6
IM 77J01A0E11-01E
8th Edition
7. TROUBLESHOOTING
If the devices can not communicate each other, perform the
following checks.
□ All devices related to the communication are turned on.
□ The wiring is correct.
□ The VJ series with Output-2 other than communication is not
connected.
□ The number of connected devices and connecting distance
are within the use range.
□ The communication conditions of RS-485 connection device
are as follows.
□ Protocol: Modbus/RTU
□ Baud rate: 9600 bps
□ Data length: 8 bits
□ Stop bit: 1 bit
□ The Unit ID specified for sending by a host device and the Unit
ID of the connected RS-485 connection device are consistent.
□ The parity is consistent between VJET and RS-485 connection
device.
□ The same Unit ID is not set for the devices connected to the
same communication line.
□ The port number is correct.
□ The IP address is not changed from the factory default.
8. SAFETY AND EMC STANDARDS
The following will be acquired.
Safety:
CAN/CSA-C22.2 No.61010-1 (CSA)
UL61010-1 (UL)
Overvoltage category: I
Pollution degree: 2
Measurement category: O (other)
Rated power voltage: 24 V DC 1.8 W
Rated transient overvoltage: 1500 V (*)
* This is a reference safety standard value for the
measurement Category O. This value is not necessarily
a guarantee of instrument performance.
CAUTION
This instrument is for Measurement Category O
(other). Do not use it for measurements in locations
falling under Measurement Categories II, III, and IV.
Internal Wiring
Outlet
Entrance
Cable
III
T
O
II
IV
Measurement
category
Description
Remarks
O
(other) For measurements
performed on circuits not
directly connected to MAINS.
II
CAT.II For measurements
performed on circuits directly
connected to the low-voltage
installation.
Appliances,
portable
equipments,
etc.
III
CAT.III For measurements
performed in the building
installation.
Distribution
board, circuit
breaker, etc.
IV
CAT.IV For measurements
performed at the source of
the low-voltage installation.
Overhead
wire, cable
systems, etc.
EMC standards:
• RCM:
EN 55011 Class A, Group 1
• KC:
Electromagnetic wave interference prevention standard,
electromagnetic wave protection standard
CAUTION
Caution to comply with EMC standards: When
operating this instrument by external power supply,
use an independent power unit conforming to the
respective standards. Be sure to use the lightning
arrester to comply EMC standards.
TRADEMARKS
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• Other proper nouns such as trade names and company
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