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INSTALLATION AND WIRING
23
2) When a computer having an RS-232C interface is used with inverters
Computer
Terminal resistor
Max. 15m
R
S-232C connector
RS-485 terminal
*Converter
10BASE-T cable
Distribution terminal
RS-232C cable
*Converter available on the market is required. (Note 3)
(Note 2)
Inverter
Station 1
PU connector
(Note 1)
Inverter
Station 2
PU connector
(Note 1)
Inverter
Station n
PU connector
(Note 1)
(49.21feet)
Use the connector, cables and converter, which are available on the market.
Note: 1. Connector: RJ45 connector
Example: 5-554720-3, Tyco Electronics Corporation
2. Cable: Cable conforming to EIA568 (such as 10BASE-T cable)
Example: SGLPEV 0.5mm
×
4P (Twisted pair cable, 4 pairs), Mitsubishi Cable Industries, Ltd.
(Do not use pins No. 2 and 8 (P5S)).
3. *Commercially available converter examples:
Model: FA-T-RS40
Converter
Mitsubishi Electric Engineering Co., Ltd.
<Wiring method>
1) Wiring of one RS-485 computer and one inverter
Computer Side Terminals
Signal
name
Description
RDA
RDB
SDA
SDB
RSA
RSB
CSA
CSB
SG
FG
Receive data
Receive data
Send data
Send data
Request to send
Request to send
Able to send
Able to send
Signal ground
Frame ground
PU
connector
SDA
SDB
RDA
RDB
SG
Note 1
0.3mm or more
2
Cable connection and signal direction
10BASE-T Cable
Inverter
2) Wiring of one RS-485 computer and "n" inverters (several inverters)
Note
1
Computer
RDA
RDB
SDA
SDB
RSA
RSB
CSA
CSB
SG
FG
Station 1
SG
RDB
RDA
SDB
SDA
Station 2
SG
RDB
RDA
SDB
SDA
Station n
SG
RDB
RDA
SDB
SDA
Inverter Inverter Inverter
Termination
resistor
(Note 2)
Cable connection and signal direction
10 BASE-T Cable
Note: 1. Make connections in accordance with the instruction manual of the computer used.
Fully check the terminal numbers of the computer as they differ between models.
2. There may be the influence of reflection depending on the transmission speed and/or
transmission distance. If this reflection hinders communication, provide a terminal
resistor. If the PU connector is used to make a connection, use a distributor as a
terminal resistor cannot be fitted. Connect the terminal resistor only to the inverter
remotest from the computer. (Terminal resistor: 100
Ω
)