Thanks to Lazar M. Fleysher, 144 | APC UPS control system manual

analysis) indicates that this cable under the right conditions may provide the Low Battery signal. This is to be conﬁrmed.

APC Part# - 940-0020B
Signal Computer			UPS
	DB9F		DB9M
CTS	8 --------------------		2	On Battery
DTR	4 --------------------		1	Kill power
GND	5 ---------------	*----	4	Ground

	---	*----	9	Common

DCD	1	----///-----------	5 Low Battery
		\\\
RTS	7	----/// (probably a
		---	semi-conductor)

Thanks to Lazar M. Fleysher.

940-0020C Cable Wiring:

This diagram is for informational purposes and may not be complete, we don’t recommend that use it to build you build one yourself. This cable can only be used on voltage-signalling UPSes, and provides the On Battery signal, the Low Battery signal as well as kill UPS power. In apcupsd versions

3.8.2and prior, please set your UPSCABLE to 940-0020B. In version 3.8.3 and later, you may specify the cable as 940-0020C. Please note that this diagram may not be accurate.

APC Part# - 940-0020C
Signal Computer			UPS
	DB9F		DB9M
CTS	8 --------------------		2	On Battery
DTR	4 --------------------		1	Kill power
GND	5 ---------------	*----	4	Ground

		*----	9	Common
RTS	7 -----	[ 93.5K ohm ]-----	5	Low Battery
		or semi-conductor

144 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.

APC UPS control system manual Thanks to Lazar M. Fleysher, 940-0020C Cable Wiring, 144

Models: UPS control system

Thanks to Lazar M. Fleysher.

940-0020C Cable Wiring:

144

UPS control system specifications