Omega 1002 - Manual (Page 23)

2.7 Jumper Settings
There is only one jumper on the OME-PCI-1002. JP1 is used to select
the analog input type. For single-ended inputs, users should connect Pin-1, 3
and Pin-2, 4. For differential inputs, Pin-3, 5 and Pin-4, 6 should be
connected.
JP1 JP1
1 2
2 1
5 6 6 5
Differential
Inputs
Single-ended
Inputs (Default)
23