Fuji Electric Frenic Mega Series - Page 496

9.1 Overview on RS-485 Communication
9-5
Chapter 9 RUNNING THROUGH RS-485 COMMUNICATION
Multi-drop connection using the RS-485 communications port 2 (on the terminal block)
Figure 9.1-2 Multi-drop Connection Diagram (Connecting to the Terminal Block)
Use cables and converters meeting the specifications for proper connection.
(Refer to [3] "Requirements fo
r
the cable (COM port 2: for RS-485 connector)" in Section 9.1.4
"Communications support devices."
Host equipment
USB or RS-232C
Host equipment
RS-485
USB－RS-485 converter
or
RS-232C
－RS-485
converter
Off-the-shelf one
FRENIC-MEGA series
Inverter 1
DX＋
DX-
SD
FRENIC-MEGA series
Inverter 2
DX＋
DX-
SD
FRENIC-MEGA series
Inverter n
DX＋
DX-
SD
Terminating
resistor
(112Ω)
(4-wire)
Shield
(2-wire)
Station No. 01
Station No. 02
Station No. n
Using the built-in
terminating resistor
Up to 31
Switching terminating
resistors
SW2
112Ω
(2-wire)
(2-wire)
(2-wire)