Rs-232/422/485 Selection; Rs-485 Auto Flow/Rs-422 Master/Slave Selection - Advantech UNO-3072 User Manual

Celeron m/ pentium m embedded automation computer with two pci slot extensions

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2.3.4 RS-232/422/485 Selection

COM3 and COM4 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 mode.

To select between RS-422/485 and RS-232 for COM3, adjust JP4. To

select between RS-422/485 and RS-232 for COM4, adjust JP5.

You can refer to figures below to set the JP4 and JP5.

Note:

Please refer to Appendix A.2 Figure A.3 for location

of JP4 and JP5 location

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

Jumper setting for RS-232 interface:

Y ou can set the "Auto Flow Control" mode of RS-485 or "Master/Slave"

mode of RS-422 by using the SW2 DIP switch for each RS-422/485 port.

(Refer to Figure A.3 for location of SW2).

In RS-485, if the switch is set to "Auto", the driver automatically senses

the direction of the data flow and switches the direction of transmission.

Then no handshaking is necessary. In RS-422, if DIP switch is set to "On",

the driver is always enabled, and always in high or low status.

UNO-3072 User Manual

Figure 2.2: RS-422/485 Jumper Setting

Figure 2.3: RS-232 Jumper Setting

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