Vaisala Drycap DMT152, User Manual

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5. Serial Line Operation
5.1 Connecting to Serial Interface
DMT152 can be connected to a PC using the RS-485 line on Port II. You can use, for example,
the USB serial interface cable (Vaisala order code 219690). The cable also provides enough
operating power for transmitter configuration purposes from the USB port. For continuous
measurement, it is recommended to supply the transmitter with operating power from another
cable: see
Power Supply Requirements (page 19) .
If you have not used the DMT152 USB serial interface cable before, install the driver that came
with the cable. See
Installing Driver for USB Service Cable (page 29) for detailed instructions.
5.1.1 Installing Driver for USB Service Cable
Before taking the USB service cable into use, you must install the provided USB driver on your
PC. When installing the driver, you must acknowledge any security prompts that may appear.
The driver is compatible with Windows 7, Windows 8, and Windows 10.
1. Check that the USB service cable is not connected. Disconnect the cable if you have
already connected it.
2. Insert the media that came with the cable, or download the driver from www.vaisala.com/
software .
3. Execute the USB driver installation program (setup.exe), and accept the installation
defaults. The installation of the driver may take several minutes.
4. After the driver has been installed, connect the USB service cable to a USB port on your
PC. Windows will detect the new device, and use the driver automatically.
5. The installation has reserved a COM port for the cable. Verify the port number, and the
status of the cable, using the Vaisala USB Instrument Finder program that has been
installed in the Windows Start menu.
Windows will recognize each individual cable as a different device, and reserve a new COM
port. Remember to use the correct port in the settings of your terminal program.
There is no reason to uninstall the driver for normal use. However, if you wish to remove the
driver files and all Vaisala USB cable devices, you can do so by uninstalling the entry for
Vaisala USB Instrument Driver in Windows Control Panel .
5.1.2 Terminal Application Settings
Table 7 Default Serial Interface Settings
Property Description / Value
Baud rate 19200
Parity None
Chapter 5 – Serial Line Operation
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