MASTER <name of the master> for slave machines. Used in slave configuration files, this is the network name of the master which is authorized to send commands to this slave. In all cases (of which I am aware), when you specify a MASTER directive, you will also specify UPSCABLE ether since your information about the UPS will come via the network from a master.

The slave machine will be shutdown whichever occurs first: either at the request of the master when it does a shutdown or when the values you have specified for TIMEOUT, BATTERYLEVEL, or MINUTES expire (these should work but have not been fully tested). Conse- quently, if you want the slaves to begin shutting down before the mas- ter, you can do so by adjusting the values in the configuration file. If you want the slave to remain up until the master shuts down, you should set TIMEOUT, BATTERYLEVEL, and MINUTES all to zero.

For proper functioning of the slave, you must specify the same UP- STYPE in the slave configuration file as is in the master configuration file.

It should be noted that the master and slaves continue to communi- cate over the network even after the master has issued a shutdown command to the slaves. This is because the master apcupsd continues to run until it receives the shutdown signal from the system. This is important to ensure that all the slaves have been properly notified of the shutdown.

We recommend that the machine names used on the MASTER and SLAVE directives be put in your /etc/hosts file so that apcupsd will be able to resolve the machine name during startup and shutdown even if DNS is not running. Alternatively, you can use IP addresses on the MASTER and SLAVE directives, but this is less flexible.

SLAVE <name of slave(s)> used only in MASTER configuration files. Used in master configuration files, this is the name of a slave machine that depends on this master. There can be a maximum of 20 slaves attached to one master. Thus you can specify multiple SLAVE directives in a master configuration file. Only one slave name can be specified per SLAVE directive, thus for multiple slaves, specify multi- ple SLAVE directives.

As noted above the master and slaves continue to communicate over the network even after the master has issued a shutdown command to the slaves. This is because the master apcupsd continues to run until it receives the shutdown signal from the system. This is important to ensure that all the slaves have been properly notified of the shutdown.

We recommend that the machine names used on the MASTER and

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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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