Hioki RM3542-50, Instruction Manual

Page: 101 / 234

8.1 Ext. I/O Connectors and Signals
95
8
The EXT. I/O connector on the rear of the instrument supports the external control by providing sig-
nals for the end-of-measurements and comparator judgment signals, and by accepting the input of
the measurement trigger and key-lock signals.
All signals are isolated by optocouplers. (inputs and outputs share a common signal ground.)
Confirm input and output ratings, understand the safety precautions for connecting a control sys-
tem, and use accordingly.
External Control
Chapter 8
Signal input/output
Connect the EXT. I/O connector of
this instrument with the signal
output or input device
Setting the Instrument
(p. 105)
8.1 Ext. I/O Connectors and Signals
To avoid electric shock or damage to the equipment, always observe the following
precautions when connecting to the EXT. I/O connector.
• Always turn off the power to the instrument and to any devices to be connected
before making connections.
• During operation, a disconnected wire coming in contact with another conductive
object may cause a serious hazard. Make sure that the connections are secure and
use screws to secure the external connectors.
• Properly insulate any devices and instruments to be connected to the EXT. I/O con-
nector.
To avoid damage to the instrument, observe the following cautions:
• Do not apply voltage or current to the EXT. I/O connectors that exceeds their ratings.
• When driving relays, be sure to install diodes to absorb counter-electromotive force.
• Be careful not to short-circuit ISO_5V to ISO_COM.
See:
"Connector Type and Signal Pinouts" (p. 96)