ENERGIZERUPS(8)

NAME
energizerups - Driver for Energizer (Megatec protocol over "USB To RS232 Interface (V1.0) BaudRate 2400bps") UPS equipment

NOTE
This man page only documents the hardware-specific features of the energizerups driver. For information about the core driver, see nutupsdrv(8).

SUPPORTED HARDWARE
energizerups supports Energizer models such as the ER-HMOF600 and ER-OF800. At the time of this writing, the driver was tested only with these two models. Other Energizer models that use the same USB interface should also work, but they have not been tested for compatibility.

PREREQUISITES
This driver is Linux-specific. It is not designed to work on other operating systems. In order for this driver to work, USB and HID support must be present on your system. As a minimum, this means that the following kernel drivers must be loaded:
    hid
    usb-uhci
    usbcore
In place of usb-uhci, you may have another host controller module loaded, as appropriate for your hardware. In version 2.4.21 and possibly other versions of the Linux kernel, the hiddev driver refuses to take control of HID devices that are also recognized as input peripherals. Unfortunately, this also applies to these Energizer UPS models. One solution to this problem is to compile a kernel with the CONFIG_HID_USBINPUT option turned off. An alternative is to modify the kernel with a simple patch. In drivers/usb/hiddev.c, in the function hiddev_connect(), the line
    if (!IS_INPUT_APPLICATION(hid->application[i]))
must be removed or commented out, and the driver and/or the kernel must be recompiled. energizerups also requires that device nodes for the UPS HID device be created. If these don't exist on your system, you can create them using the following commands:
    mkdir /dev/usb
    mkdir /dev/usb/hid
    mknod /dev/usb/hid/hiddev0 c 180 96
    mknod /dev/usb/hid/hiddev1 c 180 97
    mknod /dev/usb/hid/hiddev2 c 180 98
    mknod /dev/usb/hid/hiddev3 c 180 99
If your system uses the devfs file system, the appropriate node may be created automatically by the system when the UPS is connected.

CHECKING THE HARDWARE
You can verify that the UPS is connected and recognized by your system by mounting the usbfs file system (if it is not mounted already) and then listing all USB devices:
    mount none /proc/bus/usb -t usbfs
    cat /proc/bus/usb/devices
In this file, the following line should be seen: S: Product=USB To RS232 Interface (V1.0) BaudRate 2400bps This line indicates the presence of the USB-to-serial converter that is used by these Energizer UPS models.

EXTRA ARGUMENTS
This driver does not support any extra settings in the ups.conf(5).

BUGS
The battery percentage is derived from the voltage data that the UPS returns, since the UPS doesn't return that value directly. On some hardware, the charge will remain at 100% for a long time and then drops quickly shortly before the battery runs out. You can confirm from the battery.voltage readings that this is a problem with the UPS and not this driver. Voltage/charge characteristics are derived from a manual calibration with an ER-HMOF600. Due to hardware differences, the charge percentage reports may be very inaccurate. Dead/broken batteries can't be reported reliably. If your UPS kills the load instantly or within seconds of starting the inverter, your batteries probably need to be replaced.

AUTHOR
Viktor Toth (http://www.vttoth.com/)

SEE ALSO

  The core driver:
nutupsdrv(8)

  Internet resources:
The NUT (Network UPS Tools) home page: http://www.networkupstools.org/