Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 629

NOTE
• To avoid malfunction, keep the RS-485 terminal wires away from the control circuit board.
• When the FR-A820-01250(22K) or lower, or the FR-A840-00620(22K) or lower is used with a plug-in option, lead the wires
through the hole on the side face of the front cover for wiring of the RS-485 terminals.
• When the FR-A820-01540(30K) of higher, or the FR-A840-00770(30K) or higher is used with a plug-in option, lead the wires
on the left side of the plug-in option for wiring of the RS-485 terminals.
 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
628
5. PARAMETERS
5.15 (N) Communication operation parameters
Cut off with
a nipper, etc.
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
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
∗ ∗
Computer
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.