Hioki 3511-50, Instruction Manual, Page: 57 / 140

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5.1 Testing Using EXT I/O
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5.1.4 Circuit Construction and Connections for the EXT I/O
Connector
CAUTION
The voltage of the external DC power supply to be connected to the
EXT DCV and EXT COM terminals should be from 5 V to 24 V. Do
not supply DC voltage greater than 24 V. If you do, there is a danger
of damage to the unit.
Moreover, for driving the circuitry, connect any device which is
capable of providing an output current of more than 200 mA.
The insulation of the signal lines is for eliminating mutual influences
between the signals. Any device which is connected to the 3511-50 unit
should always be properly protectively grounded. If proper connection to
a protective ground is not established, there is a danger of damage to
the insulation.
Internal DC power supply (5 V)
INT DCV
External DC power supply (5 V to 24 V)
EXT DCV
M-HI
_____
M-IN
_____
EOM
_____
TRIG
______
BCD00
External DC power supply (COM)
EXT COM
Internal DC power supply (COM)
INT GND
Pull up resistors
4.7 k
Ω
(1/4 W)
Ground connection to
the chassis of the unit
* Can be connected when using the internal 5 V power supply.
4.7 k
Ω
(1/4 W)
*
Circuit construction
*
The circuit construction for the EXT I/O connector is shown in the figure.
Except for the power supply lines, all of the input and output signal lines are
insulated by photocouplers.