What is the BAX-R4UA?

The BAX-R4UA is a 4U industrial rackmount chassis (ordering code BCC-CASE-R4UA-01R) — a barebone enclosure designed to house Avalue or standard ATX/industrial motherboards, providing cooling, power, expansion, and serviceability for rackmounted industrial computers.

Does the BAX-R4UA include a motherboard or CPU?

No. It is a barebone chassis; the processor, chipset, memory, and I/O depend entirely on the motherboard the integrator installs. The chassis supplies the mechanical, thermal, and power infrastructure.

What expansion does the BAX-R4UA support?

It supports one full-height PCIe slot via a riser card, allowing add-in cards within the 4U form factor.

What cooling does the BAX-R4UA provide?

It uses a three-fan layout: one 120mm front fan and two 80mm rear fans, with hardware fan-speed control and CPU temperature/voltage monitoring.

What power supply does the BAX-R4UA use?

It accommodates a PS2 ATX PSU, the standard form factor for ATX/industrial motherboards in rackmount builds.

What are the dimensions and weight of the BAX-R4UA?

The chassis measures 450 (D) x 430 (W) x 177 (H) mm and weighs 11.4 kg net (chassis only, without motherboard or drives).

What front I/O and controls does the BAX-R4UA have?

The front panel provides 2 x USB 2.0, power and reset buttons, and status LEDs for power, HDD activity, and keyboard lock.

What are the environmental limits of the BAX-R4UA?

It operates from 0°C to 40°C, stores from -20°C to 75°C, and tolerates 0–90% non-condensing humidity — suitable for server rooms and industrial racks.

Is the BAX-R4UA a standard 19-inch rack chassis?

Yes, it is a 4U industrial rackmount chassis designed for standard 19-inch racks, ideal for control rooms, data closets, and industrial server installations.

What applications is the BAX-R4UA best suited for?

As a 4U barebone, it suits building rackmounted industrial servers, control-room computers, edge servers, machine-vision hosts, and any application needing a robust, expandable rack enclosure around a chosen motherboard.

How long is the warranty period for rackmount systems?

TSL Automation provides a standard 2-year warranty on all rackmount systems, with options for extended warranty coverage. The warranty covers manufacturing defects and hardware failures under normal operating conditions as specified in the product documentation.

Avalue · Computing System

BAX-R4UA

Data Sheet

*Price on request. Contact us for a quote.

Manufacturer: Avalue

Highlights

4U industrial rackmount chassis (barebone — motherboard-dependent)
Accepts ATX / industrial motherboards (CPU, chipset, memory per MB)
1 x full-height PCIe slot via riser card
Hardware monitor: CPU temperature, voltages, fan speed
Watchdog timer (H/W reset)
Front: 2 x USB 2.0, power & reset buttons, status LEDs
Cooling: 1 x 120mm front fan + 2 x 80mm rear fans
PS2 ATX PSU
450 x 430 x 177 mm, 11.4 kg (chassis only)

Product Description

The Avalue BAX-R4UA is a 4U industrial rackmount chassis (ordering code BCC-CASE-R4UA-01R) engineered as a flexible barebone enclosure for Avalue and standard ATX/industrial motherboards.

Processor, chipset, memory and I/O are determined by the installed motherboard, while the chassis itself provides robust thermal management, expansion, and serviceability for data-center, control-room, and industrial server deployments.

It supports a full-height PCIe slot via riser card, integrated hardware monitoring (CPU temperature, voltages, fan speed) and watchdog, front USB and power/reset controls with status LEDs, and a three-fan cooling layout (1 x 120mm front, 2 x 80mm rear) powered by a PS2 ATX PSU.

With a 450 x 430 x 177 mm steel chassis weighing 11.4 kg, the BAX-R4UA is a dependable 4U platform for building rackmounted industrial computers.

Technical Specifications

Processor

Depend on MB

Platform Controller Hub

Depend on MB

System Memory

Depend on MB

I/O Chipset

Depend on MB

Watchdog Timer

H/W Reset, 1sec. ~ 65535sec./min.1sec. or 1min. step

H/W Status Monitor

CPU temperature monitoring

Voltages monitoring

CPU fan speed control

PCIe

1 x Full height PCIe slot (via riser card)

USB

2 x USB 2.0

Power Button

1 x Power Button

Reset Button

1 x Reset button

LED Indicator

1 x Power status, 1 x HDD, 1 x KB-Lock

System Fan

Front: 1 x 12025S

Rear: 2 x 8025S

Power Supply Unit

PS2 ATX PSU

Operating Temp.

