Modbus Tcp/Ip Server Protocol - Technology SPX5 User Manual

routes Modbus TCP/IP messages through the correct interface (LAN or WLAN) depending on the
IP address configured here. If the IP address is not on any of the WLAN or LAN interfaces subnet,
then it is routed through the LAN default gateway. The Device Node Address is the specific
Modbus device inside the Server. Most Modbus TCP/IP Servers ignore this parameter and some
other use it to route to a different interface. Consult your Modbus Server User Manual to
determine the use of this parameter.
Modbus Function allows you selecting the Modbus function that you want this command to
execute. The available options are the 8 most commonly used Modbus functions.
The parameter 8 Device Modbus Address the user has to enter the 0 based Modbus offset of the
register that wants to be read or written. For example to enter Modbus address 40001, the user
needs to select function 3 Read Holding Registers and enter Device Modbus Address 0.
The parameter 9 SPX5 Database Address is the 16-bit word address of the SPX5 Database register
associated with this command. For read commands, the information will be copied in the
specified address. For write commands, this is the database location where the data will come
from.
Parameter 10 Register Count is the number of registers to read or write with this command. For
bit commands is the number of bits. For word commands, this parameter represents the number
of words.
Parameter 11 Data Swap allows selecting a byte swapping strategy. Because some devices that
implement the Modbus protocol use different byte alignments to represent its data, this
parameter allows two devices that use different alignment to communicate to each other.

Modbus TCP/IP Server Protocol

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