Serial-To-Usb Converter; Baud Rate - Nortek Vector Comprehensive Manual

102 Comprehensive Manual
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1 & 2
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5 & 6
5.1.3

Serial-to-USB converter

The converter should blink when first connected.
Converter shall match the cable (f.ex RS232 converter with matching RS232 cable)
Check that the driver is up to date (Find the port in the Device Manager, click Properties > Driver >
Update Driver). Links to current driver versions can also be found in the FAQ section on the web.
If the converter is not detected, try a different USB cable and/or a different USB port. The port
number will change when the adapter is plugged into a different USB port, but the software will
automatically detect these changes and reflect currently available ports. It is recommended to
eliminate any hubs or extension cables between the computer and the converter.
On RS422 converters check that the pins on the USB end have not been pushed in
Note that not all RS-232 USB-serial converters support data rate above 115200 baud. Using the one
supplied with the original shipment is recommended.
Vectrino Profiler: At high sampling rates (above 60 Hz), the driver parameters need to be tuned to
provide an adequate display rate for the application software. Without this tuning, higher sampling
rates will appear to be slow and bursty.
Open Windows Device Manager, expand Ports (Com and LPT), right-click on the appropriate serial
port and select Properties.
With the properties in view, click on the Port Settings tab. The baud rate displayed (9600 in the
menu shown) doesn't have to be changed. The application will automatically set the baud rate of
both the USB-serial port and the instrument to the requested rate in the connection menu so this
driver entry can be left unchanged.
Click on the Advanced button
Change the Latency Timer to 5 msec. Faster systems should be able to use 2 msec.
Remove and re-insert the USB connector to activate the parameters.
While having a lower latency timer is better, it can result in significantly higher CPU usage on slower
machines. If the data transfer from the instrument has degraded noticeably with the new latency
timer, increase it to a larger number. Ideally, this number should not be larger than 8 ms or the data
display refresh will start becoming choppy at higher sampling rates. The software will warn the user if
it detects that the latency timer has not been correctly set.
5.1.4

Baud rate

In the Serial port dialog box, you can specify two baud rates for the instruments, one for normal
communication and data transfer (Baud rate), and one for data download and firmware upgrades
(Upgrade baud rate).
For the standard Vectrino program, the default baud rate is 19200.
For Vectrino Plus, the default baud rate is 57600.
For the Vector, the default is 9600
For the Vectrino Profiler, 937500 is recommended.
A higher baud rate may reduce the download time, but note that the baud rate is limited by the
operating system used, the serial port on the computer, and the length of the USB cable. If you
experience communication errors after changing the baud rate, try changing back to the default baud
rate.
To change the baud rate permanently:
1. Set the baud rate in the Communication > Serial Port dialog box.
2. Select Connect or Online > Stop Data Collection (or the corresponding toolbar button)
Value of Ohm
1 MOhm
130 Ohm
1 MOhm
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