0°C ~ 40°C (32°F ~ 104°F)

Storage Temp.

20°C ~ 75°C (-4°F ~ 167°F)

Operating Humidity

0% ~ 90% Relative Humidity, Non-condensing

Dimension (W x L x H)

450 (D) x 430 (W) x 177 (H) mm

Weight

11.4kg (Net weight, chassis only)

Ordering Information

BCC-CASE-R4UA-01R：4U Rackmount Chassis

What is BAX-R4UA?

The BAX-R4UA is a computing system manufactured by Avalue, designed specifically for rackmount-system applications. The Avalue BAX-R4UA is a 4U industrial rackmount chassis (ordering code BCC-CASE-R4UA-01R) engineered as a flexible barebone enclosure for Avalue and standard ATX/industrial motherboards. Processor, chipset, memory and I/O are determined by the installed motherboard, while the chassis itself provides robust thermal management, expansion, and serviceability for data-center, control-room, and industrial server deployments. It supports a full-height PCIe slot via riser card, integrated hardware monitoring (CPU temperature, voltages, fan speed) and watchdog, front USB and power/reset controls with status LEDs, and a three-fan cooling layout (1 x 120mm front, 2 x 80mm rear) powered by a PS2 ATX PSU. With a 450 x 430 x 177 mm steel chassis weighing 11.4 kg, the BAX-R4UA is a dependable 4U platform for building rackmounted industrial computers.

Key Features & Benefits

4U industrial rackmount chassis (barebone — motherboard-dependent)
Accepts ATX / industrial motherboards (CPU, chipset, memory per MB)
1 x full-height PCIe slot via riser card
Hardware monitor: CPU temperature, voltages, fan speed
Watchdog timer (H/W reset)
Front: 2 x USB 2.0, power & reset buttons, status LEDs
Cooling: 1 x 120mm front fan + 2 x 80mm rear fans
PS2 ATX PSU
450 x 430 x 177 mm, 11.4 kg (chassis only)

Applications & Use Cases

The BAX-R4UA is ideal for various industrial automation applications:

DC-powered industrial installations and mobile applications
Extreme temperature environments and outdoor installations
High-performance computing and data processing tasks
Peripheral device connectivity and data transfer
Memory-intensive applications and multitasking
Visual monitoring and data display systems
Industrial computing and data processing
Edge computing and IoT applications

Frequently Asked Questions

A rackmount system is a computer chassis designed to be installed in a standard 19-inch equipment rack. In industrial environments, rackmount systems are typically used for server applications, data processing, central control systems, and other computing tasks where standardized rack installation, density, and serviceability are important. They're commonly deployed in data centers, control rooms, telecommunications facilities, and industrial automation environments.

Rackmount systems offer several advantages: standardized dimensions for easy integration into 19-inch racks; efficient use of vertical space measured in rack units (U); better organization of multiple systems; improved cooling through front-to-back airflow design; easier serviceability with slide rail mounting; centralized power management; better cable management; and physical security when installed in locked racks.

The U in 1U, 2U, and 4U refers to rack units, where 1U equals 1.75 inches (44.45mm) of vertical rack space. A 1U system is the most compact with limited internal space but maximum rack density. 2U systems provide more internal space for expansion cards and storage while still maintaining good density. 4U systems offer extensive internal space for numerous storage drives, full-height expansion cards, and often better cooling, but take up more rack space.

ATX (Advanced Technology eXtended) is a standard motherboard form factor measuring 12" x 9.6" (305mm x 244mm). It's important for rackmount systems because it's widely used in the industry, offers good component layout with standardized I/O shield positioning, supports multiple expansion slots, and provides compatibility with a wide range of processors, chipsets, and RAM configurations. This standardization ensures that rackmount chassis can accommodate a variety of motherboards from different manufacturers.

Cooling is critical for rackmount systems due to the confined space. Key considerations include: maintaining proper front-to-back airflow; using multiple system fans to create positive pressure; ensuring adequate ventilation around hard drives; implementing fan speed control based on temperature monitoring; leaving appropriate space between rack-mounted equipment; and considering ambient temperature in the rack environment. Higher U systems (2U, 4U) typically offer better cooling options than 1U systems.

