existant) are all the same. In that case, the
only remaining option is to connect all devices to a separate bus (adding
hubs won't help you here, the only way to distinguish them will be through
the bus directive in 'ups.conf').

Best regards, Arjen
-- 
Eindhoven - The Netherlands
Key fingerprint - 66 4E 03 2C 9D B5 CB 9B  7A FE 7E C1 EE 88 BC 57

On Friday 01 February 2008 09:52, Arjen de Korte wrote:
>
> The 'port' is not used for USB connected devices, it's only
needed for
> compatibility reasons.
>
>
> Apparently, the driver can't tell the different device apart through
the
> regular expressions that (may be missing) in 'ups.conf'.
>
> [...]
>
May be I need hack libusb.c to match device number instead of port (use port 
directive from config file, but specify device number instead of path to 
device port), I found that udevinfo shows bus number and device number 
(different for all devices). 

Second variant is to place lock's on devices and do not match devices that 
locked.
>
> You could change one device to another bus and would be able to support
> two of these devices on the same server (but not four).
I can't do this, after reboot I found that all devices sits on second bus 
instead of first...
>
> That is due to a limitation in the 'megatec_usb' driver. Still, the
> chances are remote that your UPS'es support serial numbers. One way to
> find out if it does, it by using 'lsusb -v'. Most likely, this will
reveal
> that the serial numbers (if existant) are all the same. In that case, the
> only remaining option is to connect all devices to a separate bus (adding
> hubs won't help you here, the only way to distinguish them will be
through
> the bus directive in 'ups.conf').
>
lsusb -v shows iSerial parameter set to zero for all devices.

In attachements You can find output of udevinfo -a --name=/dev/usb/hiddev[1-3] 
and lsusb -v

-- 
wbr, Alexander Yu. Solodukhin
ISP CrIS, Softwarium
-------------- next part --------------

Udevinfo starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/class/usb/hiddev0':
    KERNEL=="hiddev0"
    SUBSYSTEM=="usb"
    DRIVER==""
    ATTR{dev}=="180:96"

  looking at parent device
'/devices/pci0000:00/0000:00:04.0/usb2/2-1/2-1:1.0':
    KERNELS=="2-1:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usbhid"
    ATTRS{interface}=="Sample HID"
    ATTRS{modalias}=="usb:v0665p5161d0002dc00dsc00dp00ic03isc00ip00"
    ATTRS{bInterfaceProtocol}=="00"
    ATTRS{bInterfaceSubClass}=="00"
    ATTRS{bInterfaceClass}=="03"
    ATTRS{bNumEndpoints}=="01"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:04.0/usb2/2-1':
    KERNELS=="2-1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{product}=="USB to Serial"
    ATTRS{manufacturer}=="Cypress Semiconductor"
    ATTRS{quirks}=="0x0"
    ATTRS{maxchild}=="0"
    ATTRS{version}==" 1.10"
    ATTRS{devnum}=="2"
    ATTRS{busnum}=="2"
    ATTRS{speed}=="1.5"
    ATTRS{bMaxPacketSize0}=="8"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceClass}=="00"
    ATTRS{bcdDevice}=="0002"
    ATTRS{idProduct}=="5161"
    ATTRS{idVendor}=="0665"
    ATTRS{bMaxPower}=="100mA"
    ATTRS{bmAttributes}=="80"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{configuration}==""
    ATTRS{dev}=="189:129"

  looking at parent device '/devices/pci0000:00/0000:00:04.0/usb2':
    KERNELS=="usb2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{serial}=="0000:00:04.0"
    ATTRS{product}=="OHCI Host Controller"
    ATTRS{manufacturer}=="Linux 2.6.22-3-686 ohci_hcd"
    ATTRS{quirks}=="0x0"
    ATTRS{maxchild}=="10"
    ATTRS{version}==" 1.10"
    ATTRS{devnum}=="1"
    ATTRS{busnum}=="2"
    ATTRS{speed}=="12"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bcdDevice}=="0206"
    ATTRS{idProduct}=="0000"
    ATTRS{idVendor}=="0000"
    ATTRS{bMaxPower}=="  0mA"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{configuration}==""
    ATTRS{dev}=="189:128"

  looking at parent device '/devices/pci0000:00/0000:00:04.0':
    KERNELS=="0000:00:04.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="ohci_hcd"
    ATTRS{msi_bus}==""
    ATTRS{broken_parity_status}=="0"
    ATTRS{enable}=="1"
   
ATTRS{modalias}=="pci:v000010DEd000007FEsv00001565sd0000340Abc0Csc03i10"
    ATTRS{local_cpus}=="ff"
    ATTRS{irq}=="18"
    ATTRS{class}=="0x0c0310"
    ATTRS{subsystem_device}=="0x340a"
    ATTRS{subsystem_vendor}=="0x1565"
    ATTRS{device}=="0x07fe"
    ATTRS{vendor}=="0x10de"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""
    ATTRS{uevent}==""

