Postal Address: 67/176 South Creek Road, Cromer NSW 2099, Australia
Street Address: 67/176 South Creek Road, Cromer NSW 2099, Australia
Telephone: +61 (0)2 9982 1510
Facsimile: +61 (0)2 9984 7807
Mobile: +61 (0)411 425 443



Allied Data Systems is located in the "Northern Beaches" region that is about 30 minutes drive north of the Sydney CBD.

Sealevel Systems

In 1984, Tom O'Hanlan designed the first RS-422/485 communication adapter for the IBM PC. From that moment of inspiration, Tom and his wife Susan saw an ever-growing industry-wide need - and began work to fulfill it. In 1986, they formed Sealevel Systems, Inc. committed to providing reliable, well-designed communication adapters for the IBM PC and compatibles.

More than 20 years later, Sealevel continues to provide innovative, reliable hardware and software products to enable computer connectivity and control. Today, we manufacture more than 300 standard I/O products with ISO 9001: 2000 registration and a standard lifetime warranty.



Distributed I/O all the I/O you are ever likely to need for factory automation. (See I/O Brochure PDF)

Monitor and control real-world signals with any computer using Sealevel digital and analog I/O products. Select from field-proven optically isolated inputs, Reed and Form C relay outputs, TTL connect to solid-state relays, A/D, and D/A functionality. Whether you need to monitor just a few inputs or need to create a distributed control network, we'll help you configure a solution that is perfect for your application

Synchronous and Asynchronous Serial Communications

Sealevel asynchronous and synchronous serial interfaces are designed for high-speed applications and support RS-232, RS-422, RS-485, and RS-530 electrical interface standards. Sealevel's 9065 produces USB to synchronous serial communications to Tactical Radios for the Military. Whether you choose a traditional bus-based approach, easy-to-use USB or opt for Ethernet solutions, you will be quickly communicating with your serial devices. Every product ships with thorough software drivers and useful tools to make setup and installation a snap.


Sealevel Embedded RISC Computers

The R9 family is an application-ready platform for your next product design. R9 SBC Data Sheet (PDF), Relio R9 Data Sheet (PDF) The R9 delivers RISC computing power using the latest CE 6.0 embedded software environment. The unmatched I/O features extend the capabilities beyond traditional RISC applications. The R9 is perfect for embedded applications requiring small size, wide operating temperature range and flexible I/O connectivity.

MMI and Industrial Computers

Designed for I/O intensive applications, the Relio family of embedded I/O servers combine the reliability of a PLC with the configurability of an industrial computer. SeaPAC HMI systems combine a R1000 industrial computer with bright TFT LCD and touchscreen monitors to create an impressive interactive computing solution.

Sealevel Custom Solutions

At Sealevel the challenge is as satisfying as the solution. Our engineers work with your team from conception to completion to develop a product that perfectly meets your specifications. Please allow us to show you more about custom solutions that we have designed for customers world wide.