L3Harris narda PMM EP-600 User Manual page 83

Select the icon SetAddEP600 with the right mouse button and enter on
Properties  Shorcut.
Add the command COMM=N preceded by a space (in capital letters) at the
end of the Destination field where N indicates the Serial or USB port to be
used; for example, if the EP-600 is connected to port 2, add the command
COMM=2.
The assigned COM port nr. must be between 1 and 9.
In some operating system the Destination field is enclosed in double
quotation marks ("); in this case, the command COMM=N, preceded
by a space must be outside as in the example below;
Then confirm by selecting Apply
WinEP600 and SetAddEP600 operating instructions 5-29