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November 12, 2021 - FAQs, Digital I/O

What is the difference between positive and negative logic in digital I/O circuits?

“When a circuit requires logic 1 to operate, engineers may refer to this condition as positive logic. Thus, the more positive voltage causes the action…

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March 3, 2021 - FAQs, Digital I/O, Software Utilities, Analog I/O

What programming languages can I use with SeaMAX for Windows to control Sealevel SeaI/O and eI/O digital and analog I/O devices?

SeaMAX for Windows provides both a .NET DLL and a native DLL with nearly identical capability to control these device types.  The .NET DLL should…

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January 19, 2017 - Digital I/O

How do I interpret error return values from SeaMAX functions when debugging my SeaMAX program?

The SeaMAX API Documentation is the go-to source for understanding the error return values of a SeaMAX function. The SeaMAX documentation for each function provides…

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January 19, 2017 - Digital I/O

What could cause an error from my first SeaMAX I/O function call?

  An error can occur in the first SeaMAX I/O function call if a SeaMAX function call that is necessary to set up the communication…

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September 15, 2016 - Digital I/O

How should I connect an optically isolated input and voltage supply to a dry contact output?

Sealevel’s SeaI/O modules are a good choice for this application. For example, using a SeaI/O-430 module with 32 isolated inputs, we can connect the dry…

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September 2, 2016 - Digital I/O

What is “Flyback Voltage” and what should I do about it?

  A “Flyback Voltage Spike” occurs when the supply current to an inductive load such as a solenoid is interrupted. Any switching circuit for highly…

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September 2, 2016 - Digital I/O

What type of relay should I use to control a 24 VDC solenoid?

  The Form C relays contained in many Sealevel digital I/O products are the best choice for switching highly inductive loads like solenoids. Other relays, including…

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March 17, 2016 - Digital I/O

Can Sealevel relay racks be externally powered?

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…

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February 11, 2016 - Digital I/O

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

  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…

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