StarTech ICUSB1284 USB to Centronics Parallel Port Adapter Cable

Overview

The StarTech ICUSB1284 solves a specific and persistent problem: your PC no longer has a parallel port, but your parallel-interface printer, plotter, or industrial device still does. This 6-foot (1.8 m) USB 2.0 to Centronics 36-pin adapter cable lets you connect legacy IEEE 1284 parallel devices to any machine with a standard USB Type-A port — no expansion card, no riser slot, no opened chassis required. It draws power directly from the USB bus at 0.9W, so there is no wall adapter to manage and no separate power supply to source.

The cable is built around the Prolific PL2305 chipset, a well-established controller in this category with broad OS driver support. At 1.8 m, it gives you enough reach to route from a desktop or tower to a printer sitting on a nearby shelf without needing a cable extender. The black plastic housing keeps the form factor simple and the total weight down to 4.2 oz (118 g), so there is no mechanical stress on either the USB port or the printer's Centronics socket.

Key Features

• USB 2.0 Type-A to Centronics 36-pin: Connects any USB-equipped desktop or laptop to legacy IEEE 1284 parallel devices — parallel printers, label applicators, older test equipment, or CNC interfaces — without opening the machine or installing an internal adapter card. If your deployment still relies on a parallel-port printer and you are out of expansion slots, this is the direct fix.
• Prolific PL2305 Chipset: The PL2305 has been in continuous use across this adapter category for years, which means driver packages are widely distributed across Windows, macOS, and Linux repositories. In managed IT environments where software approval cycles are slow, using a chipset with an established driver footprint matters.
• 12 Mbps (1.5 MB/s) Transfer Rate: USB 2.0 Full Speed is more than sufficient for IEEE 1284 parallel communication. Legacy parallel devices rarely push the bus to its limit, so the 12 Mbps ceiling is a non-issue for typical print jobs, data capture, or device control over parallel interfaces.
• USB Bus-Powered at 0.9W: The adapter draws 0.9W from the host USB port — well within the 2.5W ceiling of a standard USB 2.0 port. No external power supply, no Y-cable, no power brick. One cable, one port, done.
• 6.0 ft (1.8 m) Cable Length: Long enough to reach a desktop printer from a workstation tower or to route across a compact industrial rack without strain. For longer runs, pair with a USB active extension cable — the ICUSB1284 itself handles the parallel-to-USB conversion at one end.
• Compact Form Factor: At 2.0 in wide, 0.7 in tall, and 4.2 oz total weight, the adapter housing is small enough to leave in place permanently without interfering with adjacent ports or creating cable management issues.
• Operating Temperature 5°C to 40°C (41°F to 104°F): Rated for standard indoor office and light industrial environments. If you need this adapter running in a temperature-controlled server room, warehouse office, or production floor workstation bay, the thermal envelope covers those use cases. It is not rated for outdoor or extreme-temperature environments.
• 2-Year Manufacturer Warranty: StarTech's standard 2-year warranty applies to the ICUSB1284, providing coverage appropriate for a device deployed in a production or office environment where replacement downtime has a real cost.

Integration and Compatibility

The ICUSB1284 connects on the host side via a standard USB 2.0 Type-A plug, making it compatible with any system — desktop, laptop, or embedded — that provides a USB 2.0 or USB 3.x Type-A port (USB 3.x ports are backward-compatible with USB 2.0 devices). On the device side, the Centronics 36-pin connector is the standard IEEE 1284 parallel interface used on the majority of parallel-port printers manufactured from the 1980s through the mid-2000s, as well as many industrial controllers and data acquisition devices that were never updated to USB.

Driver installation is required on most operating systems. The Prolific PL2305 chipset has driver packages available through Prolific's website and is included in many Linux kernel distributions. Verify driver availability for your specific OS version before deploying in a locked-down or air-gapped environment. The adapter does not support ECP (Enhanced Capabilities Port) or EPP (Enhanced Parallel Port) modes that require direct hardware interrupt access — SPP (Standard Parallel Port) mode is the functional baseline over USB-to-parallel bridge adapters of this type.

Frequently Asked Questions

Q: What parallel port modes does the ICUSB1284 support?

A: The ICUSB1284 uses the Prolific PL2305 chipset, which operates in SPP (Standard Parallel Port) compatibility mode over the USB bridge. Full ECP and EPP hardware modes that require direct IRQ access are not supported, as these modes rely on direct hardware interrupt handling that the USB-to-parallel bridge architecture cannot fully replicate.

Q: Does the ICUSB1284 require an external power supply?

A: No. The ICUSB1284 is fully USB bus-powered and draws only 0.9W from the host USB port — well within the USB 2.0 standard's 2.5W supply limit. No external power adapter or Y-cable is needed.

Q: What is the warranty on the ICUSB1284?

A: StarTech provides a 2-year manufacturer warranty on the ICUSB1284.

Q: Will the ICUSB1284 work with a USB 3.0 port?

A: Yes. USB 3.0 and USB 3.1/3.2 Type-A ports are fully backward-compatible with USB 2.0 devices. The ICUSB1284 will operate correctly at USB 2.0 Full Speed (12 Mbps) when connected to a USB 3.x host port.

Q: What operating systems are supported?

A: Driver support depends on the Prolific PL2305 chipset. Drivers are available for Windows and are included in many Linux kernel builds. Verify current driver availability from Prolific for your specific OS version before deploying in a managed or restricted environment.

Q: What is the maximum cable length for reliable operation?

A: The ICUSB1284 cable itself is 6.0 ft (1.8 m). For longer USB runs, use a USB active extension cable between the host and the ICUSB1284. The Centronics parallel segment is fixed at the adapter end, so parallel signal integrity is not affected by extending the USB side of the connection.

James Everett

The ICUSB1284 comes up regularly in two scenarios I see in the field: a finance or legal office running a legacy parallel-port label printer on a workstation that was refreshed to a modern slim desktop with no expansion slots, and light industrial environments where a CNC controller or data acquisition unit with a Centronics parallel interface needs to stay in service without a full equipment replacement. The 0.9W bus-powered design is the practical detail that makes this cable genuinely easy to deploy — no one needs to source a power supply or modify the workstation setup.

Technical Highlights:

• Prolific PL2305 Chipset: Established driver availability across Windows and Linux reduces the software qualification burden in managed IT environments — this is not a no-name chipset with uncertain support.
• 12 Mbps USB 2.0 Full Speed: More than sufficient for IEEE 1284 parallel communication loads. Legacy parallel print jobs and device control traffic rarely stress this bus ceiling, so throughput is a non-issue in practice.
• 6.0 ft (1.8 m) Cable: Provides practical routing clearance from a tower workstation to a nearby printer shelf without needing an extension. The 4.2 oz total weight keeps mechanical stress on host and device connectors minimal.

Deployment Considerations:

• Confirm Prolific PL2305 driver availability for your specific OS version and build before deploying in air-gapped or software-restricted environments — driver installation is required and cannot be assumed pre-loaded.
• ECP and EPP parallel modes are not fully supported over this USB bridge architecture. If your parallel device depends on ECP mode for high-speed transfers or bidirectional communication, test compatibility before committing to a fleet deployment.

For a manufacturing floor workstation or an office environment maintaining a parallel-port printer through a hardware refresh cycle, the ICUSB1284 is the lowest-friction path to keeping that device in service — no chassis work, no expansion hardware, and a 2-year warranty backing it in a production context.