Patton electronics 2002 Series User Manual page 6

Then gently twist the screw driver to pop the case open as shown
in Figure 2. Be careful not to damage the case or connector as you
twist the screw driver.
Figure 2: Using a Small Screw Driver to Open the Model 2002 Case
3.3 CHANGING THE JUMPER STRAPS
Once you have opened the case of the Model 2002, you will see
two jumper straps located the top side of the PC board (See Figure 3,
below.
TTL Side
(Male)
Figure 3: Close-Up of the Model 2002 Series Jumper Straps
To change the jumper strap settings, simply remove the jumpers
and replace them on the jumper posts as described in the following
section.
RS-232 Side
(Female)
5
JP1
JP2