Selectable port address, IRQ level and DMA channels
February 2009 - Issue 2 Vol. 8

Test your knowledge with Tom’s monthly trivia question.
Who is the speaker at the beginning of, “Somewhere in Heaven” on Santana’s Milagro album?

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First 10 correct responses
win Sealevel stuff.

Who was the first pop/rock singer invited to the White House to have lunch with The President?

George Harrison


   Eliminate the Risk of Data Corruption

Optical Isolation Provides Protection

Optically isolated Ethernet device

Optically isolated USB serial device

Optically isolated low profile PCI

Isolation is important when equipment is connected far from the host system or when two devices are referencing different ground planes. The difference in potential between the two locations often causes a current, or ground loop, which can generate noise or data corruption. Optically isolated devices provide a physical separation between the different potentials that results in robust communications and prevents damage to electrical equipment. Sealevel offers several isolated serial products.

  • The 4103 is a 1-port Ethernet device that connects a single RS-232, RS-422, or RS-485 serial port to your Ethernet network. The device supports data rates to 230.4K bps and includes a Reed relay output and optically isolated input for remote control and monitoring of real world devices.

  • The 2213 is a 2-port optically isolated USB serial device that is configurable for RS-232, RS-422, or RS-485 with maximum data rates to 921.6K bps. Single-port isolated USB serial devices are 2113, 2103, and 2104.

  • The 7108 is a Low Profile PCI, optically isolated serial port configurable for RS-232, RS-422, or RS-485 with data rates to 921.6K bps. For standard PCI slots, order the 7108S.


Tech Lowdown – Best Practices in Electrostatic Discharge

Electrostatic Discharge (ESD), a common occurrence in electronics and other industries, is the rapid transfer of static electricity between objects. Often tribocharging – the bringing together and separating of materials – is to blame for the build up of electrical charges. Damage can occur at such low voltages that it is impossible to detect in electrical equipment.

Electrostatic Protective Areas (EPA) are work areas designed to eliminate built-up charges that may cause damage to electronic products. Information on designing an EPA can be found on the IEC and ANSI websites. Using antistatic devices – bags, clothing, mats, straps and chemical agents – can help to prevent damage to electronic devices. ESD-safe packing materials, ionization systems and humidity control can be used to monitor and/or neutralize electrically charged areas.

Sealevel Systems utilizes ESD safety policies to prevent electrostatic damage. Antistatic smocks along with wrist and ankle straps are required within designated areas. All of our boards are packed in ESD-safe materials prior to shipping. Our manufacturing and engineering departments have state-of-the-art antistatic floor tiles. Sealevel takes every precaution to eliminate the potential for ESD damage.



Ethernet Serial Server

Ethernet to RS-232 Serial Server
Easily add four RS-232 serial ports to your Ethernet network with the 4401. All modem control signals are implemented for maximum compatibility with a wide range of peripherals.

  • Appears as virtual COM ports to host system
  • 10/100BaseT Ethernet includes watchdog/reset circuit for fault tolerance
  • Supports data rates to 230.4K bps
USB Serial Interface

USB to RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter
Easily add four RS-232 or RS-485 serial ports via USB with the 647U.

  • Both RS-232 and two-wire RS-485 signals are always present and active on the RJ45 serial connectors
  • Utilizes high speed UARTs with 128-byte Tx FIFOs and 384-byte Rx FIFOs
  • There are no internal jumpers or switches to set - field installation and service is easy
USB Software Configurable Serial Interface

USB to RS-232, RS-422, RS-485 (Software Configurable) DB9 Serial Interface Adapter
The 2223 offers an easy way to connect two serial devices to a single USB port.

  • All configuration and electrical selections are handled through the driver
  • Two ports each individually configurable for RS-232, RS-422, RS-485
  • Can be configured at one computer and deployed to other computers.
PC/104 Synchronous Serial

PC/104 RS-232, RS-422, RS-485, RS-530A, V.35 Synchronous Serial Interface
The 3512 high-speed serial module provides a direct high-speed link to instruments requiring fast data flow.

  • Uses Z85230 Enhanced Serial Communications Controller
  • Various oscillators available for custom clock rates
  • Selectable port address, IRQ level and DMA channels
Embedded Computer

Industrial Computer – Relio™ R1000 Series
The Relio R1300 delivers the processing power of a desktop computer, yet is small enough to mount virtually anywhere.

  • Powered by a 500MHz AMD Geode™ LX800 CPU
  • Local and remote I/O expansion capabilities
  • Compact, rugged metal enclosure with extruded top for maximum heat dissipation


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