12: M
ODBUS
ASCII/RTU C
OMMUNICATION
12-2
FC5A M
ICRO
S
MART
U
SER
’
S
M
ANUAL
FC9Y-B1268
Connect the RS485 terminals A, B, and SG on every CPU module using a shielded twisted pair cable as shown below. The
total length of the cable for the RS485 Modbus communication system can be extended up to 200 meters (656 feet).
A B SG
Cable
Cable
A B SG
Master Station
Slave Station 1
Slave Station 2
Slave Station 31
RS485 Communication
Adapter FC4A-PC3
on Port 2 Connector
RS485 Communication
Module FC4A-HPC3
All-in-One Type
CPU Module
Slim Type
CPU Module
Shielded twisted pair cable
200 meters (656 feet) maximum
Core wire 0.3mm
2
Mini DIN connector type RS485 com-
munication adapter FC4A-PC2 or
RS485 communication module FC4A-
HPC2 can also be used.
RS485 Communication
Adapter FC4A-PC3
on Port 2 Connector
HMI Base Module
FC4A-HPH1
To set up RS232C communication system, use RS232C communication adapter (FC4A-PC1), RS232C communication mod-
ule (FC4A-HPC1), or expansion RS232C communication module (FC5A-SIF2). The RS232C can set up only 1:1 communica-
tion system.
Note:
When port 1 or 2 is used for Modbus communication, use the user communication cable 1C (FC2A-KP1C). For details about the
system setup for port 1 or 2, see page 10-3. When preparing a cable for port 1, keep pins 6 and 7 open.
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