Initial Setting Of Operation Via Communication - Mitsubishi Electric FR-A800 Series Instruction Manual

• Wiring between a computer and multiple inverters for RS-485 communication
Computer
RDB
*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 On the inverter most remotely connected with the computer, set the terminating resistor switch in the ON (100 Ω) position.
NOTE
• To connect the terminals in series, refer to the following.
• To connect multiple inverters using RS-485 distributors, refer to the following.
Commercially available products (as of October 2020)
 Two-wire type connection
• If the computer is 2-wire type, a connection from the inverter can be changed to 2-wire type by passing wires across
reception terminals and transmission terminals of the RS-485 terminals.
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.

5.15.3 Initial setting of operation via communication

Set the action when the inverter is performing operation via communication.
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RDA
SDA
SDB
RSA
RSB
∗1
CSA
CSB
SG
SG
FG
VCC
To computer ground
To computer receive
To computer send
Product name
BMJ-8-28N (Pins No. 2 and No. 8 are not connected internally.)
(A plug with a terminating resistor is not used.)
RS-485
DMDH-3PN (Pins No. 2 and No. 8 are not connected internally.)
distributor
DMDH-10PN (Pins No. 2 and No. 8 are not connected
internally.)
Transmission
enable
Reception
enable
search engine
SG SG
Station 0
TXD RXD VCC
Model
Computer
Pass a wire
SG
SG
SG
Station 1 Station n
TXD RXD
To receiving terminal
of the next inverter
To sending terminal
of the next inverter
To next inverter
To earth (ground)
terminal
HACHIKO ELECTRIC CO., LTD.
Diatrend Corp.
Inverter
TXD+
TXD-
RXD+
RXD-
SG
5.15 (N) Communication operation parameters
1
2
∗2
3
4
5
6
7
8
9
10
Manufacturer
663
5. PARAMETERS