Modular test assembly

A circuit board assembly, comprising:

• a printed circuit board (PCB);
• a plurality of dip switches attached to the PCB;
• first and second multi-pin header connectors at opposing edges of the PCB, each pin of the first multi-pin header connector electrically connected through the PCB to a corresponding pin of the second multi-pin header connector;
• first and second input/output (I/O) terminals at the opposing edges of the PCB, the first I/O terminal electrically connected through the PCB to the second I/O terminal;
• and
• a relay attached to the PCB, the relay including first and second coil terminals and first and second switch terminals, the first switch terminal electrically connected through the PCB to the first and second I/O terminals.

A test assembly, comprising:

• a first plurality of circuit boards, each of the first plurality of circuit boards mechanically and electrically connected to one other of the first plurality of circuit boards;
• each of the plurality of circuit boards includes:
• a plurality of dip switches configurable to address their respective circuit board;
• first and second input/output (I/O) terminals at the opposing edges of their respective circuit board, the first I/O terminal electrically connected through the circuit board to the second I/O terminal;
• and
• a relay including first and second coil terminals and first and second switch terminals, the first switch terminal electrically connected through their respective circuit board to the first and second I/O terminals;
• wherein each of the first plurality of circuit boards mechanically and electrically connected to one other of the plurality of circuit boards through a conductive member electrically connecting the first I/O terminal of one circuit board to the second I/O terminal of another circuit board.