Initial Setting Of Operation Via Communication - Mitsubishi Electric FR-CS82S-025 Instruction Manual

 Wiring between a computer and an inverter for RS-485 communication
• Wiring between a computer and an inverter for RS-485 communications
Computer side terminals
Receive data
Receive data
Send data
Send data
Signal ground
• Wiring between a computer and multiple inverters for RS-485 communication
Computer
∗1
Receive
Send
SG
*1 Make connection in accordance with the Instruction Manual of the computer to be used with. Fully check the terminal numbers of the computer
since they vary with the model.
*2 The inverters may be affected by reflection depending on the transmission speed or transmission distance. If this reflection hinders
communication, provide a terminating resistor. If the PU connector is used to make a connection, use a distributor since a terminating resistor
cannot be fitted. Connect the terminating resistor to only the inverter remotest from the computer. (Terminating resistor: 100 W)
 Two-wire type connection
If the computer is 2-wire type, a connection from the inverter can be changed to 2-wire type by installing jumper wires between
the reception pins and transmission pins of the PU connector.
NOTE
• A program should be created so that transmission is disabled (receiving state) when the computer is not sending and reception
is disabled (sending state) during sending to prevent the computer from receiving its own data.
• The jumper wires should be as short as possible.

5.11.2 Initial setting of operation via communication

Set the action when the inverter is performing operation via communication.
• Set the RS-485 communication protocol. (Mitsubishi inverter protocol / MODBUS RTU protocol)
• Set the action at fault occurrence or at writing of parameters.
Cable connection and signal direction
*1
Communication cable
Cable connection and signal direction
SG
Station 1
Inverter
Computer
Transmission enable
Reception enable
Inverter
PU connector
2
0.2mm or more
Communication cable
SG
Station 2
Inverter
SDA
SDB
RDA
RDB
Pass a wire
SG SG
5.11 (N) Communication operation parameters
SDA
SDB
RDA
RDB
SG
Terminating
resistor
∗2
SG
Station n
Inverter
Inverter
5. PARAMETERS
2
2
3
4
5
6
7
8
9
10
165