Advantech UNO-1170E - Manual (Page 19)

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2.3.4 RS-232/422/485 Selection
COM2 and COM3 support 9-wire RS-232, RS-422 or RS-485 interfaces,
and you can set corresponding jumpers to select serial ports as RS-232 or
RS-422/485 interfaces shown in Table 2.2. Please note to reset the system
to adapt this configuration change
The system detects RS-422 or RS-485 signals automatically in RS-422/
485 mode.
Jumper Setting for RS-422/485 Interface: (Default Setting)
Figure 2.5: RS-422/485 Jumper Settings
Jumper Setting for RS-232 Interfaces:
Figure 2.6: RS-232 Jumper Settings
Table 2.2: Selecting RS-232/422/485 (COM2&3)
Serial Port Corresponding Jumper to Select RS-232/422/485
COM3 CN13