Mode Selection By Jumper/Dip Settings; Figure 2.22:Rs-422/485 Selection By Jumper Setting - Advantech PCI-COMM Series User Manual

2.3.3 Mode Selection by Jumper/DIP Settings

RS-232/422/485 Selection (for PCI-1612A/B/AU/U/CU)
Should you wish to configure the PCI-1612A/B/AU/U/CU to operate in
the RS-232 mode, the bottom two pins of the 12*3 pin jumper should be
connected. For RS-422/ RS-485 mode selection, the upper two pins of the
12*3 pin jumper should be connected as shown below.
Figure 2.21: PCI-1612 Series RS-232/422/485 Selection
RS-422/485 Selection (for PCI-1601/1602/1611/1612/1622)
You can set each port individually for either RS-422 (the default) or RS-
485 operation. The figure 2.11 shows the jumper setting. See section 2.2
"Jumper and Switch Locations" from figure 2.1 to figure 2.17 for help to
locate the jumpers. (Except PCI-1612CU/PCI-1611U)
Figure 2.22: RS-422/485 Selection by Jumper Setting
31 Chapter 2