Terminology for digital IO - "dry contact", "wet contact"

[libru97]

I am a software developer, and have implemented support for various digital I/O devices (via TCP/IP, such as ModBus). I am about to write some documentation for internal use, and the terminology being used around is kinda confusing.

These devices used ports that are either active low or active high (or, configurable to either). In some cases, "dry contact" and "wet contact" are being used. So, are these statements correct ?

Dry contact = active low = pull to ground to set HIGH

Wet contact = active high = needs a voltage to set HIGH

[santo_13]

Nope, completely different stuff.

Wet/dry contact refers to whether you need to provide an additional power supply.

https://control.com/technical-articles/the-difference-between-wet-and-dry-contacts/

One more terminology (another different) you may come across is open collector and open emitter outputs.