Specifications

Revision: 1.0 www.CommFront.com Page 3 of 16
■ CONNECTIONS
(Figure 1: 2-WIRE RS-485 MASTER-SLAVE MULTI-DROP CONNECTIONS)
Note:
The 120Ω end-of-line terminator adds heavy DC loading to a system; connect it only when the
data rate is over 19.2kbps or the RS-485’s distance exceeds 660ft (200m).
■ DRIVER INSTALLATION – QUICK GUIDE
 For Windows 8 and 7, drivers will be installed automatically when your computer is
connected to the Internet.
 For other Operating Systems, drivers are included on the CD supplied with the
converter, please refer to the details below:
1) Insert the CD into the drive.
2) Connect the USB-485-1 to an available USB port, and the “Found New Hardware
Wizard” will guide you through the installation process. When prompted to connect
to Windows Updates to search for drivers, select “No, not at this time”, and follow
the instructions for installing from the CD.
3) Once the drivers are successfully installed, the USB-485-1 will show up in the
Windows Device Manager: under “Ports (COM & LPT)” – labeled as “USB Serial Port
(COMx)”, and under “Universal Serial Bus controllers” - labeled as “USB Serial
Converter” (Figure 2).
(Figure 2)
Revision: 1.0 www.CommFront.com Page 4 of 16
Important notes:
1) If it’s the first time you install the driver for CommFront’s USB to Serial device, you
will need to install the driver twice. One is for “USB Serial Converter”, and the other
one is for “USB Serial Port”. DO NOT close the 2
nd
“Found New Hardware
Wizard” window while installing the driver.
2) Upon completion of driver installations, remember to check the Windows Device
Manager to make sure that the drivers are installed properly (Figure 2). If the
drivers are not installed correctly, there will be a yellow exclamation icon displayed
under the “Ports (COM & LPT)” or “USB Serial Bus controllers”, right-click on the
yellow exclamation icon and select “Update driver”. Then search for the driver in the
CD supplied.
3) The drivers are not available via Microsoft Windows Updates, however, Windows
Vista will search for the drivers via Microsoft Windows Updates by default, so
disconnect your Vista PC from the internet before the driver installation.
■ DRIVER INSTALLATION - EXAMPLES
 Example 1 (Windows Vista)
1) Disconnect your PC from the internet before driver installation. This is
because the drivers are not available via Microsoft Windows Updates, but Windows
Vista will search for the drivers via Microsoft Windows Updates by default.
2) Insert the CD into the drive and connect the USB-485-1 to an available USB port,
the “Found New Hardware” window will pop up. Click on the “Locate and install
driver software (recommended)” button to continue (Figure 3).
(Figure 3)
3) Windows Vista will look for the driver in the CD, click on the “Next” button to
continue. This will start the driver installation for “USB Serial Converter” (Figure 4).