Instruction manual

INSTALLATION AND WIRING
23
2) When a computer having a RS-232C interface is used with inverters
Computer
Inverter
Station 1
PU connector
(Note 1)
Inverter
Station 2
PU connector
(Note 1)
Inverter
Station n
PU connector
(Note 1)
Termination
resistor
Max. 15m
RS-232C connector
RS-232C cable
R
S-485 terminal
10BASE-T cable (Note 2)
Distribution terminal
*Converter
*Converter available on the market is required. (Note 3)
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.
3. *Commercially available converter examples
Model: FA-T-RS40
Converter
Nagoya Sales Office, 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
Clear to send
Clear 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
Cable connection and signal direction
10BASE-T Cable
Termination
resistor
(Note 2)
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
)