-------------- next part --------------

Udevinfo starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/class/usb/hiddev1':
    KERNEL=="hiddev1"
    SUBSYSTEM=="usb"
    DRIVER==""
    ATTR{dev}=="180:97"

  looking at parent device
'/devices/pci0000:00/0000:00:04.0/usb2/2-2/2-2:1.0':
    KERNELS=="2-2:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usbhid"
    ATTRS{interface}=="Sample HID"
    ATTRS{modalias}=="usb:v0665p5161d0002dc00dsc00dp00ic03isc00ip00"
    ATTRS{bInterfaceProtocol}=="00"
    ATTRS{bInterfaceSubClass}=="00"
    ATTRS{bInterfaceClass}=="03"
    ATTRS{bNumEndpoints}=="01"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:04.0/usb2/2-2':
    KERNELS=="2-2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{product}=="USB to Serial"
    ATTRS{manufacturer}=="Cypress Semiconductor"
    ATTRS{quirks}=="0x0"
    ATTRS{maxchild}=="0"
    ATTRS{version}==" 1.10"
    ATTRS{devnum}=="3"
    ATTRS{busnum}=="2"
    ATTRS{speed}=="1.5"
    ATTRS{bMaxPacketSize0}=="8"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceClass}=="00"
    ATTRS{bcdDevice}=="0002"
    ATTRS{idProduct}=="5161"
    ATTRS{idVendor}=="0665"
    ATTRS{bMaxPower}=="100mA"
    ATTRS{bmAttributes}=="80"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{configuration}==""
    ATTRS{dev}=="189:130"

  looking at parent device '/devices/pci0000:00/0000:00:04.0/usb2':
    KERNELS=="usb2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{serial}=="0000:00:04.0"
    ATTRS{product}=="OHCI Host Controller"
    ATTRS{manufacturer}=="Linux 2.6.22-3-686 ohci_hcd"
    ATTRS{quirks}=="0x0"
    ATTRS{maxchild}=="10"
    ATTRS{version}==" 1.10"
    ATTRS{devnum}=="1"
    ATTRS{busnum}=="2"
    ATTRS{speed}=="12"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bcdDevice}=="0206"
    ATTRS{idProduct}=="0000"
    ATTRS{idVendor}=="0000"
    ATTRS{bMaxPower}=="  0mA"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{configuration}==""
    ATTRS{dev}=="189:128"

  looking at parent device '/devices/pci0000:00/0000:00:04.0':
    KERNELS=="0000:00:04.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="ohci_hcd"
    ATTRS{msi_bus}==""
    ATTRS{broken_parity_status}=="0"
    ATTRS{enable}=="1"
   
ATTRS{modalias}=="pci:v000010DEd000007FEsv00001565sd0000340Abc0Csc03i10"
    ATTRS{local_cpus}=="ff"
    ATTRS{irq}=="18"
    ATTRS{class}=="0x0c0310"
    ATTRS{subsystem_device}=="0x340a"
    ATTRS{subsystem_vendor}=="0x1565"
    ATTRS{device}=="0x07fe"
    ATTRS{vendor}=="0x10de"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""
    ATTRS{uevent}==""

-------------- next part --------------

Udevinfo starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/class/usb/hiddev2':
    KERNEL=="hiddev2"
    SUBSYSTEM=="usb"
    DRIVER==""
    ATTR{dev}=="180:98"

  looking at parent device
'/devices/pci0000:00/0000:00:04.0/usb2/2-3/2-3:1.0':
    KERNELS=="2-3:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usbhid"
    ATTRS{interface}=="Sample HID"
    ATTRS{modalias}=="usb:v0665p5161d0002dc00dsc00dp00ic03isc00ip00"
    ATTRS{bInterfaceProtocol}=="00"
    ATTRS{bInterfaceSubClass}=="00"
    ATTRS{bInterfaceClass}=="03"
    ATTRS{bNumEndpoints}=="01"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:04.0/usb2/2-3':
    KERNELS=="2-3"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{product}=="USB to Serial"
    ATTRS{manufacturer}=="Cypress Semiconductor"
    ATTRS{quirks}=="0x0"
    ATTRS{maxchild}=="0"
    ATTRS{version}==" 1.10"
    ATTRS{devnum}=="4"
    ATTRS{busnum}=="2"
    ATTRS{speed}=="1.5"
    ATTRS{bMaxPacketSize0}=="8"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceClass}=="00"
    ATTRS{bcdDevice}=="0002"
    ATTRS{idProduct}=="5161"
    ATTRS{idVendor}=="0665"
    ATTRS{bMaxPower}=="100mA"
    ATTRS{bmAttributes}=="80"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{configuration}==""
    ATTRS{dev}=="189:131"

