Advantech Industrial Mini-ITX Motherboard with DDR2/Dual GbE/PCI AIMB-221 - Manual (Page 20)

AMB-221 User Manual 10
Figure 1.4 COM2 RS-232/422/485 jumper setting
Table 1.3: ATX/AT mode selector (JPSON1)
Function Jumper Setting
AT Mode
ATX Mode*
*Default setting
Table 1.4: COM1 RS-232 with 5V or 12V selector (JSETCOM1)
Use jumper to select the 5V or 12V mode for COM1. The default setting is RS-232 ring in.
Table 1.5: COM2 RS-232/422/485 mode selector (JSETCOM2)
Use JP1 to select the RS-232/422/485 mode for COM2. The default setting is RS-232.
1-2 closed
2-3 closed
RS-232 Ring In RS-232 with 5 V RS-232 with 12 V
1 2 1 2 1 2