Chapter 3 Rs-485 Communication; Outline; Wiring; Wiring Procedure - Mitsubishi Electric FR-E800 Instruction Manual (Communication

3
RS-485 Communication
3.1

Outline

RS-485 communication is available for the standard model.
Use the following parameters to perform required settings for RS-485 communication between the inverter and a personal
computer.
• Use the PU connector on the inverter as communication interface.
• Parameter setting, monitoring, etc. can be performed using Mitsubishi inverter protocol or MODBUS RTU communication
protocol.
• To make communication between the personal computer and inverter, setting of the communication specifications must
be made to the inverter in advance. Data communication cannot be made if the initial settings are not made or if there is
any setting error.
• Position control using point tables is not available for RS-485 communication.
3.2

Wiring

3.2.1

Wiring procedure

1.
Prepare the equipment required for wiring according to the connection method.
2.
Turn OFF the power of the programmable controller and the inverters.
3.
Perform wiring between communication devices.
4.
Connect a terminating resistor.
3.2.2

Connected device

 Computer-inverter connection cable
Refer to the following for the connection cable (USB to RS-485 converter) between the computer and an inverter.
Commercially available products (as of December 2019)
Product name
Interface embedded cable
*1
dedicated for inverter
*1 The conversion cable cannot connect multiple inverters. (The computer and inverter are connected in a 1:1 pair.) This is a USB-to-RS485
converter-embedded conversion cable. No additional cable or connector is required. For the product details, contact the manufacturer.
 Connection cable
Use Ethernet cables compliant with the following standards.
Ethernet cable
Category 5e or higher straight cable (double
shielded/STP)
 Distributor
Use a distributor to connect a terminating resistor to the inverter.
178
3. RS-485 Communication
3.1 Outline
Model
DINV-U4 Diatrend Corp.
Connector
RJ-45 connector
Manufacturer
The following conditioning cables:
• IEEE 802.3 (1000BASE-T)
• ANSI/TIA/EIA-568-B (Category 5e)
Type