NORTEK VECTRINO VELOCIMETER
User Guide
45
Rev. C • 10.2004
No Detection of the Vectrino on the Serial Port
If you cannot connect to the instrument, fi rst try sending a break to the Vectrino.
Send a break by clicking Communication > Terminal emulator, and then click-
ing the Send Break button. If the Vectrino is powered and properly connected,
and if the terminal is set to use the correct serial port, you will see the Vectrino’s
wake-up mes sage.
If you see a response consisting of garbled text or strange characters, the Vec-
trino and terminal program are probably using different baud rates. Try other
baud rates (to autodetect the baud rate use
Online > Stop Data Collection as de-
scribed in Changing the Baud Rate in Chapter 5). If you have reason to believe
that your computer is having problems, don’t hesitate to try a different computer!
May we also recommend that you verify your serial port and cable with a serial
loop-back test.
The serial loop-back test serves to verify that the serial port can receive the same
characters as it sends.
To run a serial loop-back test:
1
First, make a loop-back connector and plug it into your serial port.
Make a serial loop-back
connector by soldering pins 2
and 3 together, as shown
Now, run the test with the Vectrino’s built-in terminal emulator, and if that
doesn’t work, try HyperTerminal instead (a terminal program that comes
with Windows).
2 Type char acters – whatever you type should be echoed to the screen. Once
you remove the connector, the characters stop echoing back.
To test your interface cable:
•
Plug the cable into the com puter and put a loop-back connector on the end of
the cable.
If your serial cable passes the test and you still cannot wake up the instru ment,
there is a chance that your cable is a null modem cable – if so, it crosses wires 2
and 3. You can test this by substituting a different cable or by using a null-mo-
dem adaptor in series with the cable (which crosses the wires 2 and 3 back).
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