Fuji Electric FRENIC MEGA G2 Series - Page 705

9.1 Overview of RS-485 Communication
9-5
COMMUNICATION FUNCTIONS
Chap 9
Multi-drop connection using the RS-485 COM port 2 (terminal block)
Fig. 9.1-2 Multi-drop connection diagram (terminal block connection)
Use the cables and converters meeting the modes for connecting the RS-485 COM ports.
(Refer to “[3] Requirements for the cable (COM port 2: for RS-485 terminal block connection)" in
“9.1.4 RS-485 connection devices".)
With 4-wire systems, short and connect
the respective inputs and outputs
externally.
Host equipment
Host equipment
FRENIC-MEGA series
FRENIC-MEGA series
FRENIC-MEGA series
Inverter n
Terminating resistor
(110 Ω)
(4 wire system)
Shield
Station No.: 01
(2 wire system)
Station No.: 02
(2 wire system)
Station No.: n
(2 wire system)
Max. 31 units
Terminating resistor
select switch
SW2 110 Ω
(2 wire system)
RS-485
+
-
FG
Inverter 1
Inverter 2
DX+
DX-
SD
DX+
DX-
SD
SD
DX+
DX-
RS-485
OUT+
OUT-
IN+
IN-
FG