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ModBus Serial Device
This screen is used to configure access to a single device on a ModBus serial network.
Settings Tab
Label
Label is the name of the item as displayed in the Device Tree.
All items in the Device Tree are sorted alphabetically by label. Folders may be used to organize items.
Description
Description is optional text that describes the item. It can be any descriptive text or be left blank.
Address
The ModBus address of the device (1-254). This can usually be found by looking at DIP switches on the device, or through the devices setup software.
Sentinel Point
The sentinel point is any valid point on the device that can be read to verify proper communications. This is optional and if not specified, output #1 will be used. It is only used in cases of suspected communications failure.
See ModBus Addressing for information on how to specify the sentinel point address.
Use ModBus function 6 to write data
Check this box to use ModBus function 6 (Preset Single Register) to write data rather than function 16 (Preset Multiple Registers). Some ModBus devices do not properly support function 16.
Leave this unchecked unless errors occur when writing point values to the device, or it is known that function 16 is not supported.
Group Settings Tab
The group settings are used to determine which user groups can see this item in the tree. The default setting is "Everyone". Unchecking "Allow Everyone" enables selecting individual groups.
If a user group is not allowed to see an item, that group will also not be able to see any items under it in the tree.
There are "Check All" and "Uncheck All" buttons in the upper-right corner to make major changes easier.
Group access permissions are for the tree only. If an item is placed on a graphic that a group can view, that group would still be able to access it.
Advanced Tab
Name
Name is used for advanced features. If left blank, it will be assigned automatically. It is recommended that the default value not be changed.It can be up to 48 characters. Only A-Z, a-z, 0-9, period (.) and underscore (_) are allowed. Names are case sensitive.