Fuji Electric Frenic Mega Series User Manual page 583

Multi-drop connection using the RS-485 communications port 2 (on the terminal block)
Host equipment
USB or RS-232C
Terminating resistor
USB RS-485 converter
or
RS-232C RS-485 converter
Off-the-shelf one
(2-wire)
Using the built-in
terminating resistor
Figure 8.2 Multi-drop Connection Diagram (Connecting to the Terminal Block)
Use cables and converters meeting the specifications for proper connection. (Refer to
[3] "Requirements for the cable (COM port 2: for RS-485 connector)" in Section 8.1.4
"Communications support devices."
Host equipment
RS-485
(4-wire)
(112 )
Switching terminating
resistors
SW2
112
8-5
8.1 Overview on RS-485 Communication
Shield
FRENIC-MEGA series
Inverter 1
Station No. 01
DX+
DX-
(2-wire)
SD
FRENIC-MEGA series
Inverter 2
DX+
Station No. 02
DX-
(2-wire)
SD
Up to 31
inverters
FRENIC-MEGA series
Inverter n
Station No. n
DX+
DX-
(2-wire)
SD