faqs - Posts - Page 9 - Sealevel Systems, Inc

What is a CRC in synchronous serial communications?

Dec 29th 2010

The Cyclic Redundancy Check (CRC) is a check value used to detect transmission errors in a frame or block of data. The transmitter encodes the calculated CRC … View More

Is synchronous mode the only mode that can use a BERT pattern?

Oct 30th 2010

Section 2.5 of the ITU O.151 document basically states that a pattern can be encapsulated by the framing bits of a protocol, if necessary. Therefore, the BE … View More

What kind of output is best for controlling the power to a DC motor?

Oct 30th 2010

Open-collector outputs with circuit protection are the best choice for controlling power to devices with highly inductive loads such as DC motors, solenoids, and hi … View More

How will my Sealevel synchronous serial adapter appear in Windows Device Manager?

Oct 2nd 2010

In Windows Device Manager, Sealevel synchronous serial adapters will install under the “SeaMAC Device” category. The device names for Sealevel synchronou … View More

Why does my Sealevel synchronous adapter not show up as a COM port?

Oct 1st 2010

Sealevel synchronous serial adapters enumerate as SeaMAC devices in Windows. Since the devices are zero-indexed, the first installed port will be “SeaMAC0&rd … View More

Why don’t standard asynchronous serial adapters support 9-bit protocols?

Sep 1st 2010

Applications that require 9-bit protocols are rare so the chips that support them are more expensive than standard 8-bit UARTs. Most 8-bit UARTs can simula … View More

What Sealevel asynchronous serial adapters support 9-bit protocols?

Sep 1st 2010

Any Sealevel asynchronous serial adapter that includes a 16C950 UART or 16C954 quad-port UART natively supports 9-bit framing in hardware. USB serial ada … View More

How do I perform a loopback test with my serial adapter configured for 2-wire RS-485?

Sep 1st 2010

2-wire RS-485 connects the transmitter and receiver to the same data channel. Many applications are not designed to receive the same data they are transmitting and e … View More

Can I still order Windows XP Pro for my Sealevel computer?

Jul 31st 2010

Windows XP Pro is no longer available on Sealevel computers. … View More

What does Non-Polarized refer to on Optically Isolated inputs?

Jul 31st 2010

Non-polarized means that the input trigger condition measures the voltage magnitude across the input, or alternatively the current magnitude through the input, rega … View More

How can I expand the digital I/O in my APC NetBotz appliance?

Jun 18th 2010

Downloads: APC NetBotz Application Note #134 Size: 169.68 KB Type: pdf Sealevel SeaI/O devices offer flexible I/O expansion to APC Net … View More

What is a Quadrature Counter and how is it used?

Jun 11th 2010

A Quadrature counter, also known as a Quadrature decoder, shaft decoder, or rotary decoder, is a type of digital input that uses a two-bit Gray code input to increa … View More

Are sample applications provided with the SeaMAX driver?

Jun 11th 2010

The SeaMAX Software package automatically installs several application samples with source code in the Example Projects subfolder.To access the samples from the Start … View More

How do I compile SeaMAX example applications?

Jun 11th 2010

For guidance covering the initial steps of compiling and running individual example projects using Microsoft Visual Studio, please refer to the SeaMAX API Documentati … View More

Does WinSSD support BERT patterns other than the 511-bit ITU standard sequence?

May 1st 2010

WinSSD currently only provides support for the 511-bit pattern defined in ITU document O.153 paragraph 2.1. This test pattern is common to many BERT applicat … View More

How do I change the COM port assignment for my asynchronous serial adapter?

May 1st 2010

Sealevel recommends using the installed COM numbers if at all possible to avoid system conflicts. If you previously installed a USB or PCMCIA serial interface, it … View More

How to change asynchronous serial COM Port assignments in Sealevel’s Port Manager or Advanced Ports Utilities

May 1st 2010

Sealevel recommends using the installed COM numbers if at all possible to avoid system conflicts. If you previously installed a USB or PCMCIA serial interface, it … View More

How to change asynchronous serial COM port assignments in Windows Device Manager

May 1st 2010

Sealevel recommends using the installed COM numbers if at all possible to avoid system conflicts. If you previously installed a USB or PCMCIA serial interface, it … View More

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What is a CRC in synchronous serial communications?

Is synchronous mode the only mode that can use a BERT pattern?

What kind of output is best for controlling the power to a DC motor?

How will my Sealevel synchronous serial adapter appear in Windows Device Manager?

Why does my Sealevel synchronous adapter not show up as a COM port?

Why don’t standard asynchronous serial adapters support 9-bit protocols?

What Sealevel asynchronous serial adapters support 9-bit protocols?

How do I perform a loopback test with my serial adapter configured for 2-wire RS-485?

Can I still order Windows XP Pro for my Sealevel computer?

What does Non-Polarized refer to on Optically Isolated inputs?

How can I expand the digital I/O in my APC NetBotz appliance?

What is a Quadrature Counter and how is it used?

Are sample applications provided with the SeaMAX driver?

How do I compile SeaMAX example applications?

Does WinSSD support BERT patterns other than the 511-bit ITU standard sequence?

How do I change the COM port assignment for my asynchronous serial adapter?

How to change asynchronous serial COM Port assignments in Sealevel’s Port Manager or Advanced Ports Utilities

How to change asynchronous serial COM port assignments in Windows Device Manager

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