ATEN US3344I 4-Port USB 3.1 Gen1 Industrial Hub Switch
Overview
The ATEN US3344I is a 4-computer, 4-port USB 3.1 Gen1 industrial-grade hub switch built for environments where reliable peripheral sharing across multiple workstations isn't optional — factory floors, process control rooms, and edge automation deployments where consumer-grade USB switches fail within months. The US3344I supports both RS-422 and RS-485 serial control alongside a dedicated 1.8m remote port selector, giving integrators two independent switching methods without relying on software drivers or host-side polling.
Key Features
- 4 Computer Connections via USB 3.1 Gen1: Four upstream host ports let four separate computers share downstream USB peripherals — scanners, storage, instrumentation — without physically reconnecting cables. USB 3.1 Gen1 (5 Gbps) means high-throughput devices like industrial cameras or USB SSDs won't be bottlenecked by the switch itself.
- RS-422 and RS-485 Serial Control: Port switching can be triggered directly over RS-422 (orange) or RS-485 (green) serial lines, which matters in PLC-driven environments where the host system manages peripheral allocation as part of a larger automation sequence. No USB driver needed on the controlling host — the serial port issues the command, the switch responds.
- Remote Port Selector (1.8m cable included): The included 1.8m remote selector lets an operator switch active ports from a panel or desktop location without touching the unit itself — practical when the hub is mounted inside a rack or enclosure that isn't easily accessible during a shift.
- Flexible Power Architecture — Terminal Block or DC Jack: The US3344I accepts power via terminal block, which integrates cleanly into existing panel wiring without requiring a separate power brick. A 12V DC jack (female, black) is also supported for bench or lab setups. This dual-input approach means the same unit can move between field installation and test bench without rewiring.
- Industrial Storage Temperature Range (-20–60°C): Rated to store and operate across a -20 to 60°C range, this unit can live in unheated equipment rooms, outdoor enclosures, or hot server aisles where consumer switches would throttle or fail. This is a meaningful spec separation from office-grade USB switches rated only to 40°C.
- Rack-Mount Form Factor: Designed for rack installation, the US3344I fits into standard equipment racks alongside PLCs, KVM switches, and industrial computers — keeping USB infrastructure in the same managed space as everything else rather than dangling off a DIN rail or sitting on a shelf.
- Firmware Field-Upgradeable (v1.2.112): Firmware is field-upgradeable, confirmed at version v1.2.112. This means bug fixes or protocol updates don't require hardware replacement — important for deployments with multi-year lifecycles where on-site service calls are expensive.
Integration and Compatibility
The RS-422/RS-485 serial interface makes the US3344I directly addressable by PLCs, industrial PCs, and serial-capable automation controllers without any USB enumeration dependency on the control side. Port selection via serial command is documented in the user manual (us3344i-user-manual-w.pdf, updated 2024-05-17), which covers command syntax for RS-422 and RS-485 switching sequences. The optional 12V DC power adapter (Part No. 0AD8-8012-33M1) is available separately when terminal block wiring is not preferred. For broader context on USB peripheral sharing solutions or to evaluate the full ATEN industrial switching lineup, both categories include complementary products for multi-host environments. Integrators deploying this alongside rack-mount accessories or KVM switches will find the rack form factor aligns with standard 1U-adjacent mounting configurations. For guidance on planning USB infrastructure in industrial or surveillance environments, see the industrial connectivity planning guide.
Frequently Asked Questions
Q: How does the US3344I switch between connected computers — is it software-driven or hardware-driven?
A: The US3344I supports two hardware-driven switching methods: a physical remote port selector (1.8m cable included) and serial commands over RS-422 or RS-485. No software driver is required on the switching host, making it suitable for PLC-controlled automation environments.
Q: What serial interface does the US3344I use for port control commands?
A: The unit supports both RS-422 (orange terminal) and RS-485 (green terminal) for serial command-based port switching. Both interfaces are available simultaneously via labeled terminal block connections.
Q: Can the US3344I be powered from panel wiring without a separate power supply?
A: Yes. The US3344I accepts power via terminal block, which is designed for direct panel wiring integration common in industrial control enclosures. A 12V DC jack input is also supported for setups where a standard power adapter is preferred. The optional DC adapter (Part No. 0AD8-8012-33M1) is sold separately.
Q: What is the operating temperature range of the US3344I?
A: The storage temperature rating is -20 to 60°C. This range accommodates unheated equipment rooms, outdoor-rated enclosures, and high-ambient server environments that would stress consumer-grade switches.
Q: Is the US3344I firmware field-upgradeable?
A: Yes. Firmware is field-upgradeable; current release is v1.2.112 (2022-06-01). The upgrade package is available from ATEN and can be applied without hardware replacement.
Q: How many computers can share USB peripherals through the US3344I at one time?
A: The US3344I supports 4 computer connections (4 upstream USB 3.1 Gen1 host ports). Only one computer has active control of the shared USB peripherals at a time — switching is handled via remote selector or serial command.
The US3344I solves a specific problem I see repeatedly in industrial automation installs: four workstations need to share a USB peripheral — usually a barcode scanner, USB-attached storage, or a measurement instrument — and the environment rules out anything that requires Windows-driver-based arbitration or a powered hub on an exposed desk. What makes this unit worth specifying is the RS-422/RS-485 serial switching path. Your PLC or industrial PC can command port allocation over the same serial bus you're already running, without touching any host-side software stack.
Technical Highlights:
- Dual Serial Control (RS-422 / RS-485): Both interfaces are exposed via labeled terminals — RS-422 in orange, RS-485 in green — so you can wire directly to whichever serial standard your controller already uses. This is not a USB-HID selector; the switching command goes over the serial bus, which means zero host enumeration overhead at switch time.
- Terminal Block Power Input: The primary power path is a terminal block, not a barrel jack. In a panel-mount deployment that's the difference between a clean DIN-rail installation and a wall-wart dangling off a mounted unit. The 12V DC jack is there for bench/lab use. Optional adapter Part No. 0AD8-8012-33M1 if your site needs it.
- -20 to 60°C Storage Temperature: Consumer USB switches are typically specced to 40°C storage. The 60°C ceiling on the US3344I matters in sealed enclosures during summer shutdowns or in facilities without active HVAC in the equipment room — situations where a consumer switch fails within a season.
Deployment Considerations:
- The 1.8m remote port selector cable is included and gives operators a tactile switching option without opening the rack — useful in quality control stations where the hub lives inside a locked equipment enclosure but the operator needs to hand off the USB peripheral between inspection PCs.
- Watch out: the DC jack power adapter (Part No. 0AD8-8012-33M1) is not in the box — it is sold separately. If your installation doesn't have terminal block wiring available at the mounting point, budget for this adapter before commissioning.
This unit is well-matched to process control and industrial inspection environments where four PLCs or industrial PCs share a single USB-attached instrument and switching needs to be triggered programmatically over RS-485 — not by a user clicking a software button.
