COMMUNICATIONS

DB-9 Connector

The UPS has a DB-9 (9 pin female) connector on the rear to allow UPS status communications with a computer system running MultiLink™ software. The DB-9 is capable of supplying serial communication, on battery and low battery signals. MultiLink, Liebert’s UPS monitoring and shutdown software, is shipped with the UPS, along with a 10-ft.

(3m) DB-9 cable required for running MultiLink.

When MultiLink is installed on the host computer, the UPS can signal “on battery” and “low battery” using opto-couplers. When the UPS is operating in Battery mode, it can receive a signal from the host com- puter system that will shut down the UPS (after gracefully shutting down the operating system on the host computer system) when the remaining battery run time is low. The timing of the signal depends on MultiLink’s configuration settings. This shutdown signal (5-12VDC) must have a duration of at least 2 seconds for the UPS to be shut down. The UPS communicates via serial communications using Liebert ESP II protocol.

DB-9 Pin

Assignment Description

 

 

1

Low Battery (open collector)

2

UPS TxD (typical RS-232 levels)

 

 

3

UPS RxD (typical RS-232 levels)

 

 

4

Battery Mode Shutdown (5-12VDC, 10-24 mA max)

 

 

5

Common

 

 

6

Any Mode Shutdown (short to Pin 5)

 

 

7

Low Battery (open emitter)

 

 

8

Utility Fail (open emitter)

 

 

9

Utility Fail (open collector)

 

 

DB-9 Pin Assignment

Collector to Emitter*

 

6

7

8

9

(+)

Open

Collector

1

2

3 4

5

(-)

Open

 

Emitter

* Maximum voltage and current on Pins 1, 7, 8, and 9 is 55VDC; 10.0 mA.

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Liebert PSP user manual DB-9 Connector, Communications

PSP specifications

The Liebert PSP (Power Supply Panel) is a critical component designed to provide reliable power protection and support for various sensitive equipment, especially in environments like data centers and telecommunications. This device is engineered to ensure continuous operations and safeguard against electrical disturbances, making it an essential part of an uninterruptible power supply (UPS) system.

One of the main features of the Liebert PSP is its advanced power conditioning capability. The unit is equipped with technology that filters out electrical noise and voltage spikes. This results in a stable output voltage that protects connected devices from damage due to power anomalies. The device utilizes double-conversion online technology, which continuously converts incoming AC power into DC and then back to AC. This process provides a clean and consistent power supply, ideal for sensitive electronic equipment.

Additionally, the Liebert PSP features built-in battery backup, ensuring that even during power outages, connected devices remain operational. The intelligent battery management system optimizes battery performance and lifespan by managing charge cycles efficiently. The unit can accommodate various battery types, providing flexibility based on user requirements.

The design of the Liebert PSP emphasizes robust thermal management to maintain optimal operating conditions. It offers features like advanced airflow systems and temperature monitoring to prevent overheating, which can lead to equipment failure. Furthermore, it often includes user-friendly interfaces, such as LCD displays or LED indicators, for real-time monitoring of power conditions and status.

In terms of connectivity, the Liebert PSP usually comes with multiple input and output options, allowing seamless integration into existing power infrastructure. It often supports communication protocols that enable remote monitoring and management, enhancing the visibility and control over power resources.

In summary, the Liebert PSP stands out due to its combination of advanced power conditioning, reliable battery backup, effective thermal management, and user-friendly interfaces. Its design caters to the needs of critical applications, ensuring that vital systems remain operational even in the face of power disruptions. With its robust technology and thoughtful engineering, the Liebert PSP is a trusted solution for maintaining power reliability and protecting sensitive equipment in various settings.