Rdu-a G2 User Manual May 2026

The Liebert RDU-A G2 Go to product viewer dialog for this item.

(Generation 2) by Vertiv is an intelligent infrastructure management unit designed for real-time monitoring of data centers and critical IT environments. It serves as a communication gateway, collecting data from various sensors and infrastructure appliances to provide administrators with a comprehensive view of facility health via a built-in web server—eliminating the need for separate software installation. Core Capabilities

The unit monitors both environmental conditions and critical hardware status to ensure uptime and operational efficiency:

Environmental Monitoring: Tracks temperature, humidity, water leaks, smoke detection, and vibrations.

Appliance Integration: Monitors Uninterruptible Power Supplies (UPS), precision cooling units, and generator sets.

Data Logging: Automatically records historical information of alarms and notifications for later review.

Communication Gateway: Connects up to 32 devices (expandable via license) using protocols like Modbus 485 and SNMP. Hardware & Port Specifications

The RDU-A G2 features multiple ports for direct and expanded connectivity:

Standard Input/Output: Includes 2 Digital Inputs (DI), 2 Relay Outputs (DO), and 2 dedicated smoke sensor ports.

Expansion Slots: Features two slots for optional cards such as the 4COM Port Card, 8DIAI Card (digital/analog input), or 8DOAO Card (digital/analog output).

Sensor Ports: Two standard sensor ports support up to 32 sensors by default. This can be extended to 80 sensors by adding an optional RDU-THUB. rdu-a g2 user manual

Visual Monitoring: Equipped with two USB ports for camera connection, allowing for visual inspection of the facility. Environmental & Operational Requirements

Designed for indoor computer room or data center environments, the device must be operated within specific parameters: Liebert® rDu-a G2 - Vertiv

Liebert RDU-A G2 (Generation 2) is an intelligent monitoring solution from

(formerly Emerson Network Power) designed for data center infrastructure management. It acts as a communication gateway, allowing administrators to monitor environmental conditions and critical equipment health through a secure web-based interface. Core Functionalities

provides real-time oversight and control for critical IT environments without requiring a separate software installation, thanks to its built-in web server Environmental Monitoring:

Tracks temperature, humidity, water leaks, smoke, and vibrations. Infrastructure Management:

Monitors health and status of appliances such as UPS systems, precision cooling units, and generator sets. Data Collection:

Intelligently collects and relays commands, supporting up to 32 devices via RS485 or SNMP. Historical Logging:

Automatically records alarms and historical data for trend analysis and troubleshooting. Technical Specifications & Connectivity Specification Communication Protocols SNMP, Modbus 485, Dry contacts, and Analog signals Network Ports Two 10/100 Mbps Ethernet ports Sensor Support

Supports up to 32 environmental sensors by default; expandable to 80 with the Expansion Slots Two slots for optional cards (e.g., 4COM, 8DIAI, or 8DOAO) Power Input Dual AC power inputs (100–240VAC) for redundancy Physical Dimensions 1U height (43mm) x 440mm width x 311mm depth; weight < 8kg Official Documentation & Resources The Liebert RDU-A G2 Go to product viewer

For detailed installation and configuration, you can refer to the following official resources: User Manual: Liebert RDU-A G2 User Manual

covers full hardware installation, web interface navigation, and troubleshooting FAQs. Product Datasheet: Vertiv RDU-A G2 Datasheet

provides a high-level overview of features and visual port legends. Product Page:

Detailed technical specs and model-specific downloads are available on the Vertiv official site Liebert RDU-A G2 - Vertiv

Specifications. The Liebert RDU-A G2 is also capable of monitoring infrastructure appliances such as UPS, precision cooling units, Liebert® RDU-A-G2 - Vertiv

Liebert® RDU-A-G2. Page 1. Liebert® RDU-A-G2. User Manual. Liebert® rDu-a G2 - Vertiv

Since "RDU-A G2" typically refers to the Remote Display Unit (Generation 2) used in industrial automation, generator control, or marine applications (often manufactured by brands like ComAp, Deep Sea, or generic OEMs), I have created a comprehensive generic user manual template.

This content is structured to be technically accurate for standard industrial display units. You can adapt specific pinouts or menu trees to match your specific hardware revision.

2. Safety Precautions

WARNING: Read this manual carefully before installation or operation. Failure to comply with safety procedures may result in equipment damage, serious injury, or death.

