FT-112(D) Panel Weighing Indicator, Technical Manual, Rev.1.0.0, May 2019 Page 119 of 170
Modbus RTU and TCP/IP
IMPORTANT NOTE: Modbus RTU and Modbus TCP interfaces require Modbus SD card at the SD2 card slot
on the rear of the instrument.
FT-112(D) Panel controller has a Modbus RTU interface over RS485, RS422 or RS232C serial port and
Modbus TCP/IP over Ethernet TCP/IP interface. These interfaces can be programmed to High-Low or Low-
High for different type of PLC’s. You can find below the difference of these data formats and some companies
using these formats. Two types are available as;
After programming RS485, RS422 or RS232C serial port for Modbus RTU, it can be used as a Modbus RTU
slave on Modbus RTU network. The Modbus slave address is defined in the RS-485 address (Page 46).
Functions code ‘0x03’ (Read Holding Registers), ‘0x06’ (Single Write Register), ‘0x17’ (Read/Write Multiple
Registers) and ‘0x10’ (Preset Multiple Registers) are supported.
Please find Modbus information in the web site of http://www.modbus.org
Modbus RTU
Modbus RTU High-Low: In two-word registers, the data is stored to the registers in big-endian format. Least
significant word is stored to the highest register address; and most significant word is stored to the lowest
register address.
Modbus RTU Low-High: In two-word registers, the data is stored to the registers in little-endian format. Least
significant word is stored to the lowest register address; and most significant word is stored to the highest
register address.
Parameter’s set-up:
Set the RS 485 / RS 232C Data Format : Modbus RTU High-Low or Modbus RTU Low-High
RS-485 Data Length & Parity : 8 none 1, 8 odd 1 or 8 even 1
RS-485 Address : 01 to 31
Make the RS485 / RS422 / RS232C parameter settings as defined on Page 45, 46, 44.
Modbus TCP/IP
If the instrument is programmed for Modbus TCP/IP, it can be used as a Modbus TCP/IP slave on Ethernet
communication network. Functions code ‘0x03’ (Read Holding Registers), ‘0x06’ (Single Write Register),
‘0x17’ (Read/Write Multiple Registers) and ‘0x10’ (Preset Multiple Registers) are supported.
Modbus TCP/IP High-Low: In two-word registers, the data is stored to the registers in big-endian format.
Least significant word is stored to the highest register address; and most significant word is stored to the
lowest register address.
Modbus TCP/IP Low-High: In two-word registers, the data is stored to the registers in little-endian format.
Least significant word is stored to the lowest register address; and most significant word is stored to the
highest register address.
Parameter’s set-up:
Set Ethernet Data Format : Modbus TCP/IP High-Low or Modbus TCP/IP Low-High
Ethernet Address : 01 to 255
Make the Ethernet parameter settings as defined on sub-block 15-.
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