Rs-232/422/485 Selection - Advantech UNO-3072A User Manual

2.2.4 RS-232/422/485 Selection

COM1 and COM2 support 9-wire RS-232, RS-422 and RS-485 interfaces.
The system detects RS-422 or RS-485 signals automatically in RS-422/
485 modes. To select between RS-422/485 and RS-232 for COM1, adjust
CN28. To select between RS-422/485 and RS-232 for COM2, adjust
CN29.
You can refer to figures below to set the CN28 and CN29.
Note: Please refer to Appendix A.2 Figure A.3 for location
of CN28 and CN29 location.
Jumper setting for RS-422/485 interface: (Default setting).
Jumper setting for RS-232 interface:
UNO-3072A/3074A User Manual
Figure 2.2: RS-422/485 Jumper Setting
Figure 2.3: RS-232 Jumper Setting
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