Depending on your application, Sealevel digital I/O products with either optically isolated inputs or TTL level signaling can be used. Sealevel products with TTL inputs require tight coupling and will work for simple applications where there is a short distance…

Sealevel SeaI/O and SeaDAC devices are fully compatible with other Modbus compliant devices, PLCs and applications. Many third party software applications and PLCs support interfacing digital I/O devices via the Modbus protocol. Sealevel devices with USB,…

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 increase or decrease a value. The Quadrature counter works in combination with an optical or mechanical…

Sealevel SeaI/O devices offer flexible I/O expansion to APC Netbotz remote environmental monitoring equipment. All APC NetBotz appliances that have a USB port support SeaI/O 450U and 462U modules to expand the amount of digital I/O. SeaI/O 450U modules provide…

Non-polarized means that the input trigger condition measures the voltage magnitude across the input, or alternatively the current magnitude through the input, regardless of the actual direction of the voltage polarity or current direction. This distinguishes…

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 high-current relays. Switching off inductive loads can induce a voltage spike capable of causing…

All Sealevel TTL Digital I/O products are configured to power up in input mode by default. This ensures that no outputs are inadvertently activated.

"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 to take place. On the other hand, if a circuit requires a logic 0 to cause action, this type circuit is…

TTL I/O devices are commonly used to control solid-state relay modules that interface a variety of input and output devices. An important consideration in these applications is to make sure that the solid-state outputs are properly configured before being…

We assume that you want to use a standard (CAT5/6 EIA/TIA-568B) Ethernet patch cable to connect to the RJ45 pass-through connector on the side of the SeaI/O module, due to their low cost, wide availability and various lengths. If you are connecting a SeaI/O…