Rs-232/422/485 Selection - Advantech UNO-2171 User Manual

Pentium-m/celeron-m universal network controller with pc/104+ expansion

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2.3.5 RS-232/422/485 Selection

COM3 and COM4 support 9-wire RS-232, RS-422 and RS-485 inter-

faces. The system detects RS-422 or RS-485 signals automatically in RS-

422/485 mode.

To select between RS-422/485 and RS-232 for COM3, adjust JP7.

To select between RS-422/485 and RS-232 for COM4, adjust JP8.

Jumper setting for RS-422/485 interface: (Default setting). (JP7 and JP8)

Figure 2.3: RS-422/485 Jumper Setting

Jumper setting for RS-232 interface: (JP7 and JP8)

Figure 2.4: RS-232 Jumper Setting

UNO-2171 User Manual

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