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FS-8700-01_Modbus_RTU_(T28700-01) Driver Manual Page 6 of 21
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4. Configuring the FieldServer as a Modbus RTU or Modbus ASCII Client.
For a detailed discussion on FieldServer configuration, please refer to the FieldServer
Configuration Manual. The information that follows describes how to expand upon the factory
defaults provided in the configuration files included with the FieldServer (See “.csv” sample files
provided with the FieldServer).
This section documents and describes the parameters necessary for configuring the FieldServer
to communicate with a Modbus RTU or Modbus ASCII Server.
4.1. Data Arrays/Descriptors
The configuration file tells the FieldServer about its interfaces, and the routing of data
required. In order to enable the FieldServer for Modbus RTU or Modbus ASCII
communications, the driver independent FieldServer buffers need to be declared in the
“Data Arrays” section, the destination device addresses need to be declared in the “Client
Side Nodes” section, and the data required from the Servers needs to be mapped in the
“Client Side Map Descriptors” section. Details on how to do this can be found below.
Note that in the tables, * indicates an optional parameter, with the bold legal value being the
default.
Section Title
Data_Arrays
Column Title Function Legal Values
Data_Array_Name Provide name for Data Array
Up to 15 alphanumeric
characters
Data_Array_Format
Provide data format. Each
Data Array can only take on
one format.
FLOAT, BIT, UInt16, SInt16,
Packed_Bit, Byte,
Packed_Byte, Swapped_Byte
Data_Array_Length
Number of Data Objects. Must
be larger than the data
storage area required by the
map descriptors for the data
being placed in this array.
1-10,000
Example
// Data Arrays
Data_Arrays
Data_Array_Name, Data_Array_Format, Data_Array_Length
DA_AI_01, UInt16, 200
DA_AO_01, UInt16, 200
DA_DI_01, Bit, 200
DA_DO_01, Bit, 200