Mitsubishi Electric FR-A800 Series Instruction Manual page 663

 System configuration of RS-485 terminals
• Computer and inverter connection (1:1)
RS-485
interface/
terminals
• Combination of a computer and multiple inverters (1:n)
Computer
RS-485
interface terminals
Computer
RS-232C
converter
RS-232C
cable
Converter
 RS-485 terminal wiring method
• Wiring between a computer and an inverter for RS-485 communications
662
5. PARAMETERS
5.15 (N) Communication operation parameters
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Computer
Inverter
RS-485
terminals
∗
Twisted pair cable
Station 0
Inverter
RS-485
terminals
∗
Twisted pair cable
Station 0
Inverter
RS-485
Maximum
terminals
15m
∗
Twisted pair cable
Computer
RDA
RDB
SDA
SDB
RSA
RSB
CSA
CSB
SG
FG
search engine
Computer
RS-232C
cable
∗Set the terminating resistor switch to the "100Ω" position.
Station 1 Station n
Inverter Inverter
RS-485 RS-485
terminals terminals
∗ ∗
Station 1 Station n
Inverter Inverter
RS-485 RS-485
terminals terminals
∗ ∗
∗2
∗1
SG
Inverter
RS-485
terminals
Maximum
∗
15 m
Converter
Twisted pair cable
∗Set only the terminating resistor switch of the
remotest inverter to the "100Ω" position.
∗Set only the terminating resistor switch of the
remotest inverter to the "100Ω" position.