Oldham OLCT10N Manual page 19

MAINTENANCE WIRES:
+VCC (red) = + power supply
Signal S (yellow) = signal from 0 mV to 1600 mV for zero and sensitivity settings
Ref 2,5V (brown) = zero reference for signal reading from 0 mV to 1600 mV
GND (black) = electronic circuit ground
Note: Blue and green wires will not be used.
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