FC5A M
ICRO
S
MART
U
SER
’
S
M
ANUAL
FC9Y-B1268
12-1
12: M
ODBUS
ASCII/RTU C
OMMUNICATION
Introduction
This chapter describes the Modbus master and slave communication function of the MicroSmart CPU module.
All FC5A MicroSmart CPU modules can be connected to the Modbus network using communication port 2 to port 7
through the RS485 or RS232C line. The MicroSmart Modbus communication function is compatible with ASCII and RTU
modes.
Modbus Communication System Setup
To set up a 1:N Modbus communication system, install the RS485 communication adapter (FC4A-PC3) to the port 2 con-
nector on the all-in-one type CPU module.
When using the slim type CPU module, mount the RS485 communication module (FC4A-HPC3) next to the CPU module.
When using the optional HMI module with the slim type CPU module, install the RS485 communication adapter (FC4A-
PC3) to the port 2 connector on the HMI base module.
FC5A-SIF4 expansion RS485 communication module can also be mounted to the CPU module to add port 3 through port
7 to set up a 1:N Modbus communication system.
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