Configuring The Fieldserver As A Modbus Rtu Or Modbus Ascii Client; Data Arrays/Descriptors - FieldServer FS-8700-01 Modbus RTU Instruction Manual

FS-8700-01_Modbus_RTU_(T28700-01) Driver Manual
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
Data_Array_Name
Data_Array_Format
Data_Array_Length
Example
// Data Arrays
Data_Arrays
Data_Array_Name,
DA_AI_01,
DA_AO_01,
DA_DI_01,
DA_DO_01,
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web:www.FieldServer.com
Tel: (408) 262-2299 Fax: (408) 262-2269 Toll_Free: 888-509-1970 email: support@FieldServer.com
Function
Provide name for Data Array
Provide data format. Each
Data Array can only take on
one format.
Number of Data Objects. Must
be larger than the
storage area required by the
map descriptors for the data
being placed in this array.
Data_Array_Format,
UInt16,
UInt16,
Bit,
Bit,
Legal Values
Up to 15 alphanumeric
characters
FLOAT, BIT, UInt16, SInt16,
Packed_Bit, Byte,
Packed_Byte, Swapped_Byte
data
1-10,000
Data_Array_Length
200
200
200
200
Page 6 of 21