User’s Guide ______________________________________________________________________
76 __________________________________________________________________ M211840EN-C
Service Cable Connection
The USB Service Cable has a 4-pin M8 connector for Service Port. The 
service cable connection is recommended for checking and changing 
device settings. When making the changes, use the Vaisala 
Configuration Tool or a standard PC terminal program.
Figure 36 Service Cable Connection
The USB service cable is included in the Service Pack 2, see Table 41 
on page 180. For a picture of the service cable, see Figure 9 on page 24.
When you connect the USB service cable between the service connector 
and PC USB port, the service port settings are forced automatically to  
RS-232 / 19200, 8, N, 1, and the main serial port at the M12 connector 
at the screw terminals is disabled.
1. Use the USB service cable to establish a connection between the 
USB port of your PC and the M8 service port connector on the 
bottom plate of the transmitter. See Figure 8 on page 23.
2. Open the Vaisala Configuration Tool, or a terminal program.
3. Select the COM port reserved for the USB cable, and select the 
following default communication settings:
19200, 8, N, 1.
4. Use the Vaisala Configuration Tool or a terminal program to make 
the configuration changes. When working with a terminal 
program, see Communication Setting Commands on page 78.
5. When removing the service cable, support the transmitter while 
pulling the 4-pin M8 connector for service port. The connection is 
tight, and it is possible to change the alignment of the transmitter if 
you pull too hard.