Hioki 3158 - 7.2 Connection Method

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6.1 External I/O Terminal
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6.1.2 Example of Input Signal Connection
Input signals
Active low input ( photocoupler isolated )
Max. testing voltage
30 VDC
HIGH level voltage
15 VDC or more, open
LOW level voltage
5 VDC or less ( -6 mA typ )
Input signals
START, STOP, EXT-E, INTERLOCK
Photocou
p
ler
External I/O Terminal
ISO.DCV
2.2 kΩ
Photocou
p
ler
ISO.DCV
2.2 kΩ
ISO.COM
External I/O Terminal
External Switch
NOTE
The unit can be controlled externally using the external I/O input signal. Provide a
connector that conforms to the External I/O Specifications.
To enable the external I/O signal, set the EXT-E signal (Pin 7) to Lo. Connect the
EXT-E signal to ISO.COM for the GND signal (Pins 15 to 18), which is insulated
from the unit's internal power supply. (The EXT indicator on the display screen
lights.)
EXT I/O Input signals Specifications
(1) Control using the external switch (example)
To control the START and STOP signals using a relay or switch, make
connections as shown below: (Connect the EXT-E signal (Pin 7) and ISO.COM
(Pins 15 to 18) to enable external I/O signals.)
For connection to the input signal, provide a circuit that protects the relay and
switch from chattering to prevent malfunctioning.