В контексте

2-wire connection

This is the connection to be used for short distances ( < 10m) between module and probe,
bearing in mind that it adds an error equivalent to the resistance contributed by the
connection cables to the measurement.
DIP-switch SW1-1 set in Position 1 (ON) (2 / 4 wires).
With bridges betweenTerminals 1 and 2 andTerminals 3 and 4.

Это описание подключения модуля преобразования сигнала для термопар..