Dynasonics TFXP Series Transit Time Ultrasonic Flow Meter - Manual (Page 117)

Verifying Communications
There are several possible combinations of indicators that signal communications status. In the
lower right hand corner of the Data Display screen there is a Comm box that can take on one of
three values.
A green OK means that the physical connection to the
serial port is intact.
A red
Error indicates some kind of communications
problem.
A red
Offline is saying that the connection between the
computer and UltraLink has been turned off.
To the left of the large black graphical area is a text pane. The
second line from the bottom is labeled Last Update: and again
there are three different states for this indicator.
Next to the Last Update: label the word Never inside a
red box indicates that the TFX series meter has not made
an initial connection to the computer through UltraLink.
Under normal conditions, next to the Last Update label is a numeric Clock that changes
and is in sync with the computer time. This confirms a good communications link with the
TFX meter through UltraLink.
A clock indicator that is inside a red box and is not incrementing means that there was a
connection to the computer at one time but the connection has now been lost.
The only combination of indicators representing a functional connection between the TFX and
computer is a green
OK in the COMM box and a Last Update time that is incrementing and not
inside a red box.