3.6 External Control
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By connecting an external device to the instrument’s external control terminals and sending signals to the
instrument from that device, the instrument can be controlled, for example to start and stop integration and
reset integrated values.
External control terminal (EXT.CONTROL)
The external control terminals are input terminals for controlling the instrument by means of either 0/5 V logic
signals or short/open contact signals.
External control terminals and description of control
External control signals are detected using the intervals illustrated in the following timing diagrams, but there
may be a delay in the display depending on the input signal frequency, synchronization signal, timeout, and
other settings.
Integration start/stop (START/STOP terminal)
3.6 External Control
Terminal name Description
START/STOP Starts/stops integration.
When a high (5 V or open) or low (0 V or shorted) signal is input to this terminal, integration starts.
When the signal changes from low to high, integration stops.
RESET Resets integrated values.
When this terminal is set to low for at least 200 ms, integrated values are reset during that period.
HOLD Display hold.
Holds the display when this terminal changes from high to low. The display hold is canceled when
the terminal changes from low to high.
GND Connect to the external device's GND terminal.
5 V (open)
0 V (shorted)
At least 400 msec.
Integration is performed during this interval.
Integration start Integration stop
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