Hioki 2301-20, Instruction Manual, Page: 31 / 44

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4.1 Alarm output
4.1.2 Internal Circuit
The alarm output circuit is configured as shown
below.
Photocoupler
TEMP
HUM
COM
Internal circuit
• Signal logic indicates the signal state in which a
signal's function is enabled.
• The output transistor works as a switch between
signal output and ground in the module. When
output becomes enabled, the switch is turned on
and current flows from the output signal to COM
in the module. Therefore, a relay or LED lamp
can be connected directly to the output terminal
(page 28).