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Digital I/O Faqs

FAQs

Can Sealevel relay racks be externally powered?

Mar 18th 2016

Yes, all Sealevel relay racks allow an external power source to be connected to the V+ and Ground terminals. However, you need to take steps to prevent the extern … View More

Digital I/O Faqs

FAQs

Do I need to add pull-up or pull-down resistors to my Sealevel inputs?

Feb 12th 2016

No. Sealevel optically isolated and dry contact inputs are current-mode inputs, which do not require external pull-up (or pull-down) resistors to be added for mos … View More

Digital I/O Faqs

FAQs

Can I guarantee that my Sealevel Digital I/O TTL adapter outputs always power on at zero volts?

Jan 15th 2016

Yes, many of our TTL products can be modified to always power on with an off-state of zero volts (TTL “low”). All of our standard TTL adapters are designed for … View More

Asynchronous Serial Faqs

FAQs

What is the ‘Gen Mod’ that Sealevel recommended?

Jul 15th 2015

 ‘Gen Mod’ is an abbreviation of ‘Generic Modification’ and it ensures that the COM port assignments on a USB serial adapter are alw … View More

Computing

FAQs

What is a SMARC module?

Jun 16th 2015

SMARC (an acronym for “Smart Mobility ARChitecture“) defines a specification (pdf) for extremely compact and low-power Computer-on-Module (COM) solutions … View More

Computing

FAQs

What kind of touchscreen is used on the HazPAC R9-8.4 computer?

Apr 17th 2015

 The HazPAC R9-8.4 touchscreen integrates a flexible glass touch sensor that increases the durability and reliability of traditional resistive touch sensors. … View More

Analog I/O

FAQs

Should I use an RTD or thermocouple to measure temperature?

Aug 15th 2014

There are several factors to consider when choosing a temperature sensor.A Resistance Temperature Detector (RTD) is typically a metal coil wrapped around a cera … View More

General Questions

FAQs

Why do I receive Certificate Errors on the Sealevel website?

Jul 9th 2014

 Most users reporting this issue are using Windows XP and some version of Internet Explorer. The Sealevel website uses the latest methods of SNI (Server Na … View More

Digital I/O Faqs

FAQs

Are Sealevel optically-isolated inputs active high or active low?

Mar 6th 2013

It depends on how the input is wired to your application. An input is triggered when the input terminal and local common terminal of the Sealevel device detects a vo … View More

FAQs

MIL-STD-1553

What is MIL-STD-1553?

Feb 12th 2013

 MIL-STD-1553 is a military standard published in 1973 by the U.S. Department of Defense that defines the electrical, mechanical and functional specifications o … View More

Analog I/O

FAQs

What is the difference between A/D resolution and A/D accuracy?

Nov 16th 2012

 Resolution and accuracy are two commonly confused specifications for analog to digital conversions.Resolution defines the smallest increment of change that … View More

Digital I/O Faqs

FAQs

What is the difference between SeaLINK 820x and 820xFX digital I/O adapters?

Sep 14th 2012

Article Specifications: Related Models: 8203, 8203FX, 8205, 8205FX, 8206, 8206FX, 8207, 8207FX, 8208, 8208FX, 8209, 8209FX Sealevel strives to min … View More

General Questions

FAQs

What is Automated Optical Inspection (AOI) and how does it improve Sealevel product quality?

Jul 14th 2012

 Automated Optical Inspection (AOI) is an inspection technology used in the printed circuit board manufacturing process. AOI equipment is positioned near the en … View More

Asynchronous Serial Faqs

FAQs

How can I guarantee that different USB serial adapters will use the same COM port assignments?

Apr 30th 2012

 When you connect a USB serial adapter to a computer, the operating system assigns individual COM port numbers to each serial port. Each USB serial adapte … View More

Digital I/O Faqs

FAQs

Why are solid-state relay modules different colors?

Apr 30th 2012

The color is used to identify the type. The open-standard color scheme was developed by Opto 22 in 1978 to help identify the four basic types available. The universal … View More

Computing

FAQs

Can you scale the capabilities of a COM Express system?

Mar 31st 2012

  COM Express modules are available in a wide range of processor and memory configurations. The modular design of a COM Express module allows Sealevel to de … View More

Computing

FAQs

What is the expected life cycle of a COM Express system?

Mar 31st 2012

 Many COM Express modules are designed for a life cycle of five years or longer. However, from a system level perspective, the modular design of a COM Expre … View More

Computing

FAQs

What are the video capabilities of COM Express modules?

Mar 31st 2012

  COM Express video capabilities vary from module to module, so it is important to select the proper module that meets your application requirements.The PICMG … View More