Quatech DSCLP-100 - Manual (Page 22)

Figure 13 --- Windows Device Manager
9. Use the Logical COM Port names to access the serial ports on your
DSCLP-100 through your software applications. Note: The Logical COM
Port name is assigned to your ports by Windows . This name is required
by a Windows application when accessing a particular port.
22 DSCLP/SSCLP-100 User's Manual