5. Operation
5.1 Using service port
HMM170 has a 4-pin M8 service port connector on the component board. Vaisala offers an
optional USB cable (Vaisala item code 219690) for connecting the module to your PC.
The service port is intended for short-term use such as calibration. For permanent
installation, use the permanent digital Modbus and/or analog terminals.
If you have not used the HMM170 USB cable before, first install the driver.
5.1.1 Installing driver for the USB service cable
Only Windows
â
operating systems are supported by the driver of the USB
service cable.
1. Connect the USB service cable to a USB port on your computer. Windows
â
detects the
new device and installs the appropriate driver.
2. Open
Devices and Printers
from the Windows
â
Start menu. Use search to find it if
necessary (search for "devices").
3. Locate the cable in the list of devices:
• If the device is listed as
Vaisala USB Device
with a COM port number in brackets, the
cable is ready for use.
Note the COM port number, you will need it later.
• If the device is listed as
Vaisala USB Instrument Cable
without a COM port number
listed, you must install the driver manually.
Chapter 5 – Operation
19
