Advantech DVMB-554E - Manual (Page 24)

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1.8.4 COM2 RS 232/422/485 mode selector (J2)
Users can use J2 to select among RS 232/422/485 modes for COM2.
The default setting is RS 232.
Table 1.6: COM2 RS 232/422/485 mode selector (J2)
Function Jumper Setting
RS232 (5-6) + (7-9) + (8-10) + (13-15) + (14-16) closed
RS422 (3-4) + (9-11) + (10-12) + (15-17) + (16-18) closed
RS485 (1-2) + (9-11) + (10-12) + (15-17) + (16-18) closed
1.8.5 LVDS Power 3.3V/5V selector (J6)
Table 1.7: LVDS Power 3.3V/5V selector (J6)
Function Jumper Setting
5V 1
1-2 closed
*3.3V
1
2-3 closed
*default setting