2.
Gently twist the screwdriver to pop the case open as shown in
Figure 2, below. Be careful not to damage the case or con-
nector as you twist the screw driver.
3.
Once you have opened the case of the Model 2020/2020N,
you will see the DCE/DTE strap located on the PC board in
the position shown in Figure 3, below. The DCE/DTE strap
is oriented closest to the RS-232 interface.
4. The arrows on top of the strap indicate the orientation of the
Model 2020's ports. For example, if the "DCE" arrow is point-
ing toward the DB-25 connector, then the Model
2020/2020N's RS-232 port is configured as a DCE and will
connect to a RS-232 DTE port. The arrow pointing toward
the cable at the rear of the PC board shows the orientation of
the Model 2020's V.35 port.
5.
To reverse the DCE/DTE orientation, pull the entire strap out
of its socket and rotate it 180 degrees. Then plug it back into
the socket. You will see that the arrows on top now point in
the opposite directions showing the new DCE/DTE orientation
of the Model 2020.
6.
When you're done, realign the case halves (don't forget the
captive screws and saddle washers) and snap them back
together.
5
6
Figure 2. Popping open the case
DCE/DTE
Strap
Figure 3. DCE/DTE strap orientation on PC board
RS-232
Interface
RS-232
Interface
