Dwyer Series PUF - Manual (Page 14)

2: Installation
10
2.3 Installing the USB Virtual Com. Port
If you have the CD supplied with the instrument, the USB drivers are included. Refer to the installation
instructions for Portagraph III on the CD.
If you do not have the CD, follow the instructions below.
The USB connection requires a virtual com port to be installed on the computer. The necessary driver can be
provided by Dwyer or downloaded from
http://www.ftdichip.com/Drivers/VCP.htm.
1. Access the above url and download the driver for your particular operating system. The download takes the
form of a zip file.
2. Extract all the files from the zip file into a folder and note its location (e.g. Desktop\USBDriver).
3. Switch ON the PUF instrument and connect it to the USB port on the PC.
4. A “New device found” message will appear and ask you for the location of the software installation files
for the new device.
5. Use the Browse button to select the path to the unzipped driver files and then click OK.
6. Follow the on-screen instructions to install the driver.
7. At the end of the driver installation routine you must carry out a minor configuration change to the newly
installed virtual com port. The way in which you gain access to the com port set-up window will vary
depending on your operating system. The following example applies to Windows XP.
8. Select Control Panel>System to open the SYSTEM PROPERTIES window.
9. Click the Device Manager button to open the DEVICE MANAGER window.
10. Scroll down to the Ports region and you will find the new FDTI port installed (e.g. USB Serial Port with
a high port number).
11. Right-click on the com port and select Properties.
12. From the PROPERTIES window
select the Port Settings tab
then click the Advanced button.
The ADVANCED SETTINGS window
should open similar to that shown in
Figure 2.4.
13. In the BM Options area change
the Latency Timer value from 16
msec (default) to 1 msec.
14. Select OK to implement the change,
and then close the remaining
windows that were opened.
15. Your computer should now be able
to communicate with the PUF
instrument via the USB port in the
same way as any other standard
USB device.
Figure 2.4 Com. Port configuration