November 2002 . Volume 1 . Issue 10
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:

2003 Serial Connectivity Update Now Available
Our new six page short form catalog provides an up-to-date listing of current products and pricing for our full range of serial I/O products, including PCI, Low Profile PCI, USB, ISA, CompactPCI, PCMCIA, PC/104, and our new Ethernet serial servers.

Call today for your free copy or download the 1.2MB PDF at

New! Low Profile PCI Bus Board Offers Two RS-232/422/485 ports
The Ultra.COMM+2.LPCI, part number 7205, provides two RS-232/422/485 ports, allowing a field-selectable connection to PLC's, bar code readers, scales and other data acquisition/control devices. The Low Profile form factor is especially useful in applications where space is at a premium such as 1U Servers, Thin Clients, and Net Appliance applications.

Like all new Sealevel asynchronous serial boards, the ULTRA 530.LPCI is designed using the XR16C850 UART which provides a 128-byte FIFO, 16 times larger than boards designed with 16C550 parts. The XR16C850 is backward-compatible with 16C550 parts, so there is no worry about software compatibility in existing applications.

At 2.536” tall, the Ultra.COMM+2.LPCI meets the requirements for the MD1 Low Profile specification as defined by PCISIG in PCI 2.2 “Low Profile Addendum.” Sealevel Systems, Inc. ships each adapter with both the Low Profile bracket and the standard size PCI slot bracket, offering the customer compatibility with either size PCI slot. The Ultra.COMM+2.LPCI also features a Universal Bus as required by PCISIG specification 2.3, allowing compatibility with today’s new 3.3V computers as well as older 5V systems.

New! Two Port Multi-interface PC/104 Module
Sealevel Systems, Inc. announces an addition to the company's PC/104 product line: the SIO.104+2, a dual port RS-232/422/485 interface adapter. Designed to meet the core needs of PC/104 applications requiring high reliability, small size, and long term availability, the SIO.104+2 is available in both standard and extended temperature range models.

Conforming strictly to the PC/104 specification, the SIO.104+2 provides two RS-232/422/485 ports, allowing field-selectable connection to a variety of real-world devices. Each port can be individually configured and offers automatic control of the RTS signal when using RS-485 mode.

The SIO.104+2 is designed using the XR16C850 UART, which supports standard PC data rates and boasts a top speed of 460.8K bps. The SIO.104+2 provides a 128-byte FIFO, 16 times larger than boards designed with 16C550 parts, to allow error free operation even in high-speed applications

The SIO.104+2, part number 3502, ships with Sealevel Systems’ SeaCOM™ suite of Windows 95/98/ME/NT/2000/XP drivers. Sealevel also Includes WinSSD, a full-featured application providing powerful testing and diagnostic capabilities. Use WinSSD for BERT (Bit Error Rate Testing), throughput monitoring, loopback tests, and transmit test pattern messages.

Sealevel Application Notebook
Isochronous Communications

Isochronous (pronounced eye-SAH-krun-us ) refers to a communication mode in which each byte of data is transmitted or received using asynchronous start and stop framing bits and a 1X clock. The 1X clock can be supplied externally by a transmitting device or can be generated and transmitted via on-board circuitry. This mode of operation is particularly useful in applications that require continuous streams of data and can accept occasional errors such as in high-speed audio and video applications.

Sealevel has several products that support isochronous operation. One of the most versatile is the Ultra 530.LPCI card, part number 7106-SN. In order to support isochronous mode, this version of our 7106 board is equipped with an optional 16C950 UART. This Low Profile card supports RS-232/422/485/530 electrical interfaces and is a single channel interface.

This Month’s Featured Third Party Software is:
DASYLab is one of the easiest to use data acquisition and analysis software packages available. Standard module symbols, used to represent inputs and outputs, are arranged in a worksheet then connected via the correct operation to provide the desired information for the user.

Sealevel makes implementing DASYLab easy using any of our serial I/O products. View our Third Party Application Notes at for complete details on using DASYLab and a variety of other third party products with Sealevel products.

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