Watchdog timers are hardware circuits that monitor system operation and trigger a reset if the system hangs or becomes unresponsive. In rackmount servers that often run critical applications, watchdog timers help ensure continuous operation by automatically recovering from software failures without human intervention, minimizing downtime in mission-critical environments where systems may be remotely located or difficult to access physically.

Key power considerations for rackmount systems include: proper power supply wattage rating for the component load; AC input voltage range compatibility (100-240V); power supply efficiency certification; potential need for redundant power supplies in critical applications; power factor correction; surge and spike protection; adequate circuit capacity in the rack environment; and consideration of uninterruptible power supply (UPS) integration for protection against power outages.

To install rackmount systems, you typically need: rack rails or slide rails that match the specific chassis model; cage nuts and screws that fit your rack's mounting holes (square, round, or threaded); cable management accessories; proper tools like a Phillips screwdriver and cage nut insertion tool; and potentially rack shelves for supporting equipment without rail mounting capabilities. Always verify rail compatibility with both your chassis and rack type before installation.

Best practices for installing drives include: powering off the system completely; using proper anti-static precautions; selecting the appropriate drive bays for your configuration; properly securing drives with all screws to prevent vibration; routing SATA/SAS cables neatly to avoid airflow obstruction; properly connecting power cables; considering drive temperature zones (not placing all high-activity drives adjacent); and documenting drive locations if implementing RAID or multiple storage volumes.

To properly install a rackmount system: first install cage nuts in the appropriate rack locations; attach inner rail sections to the chassis if using slide rails; mount outer rail sections to the rack; slide the chassis into the rails; secure the chassis front to the rack using appropriate screws; connect power and network cables with proper strain relief; implement appropriate cable management; and ensure adequate spacing between systems for proper airflow and heat dissipation.

When cabling rackmount systems: use appropriate length cables to avoid excess loops; implement proper cable management using velcro ties or cable management arms; maintain separation between power and data cables to reduce interference; label all cables clearly for future identification; leave sufficient service loops for maintenance access; ensure cables don't obstruct airflow paths or fan operation; use appropriate cable types for the application (plenum-rated where required); and document cable connections thoroughly.

If a rackmount system doesn't power on: verify AC power to the rack is present; check power cable connections to the chassis; verify power supply switch is in the ON position; check if any circuit breakers have tripped; try a different power outlet; test with a known working power cable; check if the power supply fan spins briefly at power-on attempt; verify internal connections to the motherboard; and check for any motherboard LEDs that might indicate a power issue.

To diagnose overheating: check system temperature readings in the BIOS or through management software; verify all fans are operational and spinning at appropriate speeds; check for dust buildup on fans and heatsinks; ensure chassis vents are not blocked; check for proper front-to-back airflow; verify ambient temperature in the rack environment is within specifications; check that expansion cards or cables aren't blocking airflow; and consider monitoring software that logs temperature data over time to identify patterns.

For unexpected shutdowns: check system logs for error messages or thermal events; monitor power supply voltages through BIOS or monitoring software; verify CPU and system temperatures are within safe ranges; check for signs of power issues like flickering lights in the facility; test memory with diagnostic tools; check for bent pins or loose connections on motherboard headers; ensure adequate power supply wattage for the components; and consider environmental factors like power quality and ambient temperature variations.

To resolve expansion card issues: ensure cards are fully seated in their slots; verify appropriate driver installation; check if BIOS settings need adjustment for the card (like PCIe generation settings or resource allocation); try the card in a different slot if available; check for BIOS updates that might improve compatibility; verify the card doesn't exceed power specifications for the slot; ensure any auxiliary power connections to the card are secure; and check manufacturer compatibility lists for known issues.

BAX-R4UA

Highlights

Product Description

Technical Specifications

System Information

Processor

Platform Controller Hub

System Memory

I/O Chipset

Watchdog Timer

H/W Status Monitor

Expansion

PCIe

Front I/O

USB

Power Button

Reset Button

LED Indicator

System Fan

Power Requirement

Power Supply Unit

Mechanical & Environmental

Operating Temp.

Storage Temp.

Operating Humidity

Dimension (W x L x H)

Weight

Ordering Information

Ordering Information

What is BAX-R4UA?

Key Features & Benefits

Applications & Use Cases

Frequently Asked Questions