Data acquisition buses: A data acquisition (DAQ) subsystem may communicate over two common buses: a data bus and a control bus (with addressing provided separately or embedded). Assess the statement.

Introduction / Context:
DAQ systems interface sensors and actuators to processors. Communication structures vary (parallel buses, SPI/I2C, PCIe). Conceptually, interactions can be viewed as data transfer plus control/handshaking, which many curricula summarize as “data bus” and “control bus.” Addressing may be explicit (address bus) or encoded within control transactions, especially in serial protocols.

Given Data / Assumptions:

• General DAQ subsystem attached to a host processor or controller.
• Parallel or serial interconnects are possible.
• Address information may be carried on a dedicated bus or multiplexed.

Concept / Approach:
The classical parallel microprocessor model uses three groups: address, data, and control. Many practical DAQ links collapse address into commands or registers accessed over the control path. Thus, describing communication in terms of a data bus (payload) and a control bus (commands, strobes, status) is acceptable in a generic sense, even though specific implementations may expose a separate address bus.

Step-by-Step Solution:

Verification / Alternative check:
Datasheets for ADC/DAC/DAQ cards show separate data width and control signaling; serial devices define command opcodes (control) distinct from payload bits (data).

Why Other Options Are Wrong:

• Incorrect: Overly rigid; many DAQ implementations follow the two-bus functional view.
• Only true with serial DAQs: Not limited to serial; applies to parallel too.
• “Always three buses”: Some designs multiplex address; “always” is false.

Common Pitfalls:
Assuming a strict three-bus taxonomy in all systems; ignoring protocol-layer multiplexing of address within control frames.

Final Answer:
Correct