IDEC WindSRV - Manual (Page 63)

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parameter can be used to disable a physical device for servicing. After a device has been disabled, no communications
will be attempted. From a client standpoint, the data will be marked as invalid and Write operations will not be
accepted. This parameter can be changed at any time either through the menu selection or by accessing the device's
System Tags.
Simulate Device
This parameter is used to place the device into a simulation mode. While in simulation mode, the driver will not attempt
to communicate with the physical device; however, the server will continue to return valid OPC data. Unlike the Enable
data collection parameter (which stops physical communications with a given device and places the OPC data into an
error state) the Simulate Device stops physical communications with the device but allows OPC data to be returned to
the OPC client as valid data. While in Simulation mode, the server will treat all data for the device as reflective,
meaning that whatever is written to the simulated device will be Read back. Furthermore, each OPC item is treated
individually. The items' memory map is based on the Group Update Rate. The data will not be saved if the server
removes the item (such as when the server is reinitialized). Simulation mode is disabled by default. This parameter can
be changed at any time either through the menu selection or by accessing the device's System Tags. The system tags
also allow this parameter to be monitored from the OPC client. Users may turn off the ability to Write to system tags
under OPC Settings in the server.
Caution: Simulation mode is for test and simulation purposes only.
Note: With the server's online full-time operation, these parameters can be changed at any time. Changing the Device
Name can prevent clients from registering data with the server. If a client has already acquired items from the server
before the name was changed, the items will be unaffected. If, after name has changed, the client application releases
the item and attempts to reacquire it using the old device name, the item will not be accepted. Thus, users shouldn't
make changes to parameters like device name after a large client application has developed. The Device ID parameter
can be changed at any time and will take effect immediately. If the communications driver supports multiple device
models, the model selection can only be changed if there are currently no client applications connected to the device.
Utilize the User Manager to restrict access rights to server features in order to prevent operators from changing
parameters.
Device Properties - Ethernet Encapsulation
Ethernet Encapsulation mode has been designed to provide communication with serial devices connected to terminal
servers on the Ethernet network. A terminal server is essentially a virtual serial port. The terminal server converts TCP/
IP messages on the Ethernet network to serial data. Once the message has been converted to a serial form, users can
connect standard devices that support serial communications to the terminal server. For more information, refer to
How to.. Use Ethernet Encapsulation .