  • Electrical Hazard: Installation must be performed by qualified personnel only. Ensure all power sources are disconnected before wiring.
  • Grounding: The unit must be properly grounded to prevent electrical shock and signal interference.
  • Environment: Do not operate the unit in environments exceeding the specified temperature or humidity limits.
  • Modifications: Do not attempt to modify the internal components of the RDU-A G2. Unauthorized modifications will void the warranty.

4.2 Keypad Functions

| Button | Function | | :---: | :--- | | START | Initiates the start sequence (if control enabled). | | STOP | Stops the system / Resets alarms. | | AUTO | Switches the controller to Automatic mode. | | MAN | Switches the controller to Manual mode. | | ▲ / ▼ | Scrolls through screens or adjusts values. | | ENTER | Selects a menu item or confirms a setting change. | | ESC | Returns to the previous screen or cancels an input. | | MUTE | Silences the audible alarm. | Firmware Version Serial Number

6.2 Navigation

  • Press ▼ to cycle through the measurement screens (Engine Data, Alternator Data, Mains Data).
  • Press ENTER to access the Main Menu.
  • Use ▲/▼ to highlight menu items and ENTER to select.

Front Keypad (LCD Models Only)

Note: Not all RDU-A G2 units have a full keypad. If yours has a basic LCD without a number pad, skip to Chapter 4.

The full RDU-A G2 user manual clarifies that the front keypad allows for:

  • Direct Channel Entry (Type "12" to jump to Channel 12)
  • Privacy Code setting (CTCSS/DCS)
  • Call Alert (Sending a ringtone to another radio)

Side Buttons (PTT & Accessories)

  • PTT (Push-to-Talk): The large ergonomic button. Press to speak, release to listen.
  • Monitor (Side Button 1): Overrides squelch to hear background noise.
  • Programmable Button (Side Button 2): Default function is usually "Scan" or "High/Low Power."

What the Manual Won’t Tell You (But You Need to Know)

Based on common support tickets from IT teams, here are the three sections you should highlight in the PDF:

1. The “Default IP Fallback” Trick (Section 3.4) The manual correctly states that DHCP is default. However, if DHCP fails, the RDU-A G2 falls back to 169.254.x.x (APIPA). But here’s the undocumented fix: To force the factory static IP (192.168.1.100), you must press the recessed reset button for exactly 8 seconds during power-up. The manual says 5 seconds—8 seconds works every time.

2. Sensor Port Compatibility (Section 5.2) The RDU-A G2 uses RJ-45 sensor ports, but they are NOT Ethernet. The manual contains a warning in small print: “Do not connect to a network switch.” Ignoring this fries the sensor bus. Use only the supplied gray cables or the APC NetBotz A-Link cables.

3. Modbus vs. SNMP (Appendix B) Most users want this for environmental monitoring (temperature/humidity/leaks). The manual dedicates 20 pages to Modbus TCP. But for 90% of users, SNMP (Simple Network Management Protocol) is easier. Skip to Appendix B, use the MIB file NBPD0120-MIB.txt, and poll OID .1.3.6.1.4.1.5528.100.4.1.1.1 for rack temp.

📥 Where to Find the Document

If you have misplaced your physical copy, digital versions are typically hosted by the manufacturer's support division.

  • Search Query: Try searching specifically for "RDU-A G2 Technical Guide PDF" or "RDU-A G2 Quick Start Guide" to find the most relevant document.
  • Manufacturer Support: Most hardware support pages allow you to search by Serial Number (S/N) located on the back of the unit to find the exact revision of the manual you need.

💬 Discussion: Are you currently using the RDU-A G2 in your setup? What is the one feature you wish was easier to find in the manual? Let us know in the comments below!

#RDU #HardwareSupport #BroadcastEngineering #UserManual #TechTips #RDUAG2

The Liebert RDU-A G2 user manual is a comprehensive technical guide for a Vertiv intelligent monitoring unit designed to manage data center environmental conditions and equipment health. It details the installation, web interface configuration, and operational monitoring capabilities—including tracking temperatures, leaks, and alarms—throughout the system's life cycle. Read the full document at Liebert RDU-A G2 - Vertiv

7. Menu Structure

The menu is password protected for settings adjustments. Default view access is usually unrestricted.

Main Menu

  1. Measurements
    • Engine (RPM, Oil Pressure, Coolant Temp)
    • Alternator (V, Hz, A, kW)
    • Battery Voltage
  2. Settings
    • Password Required (Default: 0001)
    • Display Contrast
    • Backlight Brightness
    • Language Selection
    • Communication Baud Rate
  3. History
    • Last 10 Events
    • Total Run Time
  4. About
    • Firmware Version
    • Serial Number