August 2003 . Volume 2 . Issue 6
Welcome to Sealevel Systems' monthly newsletter. The goal is to help our valued customers easily receive timely updates on the latest Sealevel developments. We appreciate your business and continue striving to be the best communications and I/O solutions provider in the market.

In This Issue:

New! Eight Port PCI Multi-Interface Serial I/O Adapter
Sealevel Systems, Inc. announces the ULTRA COMM+8.PCI, a multi-interface, eight port, Universal Bus compatible PCI adapter. Offering eight field-selectable RS-232/422/485 channels, the ULTRA COMM+8.PCI delivers ultimate flexibility for expanding serial communications in a variety of test and monitoring, control, and point-of-sale applications.

The ULTRA COMM+8.PCI supports standard PC data rates and boasts a top speed of 921.6K bps. The board is designed using the XR16C864 UART, which provides a 128-byte FIFO, eight times larger than boards designed with 16C550 compatible parts. The larger buffers allow error free operation even in high-speed applications. In RS-485 mode the ULTRA COMM+8.PCI offers automatic control of the RS-485 driver enable for trouble free network master arbitration. Additionally, the ULTRA COMM+8.PCI allows RS-485 network termination, critical to robust multi-drop communication, to be selectively added to the circuit via DIP-switches.

The ULTRA COMM+8.PCI, P/N 7804, also features Universal Bus (3.3V and 5.0V) as required by PCISIG specifications 2.3, allowing compatibility with most legacy and new computer systems.

For more info please click


Sealevel Interface Converters Deliver Maximum Reliability
All RS-232 to RS-422/485 converters are not created equal. Sealevel converters are supplied with DC power supplies to insure adequate supply drive current for the communication line. Line powered devices designed using charge pumps can limit the number of RS-422/485 devices that can be connected and may require the application software to hold the RTS and DTR lines in a certain state to guarantee that power is available. If sufficient drive current isn't available, it may mean that the link has to be connected without termination thereby making the connection more susceptible to noise.

Additionally, Sealevel converters support RS-422 full duplex mode as well as RS-485 full or half duplex master and slave modes. Autobaud, Send Data, and RTS modes are all supported, offering maximum flexibility to all of your application requirements.

For more details, please visit

Sealevel Systems' Family of Ethernet to Serial Device Servers Offers Connectivity to Legacy Systems
Sealevel Systems’ SeaLINK family of serial servers is the easiest way to connect serial devices directly to an Ethernet network.

SeaLINK products use industry standard TCP/IP protocol allowing almost any host to access serial ports as easily as if the ports were PC cards physically installed in the host. Available in 8, 4, and 1-port versions, each port can be individually configured as RS-232, RS-422, or RS-485. Designed using a powerful 32-bit embedded microprocessor and real-time operating system, SeaLINK products are able to communicate over multiple ports at sustained rates up to 230K bps. Customization is available to offload application specific tasks to the SeaLINK, thereby reducing host processor overhead.

Check out the SeaLINK at

Sealevel Application Notebook - Sea Ray Navigator State-of-the-Art Navigation
The Sea Ray Navigator state-of-the-art navigation system offers users a variety of options for plotting their course. The simple touch-screen technology includes eight different screens; Nautical Chart, NavPhoto, Contour Chart, Topo Map, Smart Craft, Telematics, Virtual Captain, and Radar. A Sealevel custom-built USB serial I/O adapter with nautical-grade USB and serial connectors is used in the Touch-Screen Radar portion of the system. The Sealevel adapter is used to generate the radar overlay picture on the Touch-Screen Radar, allowing real-time position data to be overlaid on actual charts and photos. Maptech, Amesbury, MA, designed this one-of-a-kind navigation tool and contracted Sealevel to design the custom USB to serial adapter to provide the water resistance and small size their application required.

Interfacing serial devices to a USB port is an increasingly common connectivity method. Sealevel makes a full line of robust USB to RS-232/422/485 devices ranging from single port to eight port modules. And if you do not find an off-the-shelf solution for your requirements, call us and we will design a custom solution for you as well!

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