ADLINK PXI-3950 - Manual (Page 42)

28 I/O Connectors and Pin Assignments
PXI-3950
User’s Manual
2.4.2 COM1/COM2 Mode Settings (JP1/JP2/JP3/JP4/JP5/JP6)
COM1 and COM2 on PXI-3950 controllers support RS-232,
RS-422, and RS-485 specifications. JP1, JP2, JP3, JP4, JP5,
and JP6 are used set the operation mode of COM1 and COM2.
Please refer to the following table for mode settings.
Figure 2-17: COM1 & COM2 JP1 through JP6 Settings