  looking at parent device '/devices/pci0000:00/0000:00:04.0/usb2':
    KERNELS=="usb2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{serial}=="0000:00:04.0"
    ATTRS{product}=="OHCI Host Controller"
    ATTRS{manufacturer}=="Linux 2.6.22-3-686 ohci_hcd"
    ATTRS{quirks}=="0x0"
    ATTRS{maxchild}=="10"
    ATTRS{version}==" 1.10"
    ATTRS{devnum}=="1"
    ATTRS{busnum}=="2"
    ATTRS{speed}=="12"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bcdDevice}=="0206"
    ATTRS{idProduct}=="0000"
    ATTRS{idVendor}=="0000"
    ATTRS{bMaxPower}=="  0mA"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{configuration}==""
    ATTRS{dev}=="189:128"

  looking at parent device '/devices/pci0000:00/0000:00:04.0':
    KERNELS=="0000:00:04.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="ohci_hcd"
    ATTRS{msi_bus}==""
    ATTRS{broken_parity_status}=="0"
    ATTRS{enable}=="1"
   
ATTRS{modalias}=="pci:v000010DEd000007FEsv00001565sd0000340Abc0Csc03i10"
    ATTRS{local_cpus}=="ff"
    ATTRS{irq}=="18"
    ATTRS{class}=="0x0c0310"
    ATTRS{subsystem_device}=="0x340a"
    ATTRS{subsystem_vendor}=="0x1565"
    ATTRS{device}=="0x07fe"
    ATTRS{vendor}=="0x10de"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""
    ATTRS{uevent}==""

-------------- next part --------------

Bus 002 Device 005: ID 0665:5161  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x0665 
  idProduct          0x5161 
  bcdDevice            0.02
  iManufacturer           1 Cypress Semiconductor
  iProduct                2 USB to Serial
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           34
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          3 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              4 Sample HID
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.00
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      27
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              32
Device Status:     0x0000
  (Bus Powered)

Bus 002 Device 003: ID 0665:5161  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x0665 
  idProduct          0x5161 
  bcdDevice            0.02
  iManufacturer           1 Cypress Semiconductor
  iProduct                2 USB to Serial
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           34
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          3 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              4 Sample HID
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.00
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      27
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              32
Device Status:     0x0000
  (Bus Powered)

Bus 002 Device 002: ID 0665:5161  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x0665 
  idProduct          0x5161 
  bcdDevice            0.02
  iManufacturer           1 Cypress Semiconductor
  iProduct                2 USB to Serial
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           34
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          3 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              4 Sample HID
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.00
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      27
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              32
Device Status:     0x0000
  (Bus Powered)

Bus 002 Device 004: ID 0665:5161  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x0665 
  idProduct          0x5161 
  bcdDevice            0.02
  iManufacturer           1 Cypress Semiconductor
  iProduct                2 USB to Serial
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           34
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          3 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              4 Sample HID
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.00
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      27
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              32
Device Status:     0x0000
  (Bus Powered)

Bus 002 Device 001: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 Full speed hub
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.22-3-686 ohci_hcd
  iProduct                2 OHCI Host Controller
  iSerial                 1 0000:00:04.0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval             255
Hub Descriptor:
  bLength              11
  bDescriptorType      41
  nNbrPorts            10
  wHubCharacteristic 0x0002
    No power switching (usb 1.0)
    Ganged overcurrent protection
  bPwrOn2PwrGood        1 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00 0x00
  PortPwrCtrlMask    0xff 0xff
 Hub Port Status:
   Port 1: 0000.0303 lowspeed power enable connect
   Port 2: 0000.0303 lowspeed power enable connect
   Port 3: 0000.0303 lowspeed power enable connect
   Port 4: 0000.0303 lowspeed power enable connect
   Port 5: 0000.0100 power
   Port 6: 0000.0100 power
   Port 7: 0000.0100 power
   Port 8: 0000.0100 power
   Port 9: 0000.0100 power
   Port 10: 0000.0100 power
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled

Bus 001 Device 001: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         1 Single TT
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.22-3-686 ehci_hcd
  iProduct                2 EHCI Host Controller
  iSerial                 1 0000:00:04.1
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval              12
Hub Descriptor:
  bLength              11
  bDescriptorType      41
  nNbrPorts            10
  wHubCharacteristic 0x000a
    No power switching (usb 1.0)
    Per-port overcurrent protection
    TT think time 8 FS bits
  bPwrOn2PwrGood       10 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00 0x00
  PortPwrCtrlMask    0xff 0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
   Port 3: 0000.0100 power
   Port 4: 0000.0100 power
   Port 5: 0000.0100 power
   Port 6: 0000.0100 power
   Port 7: 0000.0100 power
   Port 8: 0000.0100 power
   Port 9: 0000.0100 power
   Port 10: 0000.0100 power
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled
-------------- next part --------------

