Comtrol NS-link Windows NT - Manual (Page 56)

56 Device Configuration
Changing Device Properties
2. Select the Main Setup tab, highlight the device, and select Properties.
3. Optionally, rename the NS-Link default name by entering a unique name in
the Name field.
4. Optionally, set a different KeepAlive Timeout Period. You can set the amount of
time in seconds that this device waits until it closes this connection and frees
all the ports associated with it.
The KeepAlive feature
works in the following
ways:
• During normal
operation the
driver periodically
sends a connection
check to the NS-
Link device, and
the device then
returns a response.
There are two
timers, one in the
driver, and one in
the device. These
timers are reset
when a connection
check signal is
received and goes
to the next signal.
If a connection is
broken, the data is
stored in the
computer and the device. Depending on the amount of time that has
expired since the connection was lost, the following happens:
-
When the computer loses its connection to the device but re-establishes
it before the timeout period expires, any data transmitted during this
period is queued and sent when the connection resumes.
- When the computer loses its connection to the NS-Link device and does
not re-establish it before the timeout period expires; the driver then
purges any pending I/O data for ports on that connection and returns
all pending, and future I/O commands, with the exception of the Close
The screen for Windows NT is similar.