networking is considerably different from the old method described at the beginning of this chapter. In the old code, there is a lot of configuration on both the master and slave side, and the master polls or sends info to the slave. Using the net driver is much simpler. However, you should carefully check that the NIS slave does a proper shutdown. In the master/slave code, the master ensures the best it can that the slave is shutdown or notified before it shuts down itself. On the other hand, using the net driver, the NIS server knows nothing about the NIS slaves that may be listening and thus takes no special precautions to ensure that the NIS slaves receive the shutdown signal. Since the NIS slave reads the master’s data once per second there should be no shutdown problems, and our experience confirms this. This question can only be answered by carefully testing the shutdown.

In this NIS server/slave mode, the NIS server is a standard stand alone con- figuration except that it must have NETSERVER on in the configuration file and have an NISPORT nnn defined. Thus any apcupsd running in this mode then becomes the NIS server.

The NIS slave then uses the net driver to connect to the server’s NIS output. In this mode, the NIS slave decides how often to poll the server for the NIS information. The NIS slave’s conf file has UPSTYPE net, which will invoke the “network” driver. By setting this machine’s DEVICE to be server-ip:server-NIS-portit will automatically connect to the NIS server and use the server’s signals to shutdown the computer. In the example net slave configuration file below, the slave uses the NIS information provided by the computer tibs on port 3551.

## apcupsd.conf v1.1 ## UPSCABLE ether UPSTYPE net

#Specify the server name:port where NIS is running DEVICE tibs:3551

LOCKFILE /var/lock

BATTERYLEVEL 5 MINUTES 3

TIMEOUT 0 ANNOY 300

ANNOYDELAY 60 NOLOGON disable

EVENTSFILE /etc/apcupsd/apcupsd.events UPSCLASS standalone

UPSMODE disable

#Use this to control the poll time.

#the default is 60 or 1 minute

#

NETTIME 30

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APC UPS control system manual 107, Batterylevel 5 Minutes
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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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