Udevinfo starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/class/usb/hiddev3':
    KERNEL=="hiddev3"
    SUBSYSTEM=="usb"
    DRIVER==""
    ATTR{dev}=="180:99"

  looking at parent device
'/devices/pci0000:00/0000:00:04.0/usb2/2-4/2-4:1.0':
    KERNELS=="2-4:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usbhid"
    ATTRS{interface}=="Sample HID"
    ATTRS{modalias}=="usb:v0665p5161d0002dc00dsc00dp00ic03isc00ip00"
    ATTRS{bInterfaceProtocol}=="00"
    ATTRS{bInterfaceSubClass}=="00"
    ATTRS{bInterfaceClass}=="03"
    ATTRS{bNumEndpoints}=="01"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:04.0/usb2/2-4':
    KERNELS=="2-4"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{product}=="USB to Serial"
    ATTRS{manufacturer}=="Cypress Semiconductor"
    ATTRS{quirks}=="0x0"
    ATTRS{maxchild}=="0"
    ATTRS{version}==" 1.10"
    ATTRS{devnum}=="5"
    ATTRS{busnum}=="2"
    ATTRS{speed}=="1.5"
    ATTRS{bMaxPacketSize0}=="8"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceClass}=="00"
    ATTRS{bcdDevice}=="0002"
    ATTRS{idProduct}=="5161"
    ATTRS{idVendor}=="0665"
    ATTRS{bMaxPower}=="100mA"
    ATTRS{bmAttributes}=="80"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{configuration}==""
    ATTRS{dev}=="189:132"

  looking at parent device '/devices/pci0000:00/0000:00:04.0/usb2':
    KERNELS=="usb2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{serial}=="0000:00:04.0"
    ATTRS{product}=="OHCI Host Controller"
    ATTRS{manufacturer}=="Linux 2.6.22-3-686 ohci_hcd"
    ATTRS{quirks}=="0x0"
    ATTRS{maxchild}=="10"
    ATTRS{version}==" 1.10"
    ATTRS{devnum}=="1"
    ATTRS{busnum}=="2"
    ATTRS{speed}=="12"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bcdDevice}=="0206"
    ATTRS{idProduct}=="0000"
    ATTRS{idVendor}=="0000"
    ATTRS{bMaxPower}=="  0mA"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{configuration}==""
    ATTRS{dev}=="189:128"

  looking at parent device '/devices/pci0000:00/0000:00:04.0':
    KERNELS=="0000:00:04.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="ohci_hcd"
    ATTRS{msi_bus}==""
    ATTRS{broken_parity_status}=="0"
    ATTRS{enable}=="1"
   
ATTRS{modalias}=="pci:v000010DEd000007FEsv00001565sd0000340Abc0Csc03i10"
    ATTRS{local_cpus}=="ff"
    ATTRS{irq}=="18"
    ATTRS{class}=="0x0c0310"
    ATTRS{subsystem_device}=="0x340a"
    ATTRS{subsystem_vendor}=="0x1565"
    ATTRS{device}=="0x07fe"
    ATTRS{vendor}=="0x10de"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""
    ATTRS{uevent}==""

> Ok, what You can suggest to me, pci serial board and serial cables or usb
> to serial converters?
Both will work with the 'megatec' driver. I have a slight preference for
the PCI serial board, because the ports the devices are connected to are
fixed. Not only logically, but also physically (by means of screws, so the
connectors can come off by accident, which is big plus for something as
vital as the connection to a UPS).

With USB serial converters this location is not quite fixed. Ie, if one of
the devices is removed

    /dev/ttyUSB0
    /dev/ttyUSB1 <- remove this one
    /dev/ttyUSB2
    /dev/ttyUSB3

chances are that on the next reboot the list will look as follows

    /dev/ttyUSB0
    /dev/ttyUSB1
    /dev/ttyUSB2

instead of

    /dev/ttyUSB0
    <missing>
    /dev/ttyUSB2
    /dev/ttyUSB3

The above should not happen, but there is no absolute guarantee it won't.
In theory, if your converters are as broken as your UPS'es (the serial
numbers must be unique according to the USB specifications), you'd risk
that the problem is still not fixed.

Best regards, Arjen
-- 
Eindhoven - The Netherlands
Key fingerprint - 66 4E 03 2C 9D B5 CB 9B  7A FE 7E C1 EE 88 BC 57