Comtrol NS-link Windows NT User Manual download pdf (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.

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Comtrol NS-link Windows NT User Manual Page 56