Changing The Strap - Patton electronics 2022 User Manual

Figure 2. Popping open the case

3.1.2 CHANGING THE STRAP

Once you have opened the case of the Model 2022, you will see
the green DCE/DTE strap located on the PC board in the position
shown in Figure 3 (below). The arrows on top of the strap indicate the
orientation of the Model 2022's ports. For example, if the "DCE" arrow
is pointing toward the DB-25 connector, then the Model 2022's strap is
set so that it sees its DB-25 port as DCE. It wants to plug into the
DB-25 port of a terminal or other DTE. The arrow pointing toward the
cable at the rear of the PC board shows the orientation of the Model
2022's DB-37 port.
DCE/DTE
Strap
DCE
DTE
Figure 3. DCE/DTE strap orientation on PC board
To reverse the DCE/DTE orientation, pull the entire green 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 2022.
When you're done, realign the case halves (don't forget the captive
screws and saddle washers) and snap them back together.
5