ICC XLTR-1000 Instruction Manual page 89

ICC
Big Endian
Enable Big Endian if the transmitted values are to be encoded in big-endian, 16-
bit word order, i.e. the most significant 16-bit word is before the least significant
16-bit word.
Word-Size Register
Enable Word-Size Register if each target register is 16-bits wide, but two 16-bit
registers are to comprise one 32-bit value. If not enabled, each of the target
registers is assumed to be 32-bits wide.
Note that when Word-Size Register is enabled, the Num Regs field name
changes to Num Reg Pairs, indicating the number of pairs of 16-bit wide
registers to be addressed. When enabled, each register pair will use two register
addresses and the selected Data Type will be applicable for the register pair, not
the individual registers. For example, if the Start Reg is 100, Num Reg Pairs is
2, and Data Type is 32-bit Unsigned, then register numbers 100 – 103 will be
remapped, with registers 100 and 101 representing the first 32-bit Unsigned
value and registers 102 and 103 representing the next 32-bit Unsigned value in
the gateway's database.
Word Count
Enable Word Count to interpret the Modbus "quantity of registers" field as the
number of 16-bit words to be transferred. If not enabled, the "quantity of
registers" field will be interpreted as the number of 32-bit registers to be
transferred.
Data Type
This field specifies how many bytes are used to store data for each register (or
register pair), as well as whether the internal value should be treated as signed or
unsigned when converted to a floating point number for transmission over the
network. Select the desired data type from this dropdown menu.
Note that each data type has different range limitations: 16-bit data types can
represent values up to 65,535, and 32-bit data types can represent values up to
4,294,967,295.
8.6.12.3 Configuration Example
This example will configure one port of the gateway (port A) for communication
using the Modbus RTU slave driver. This example will only detail the
configuration of the Modbus slave driver and related register remap objects, with
the goal of mapping data from the Modbus master into the gateway's database.
Once this data is mapped into the gateway's database, it is then accessible for
reading and writing via any other supported network connected to the other
gateway port (port B).
Assume that we have a PLC that can act as a Modbus master connected to the
gateway's "RS-485 A" port. The PLC exchanges information (through the
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