Data Ac

What "Data Acquisition" Means in Industrial Computing

Data acquisition (often abbreviated DAQ) is the process of sampling physical signals — voltage, current, temperature, pressure, flow, vibration, digital pulses — converting them into digital values, and moving that data to software for logging, visualisation or control. On the factory floor, in a substation, or at a remote telemetry site, the computer that sits at the centre of this chain is usually an industrial PC (IPC) or a ruggedised mini PC rather than a desktop.

A DAQ system has three layers: sensors and signal conditioning at the edge, an acquisition layer that reads those signals at a defined sample rate, and a processing/communications layer that timestamps, stores and forwards the data. The acquisition layer may be a dedicated DAQ module, a PLC, a microcontroller, or — increasingly — the industrial PC itself, using serial (RS-232/RS-485), Modbus RTU/TCP, USB, Ethernet/IP or MQTT to talk to field devices.

What an Industrial PC Brings to a DAQ Installation

The PC layer matters more than it first appears. A data acquisition host must run continuously, survive dust, vibration and wide temperature swings, timestamp data accurately, and keep communicating when the network drops. Industrial PCs are built for that: fanless chassis with no moving parts to clog with dust, wide-range DC power inputs, DIN-rail or wall mounting, watchdog timers, and multiple hardware serial ports for legacy instruments that will never speak Ethernet.

Key technical considerations when specifying the host:

• Serial ports — Quad DB9 RS-232/RS-485 configurations let one PC poll several instruments directly, without USB-to-serial adapters that can drop out.

• CPU and memory — Data logging plus a local dashboard or SCADA client needs a modern multi-core processor and enough RAM to buffer records between network syncs.

• Storage — SSDs tolerate vibration far better than spinning disks and give faster writes for high-rate logging.

• Networking — Dual Gigabit Ethernet lets you keep the OT network and the IT/uplink network physically separate.

• Operating system — Windows 11 Pro or IoT for commercial SCADA packages, embedded Linux for long-life headless data collection.

• Power — 12 V DC input suits battery, solar and DC-bus installations common in remote telemetry.

Typical Applications