Modbus TCP/IP Server Data Group Configuration: Manual Mode
1.
Click the
Edit Data Groups
button to switch from Auto-Server Mode to Manual Mode. Once
clicked the button will read
Auto-Configure Server
. The fields under the Data Groups can now
be edited.
a.
When prompted, click
OK
to confirm mode change or
Cancel
to remain in Auto Mode.
b.
Click
OK
again to keep current Data Group settings or click
Cancel
to discard the current
configuration.
2.
Enter the number of Read Data Groups and Write Data groups.
3.
Click the
Generate Data Groups
button to have the read and write data groups auto-generate
for you. You may manually configure the read and write data groups after they have been
generated.
4.
Follow these steps to manually configure Read Data Groups.
a.
Select
View Read Data Groups
if not already selected.
b.
Select a
Point Type
for each Scan Line. Options include: Coil Status, Input Status, Input
Registers, and Holding Registers.
Note
: Input/Holding Registers have a data type
associated with them.
•
String Point Type- If the mating protocol supports strings, you may select string
as a point type in Modbus. With this point type, 2 characters will be packed into
a single register and the first register will be set aside for the length.
EX: 4x Hold Reg (String) with a Starting Address of 1 for a length of 5 Registers
This means that Register 1 will hold the length of the string and Registers 2-5
will hold the string contents. This string can contain a max of 8 characters.
c.
Enter a
Starting Address
(1-based).
d.
Enter the
# of Points
to read. This will allocate the number of the data type selected.
5.
Follow these steps to manually configure Write Data Groups.
a.
Select
View Write Data Groups
if not already selected.
b.
Select a
Point Type
to configure. Options include: Coil Status and Holding Registers.
Note
: Holding Registers have a data type associated with them.
•
String Point Type- If the mating protocol supports strings, you may select string
as a point type in Modbus. With this point type, 2 characters will be packed into
a single register and the first register will be set aside for the length.
EX: 4x Hold Reg (String) with a Starting Address of 1 for a length of 5 Registers
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15
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