Checking Out Your USB Subsystem

You can skip this section if your UPS has an Ethernet or RS232-C interface or you are not running on a Linux kernel. If it has a USB interface, you need to make sure that your USB subsystem can see the UPS. On a Linux system this is easy, just do this from a shell prompt (please see below for

2.6 kernel considerations):

Most of this section applies to Linux. However, toward the end, there is critical information about the BSD USB driver, including a list of known issues and kernel configuration requirements.

cat /proc/bus/usb/devices

This information is updated by the kernel whenever a device is plugged in or unplugged, irrespective of whether apcupsd is run-

ning or not. To interpret the codes in this file, please see http://www.linuxhq.com/kernel/v2.4/doc/usb/proc usb info.txt.html

You should get some output back that includes something like this from ESR’s site, featuring an RS 1000:

T:Bus=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 3 Spd=1.5 MxCh= 0

D:Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1

P:Vendor=051d ProdID=0002 Rev= 1.06

S:Manufacturer=American Power Conversion

S:Product=Back-UPS RS 1000 FW:7.g3 .D USB FW:g3

S:SerialNumber=JB0308036505

C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr= 24mA

I:If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=hid

Note, if on the last line, Driver is listed as Driver=none then you do not have the HID driver loaded or the driver did not attach to the UPS. One common cause is having a Linux kernel older than 2.4.22 (such as a stock RedHat 9 kernel). If this is the case for your system, please upgrade to at least kernel version 2.4.22 and try again. Otherwise, please read further for instructions for other possible courses of action.

For more details on how to interpret these codes, please see the end of this section.

Here are two more ample entries from Kern Sibbald. The first features a Back-UPS 350 direct connected USB device:

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APC UPS control system manual Checking Out Your USB Subsystem
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UPS control system specifications

APC UPS (Uninterruptible Power Supply) control systems are vital components for ensuring uninterrupted power supply and protecting critical equipment from power interruptions, surges, or fluctuations. Designed by Schneider Electric, APC UPS systems are renowned for their high quality and reliability. They utilize advanced technologies and features to suit diverse applications, from home offices to large industrial settings.

One of the main features of APC UPS systems is the ability to provide backup power during outages. This is achieved through a battery system that activates immediately when the mains power fails. This seamless transition minimizes downtime and ensures that electronic devices continue to operate, protecting data integrity and equipment lifespan.

Another significant characteristic of APC UPS systems is their intelligent management capabilities. Most models come with PowerChute software, which provides users with real-time monitoring of power conditions and the status of the UPS. This software allows for graceful shutdowns of connected devices during extended outages, thereby preventing data loss and damage to devices.

APC UPS systems also incorporate advanced technologies such as Automatic Voltage Regulation (AVR). AVR technology ensures that the output voltage remains stable by correcting minor fluctuations without switching to battery mode. This not only prolongs the battery life but also provides a consistent power supply to the connected equipment.

Thermal management is another critical aspect of APC UPS control systems. The design often includes efficient cooling systems that prevent overheating, ensuring optimal performance and longevity of the unit. Some models feature EcoMode, which reduces energy consumption and lowers operational costs by working at high efficiency only when battery backup is not required.

APC UPS systems are designed with scalability in mind. Users can easily add more batteries or connect additional UPS units to accommodate growing power needs. Features such as hot-swappable batteries and modular design facilitate easy upgrades and servicing without interrupting power supply.

In terms of connectivity, APC UPS products often feature multiple options including USB, RS-232, and network management capabilities. This enables users to connect remote management tools and integrate the UPS with existing IT infrastructure.

In summary, APC UPS control systems deliver reliability, efficiency, and advanced technology features that cater to a wide array of power protection needs, making them a trusted choice for individuals and businesses alike.
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