port), which is called the master, can provide information to other machines powered by the UPS, called slaves. When the master detects a power failure, it will notify all the slaves (maximum of twenty). If the master detects that the battery is low, it will also notify the slave so that the slave may perform a shutdown.

In addition, in cases where you wish to keep the master up longer than the slave, you can configure the slave to shut down in a predetermined time after the UPS goes on batteries.

If a picture is worth a thousand words for you, please see Configuration types..

Configuration Directives

If you are setting up a master/slave configuration, you will be required to make some modifications to the apcupsd.conf files after the build is done.

The minimum set of configuration directive changes needed to cre- ate a proper master and slave configuration files is described in the Configuration Examples section of this manual.

The details of these directives are explained in the Configuration Directives for Sharing a UPS section of the Configura- tion chapter of this document.

In addition, sample master and slave configuration files can be found in the <src>/examples directory (apcupsd.master.conf and apcupsd.slave.conf).

Master/Slave Problems

Master/Slave Shutdown:

For additional details of shutting down a master/slave configuration, please see the Master/Slave Shutdown section of the Shutdown chapter (see Shutdown Sequence <1>) of the Technical Reference.

Server/Slave Networking using NIS and the NET Driver:

It is also possible to implement a network of NIS server/slave apcupsds using the new 3.10.x code and the net driver. This mode of NIS server/slave

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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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