> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lagerdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Glossary

> Definitions of technical terms used in Lager documentation

A reference of terms, abbreviations, and acronyms used throughout the Lager documentation.

## ADC

Analog-to-Digital Converter. Hardware that converts an analog voltage to a digital value. Used for reading sensor outputs, measuring voltages, etc.

## BLE

Bluetooth Low Energy. A wireless communication protocol for short-range, low-power devices.

## CLI

Command-Line Interface. The `lager` tool you install via `pip install lager-cli` and run in your terminal.

## DAC

Digital-to-Analog Converter. Hardware that outputs a precise analog voltage from a digital value. Used for generating reference voltages or test signals.

## DUT

Device Under Test. The embedded board or product you are testing with Lager.

## E-Load

Electronic Load. An instrument that draws a programmable amount of current from a power source, used to simulate real-world loads during testing.

## GDB

GNU Debugger. A widely-used debugger for embedded development. Lager starts a GDB server on the box that you can connect to remotely.

## GPIO

General-Purpose Input/Output. Digital pins that can be configured as inputs (reading HIGH/LOW) or outputs (driving HIGH/LOW).

## GPI

General-Purpose Input. A GPIO pin configured for reading digital state (HIGH or LOW).

## GPO

General-Purpose Output. A GPIO pin configured for driving digital state (HIGH or LOW).

## I2C

Inter-Integrated Circuit (pronounced "eye-squared-see"). A two-wire serial protocol (SDA + SCL) commonly used to communicate with sensors, EEPROMs, and other peripherals.

## Lager Box

A compact mini-computer (Cybergeek Mini PC) that sits in your lab, physically connected to your instruments and DUT. It runs the Lager container (Flask + SocketIO) which exposes HTTP and WebSocket APIs for hardware control.

## Net

A named logical connection to a physical instrument on a Lager Box — e.g. `supply1` mapping to channel 1 of a Rigol DP832 power supply, or `uart0` mapping to `/dev/ttyUSB0` at 115200 baud. Nets decouple test code from specific hardware addresses, so the same script works as instruments move or change.

## OCP

Over-Current Protection. A safety threshold on a power supply. If the output current exceeds this limit, the supply automatically shuts off. Clear with `lager supply <NET> clear-ocp`.

## OVP

Over-Voltage Protection. A safety threshold on a power supply. If the output voltage exceeds this limit, the supply automatically shuts off. Clear with `lager supply <NET> clear-ovp`.

## REPL

Read-Eval-Print Loop. An interactive prompt where you type commands and see results immediately. The Lager Terminal (`lager terminal`) is a REPL.

## SCPI

Standard Commands for Programmable Instruments (pronounced "skippy"). A text-based protocol used to control bench instruments like oscilloscopes and power supplies.

## SOC

State of Charge. A percentage (0-100%) representing how charged a battery is. Used with battery simulator instruments.

## SPI

Serial Peripheral Interface. A four-wire serial protocol (SCLK, MOSI, MISO, CS) used for high-speed communication with peripherals like flash memory and ADCs.

## SWD

Serial Wire Debug. A two-pin debug interface (SWDIO + SWCLK) used by ARM Cortex-M microcontrollers. Used by debug probes like J-Link to flash firmware and debug code.

## Tailscale

A WireGuard-based mesh VPN that creates encrypted tunnels between your computer and your Lager Boxes. This is how you access boxes remotely.

## TUI

Text User Interface. An interactive terminal-based interface (as opposed to a graphical UI). Lager uses TUIs for net configuration (`lager nets tui`) and real-time power supply monitoring (`lager supply <NET> tui`).

## UART

Universal Asynchronous Receiver/Transmitter. A serial communication protocol commonly used for debug console output and device communication.

## VISA

Virtual Instrument Software Architecture. A standard for communicating with test instruments over USB, LAN, or GPIB. Many bench instruments (Rigol, Keysight, Keithley) use VISA.