Modbus Communication Via Rs-232C/Rs-485 - IDEC SmartAXIS FT9Z-1A01 User Manual

11: M
ODBUS
I ntroduction
The SmartAXIS supports the Modbus communications protocols.
When a communication cartridge is installed on the expansion communication port, Modbus RTU protocol can be used. The
SmartAXIS can communicate with hardware devices supporting Modbus RTU protocol via RS-232C/RS-485.
Modbus TCP protocol can also be used on the built-in Ethernet port. The SmartAXIS can communicate with hardware devices
supporting Modbus TCP protocol via Ethernet.

Modbus Communication via RS-232C/RS-485

Applicable SmartAXIS
FT1A-12
—
The SmartAXIS supports the Modbus RTU protocol and can be used as the Modbus RTU master and the Modbus RTU slave. When
configured as a Modbus RTU master, the SmartAXIS can monitor and change the data of Modbus RTU slave devices. When the
SmartAXIS is configured as a Modbus RTU slave, the device data of the SmartAXIS can be monitored and changed from the
Modbus RTU master device.
For the Modbus RTU master function and how to configure it, see "Modbus Master Communication" on page 11-2. For the Modbus
RTU slave function and how to configure it, see "Modbus Slave Communication Specifications" on page 11-8.
Modbus RTU Master
Notes:
Modbus communication of the SmartAXIS does not support ASCII mode. Configure all the Modbus devices to communicate with as in RTU

mode.
The 24-I/O type has one expansion communication port. The 40- and 48-I/O types have two expansion communication ports. The 12-I/O

type has no expansion communication port.
C
OM M UN I CATI ON
FT1A-24
X
Modbus RTU Slave 1
Shielded 2-core twisted pair cable, total length 200 m
S A XI S P / L
M AR T R O
FT1A-40
X
Modbus RTU Slave 31
U ' M FT9Y-B 1378
I TE SER S ANUAL
FT1A-48
X
11-1