FS24X/FS20X DTM Manual, Issue 1 
 
12 
 
13. Connection to the device is now used to read data from the device and visualize them:  
 
 
4.1.1  Possible problems while connecting to device 
The following ERROR MESSAGE: “Connection to device could not be established” can be 
caused by the following: 
 
•  Transmitter is not powered 
•  HART serial interface is not connected 
•  HART modem and HART Communication DTM are using different serial ports (COM1, 
COM2, …). To determine which COM port is the right one: 
Click on Windows Start button, then type “Device Manager” and confirm with Enter. 
In opened “Device Manager”, the section “Ports  (COM  &  LPT)”  shows a list of the 
available COM-Ports. The number after “COM” needs to match with the setting that 
was made in the HART Communication DTM. If a certain USB-Modem is unplugged 
from the USB-port, its COM-port will disappear from this list.