Mitsubishi Electric FR-F800 Series Instruction Manual page 500

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• Wiring between a computer and multiple inverters for RS-485 communication

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.

On the inverter most remotely connected with the computer, set the terminating resistor switch in the ON (100 Ω) position.

• To connect the terminals in series, refer to the following diagram.

• 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.

• 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.

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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.)

DMDH-3PN (Pins No. 2 and No. 8 are not connected internally.)

DMDH-10PN (Pins No. 2 and No. 8 are not connected internally.)

Transmission

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To receiving terminal

of the next inverter

To sending terminal

of the next inverter

To next inverter

To earth (ground)

HACHIKO ELECTRIC CO., LTD.

Diatrend Corp.

5.12 (N) Communication operation parameters

Manufacturer

5. PARAMETERS

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