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UNO-3072L User Manual 14

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.4 and A.5 for location of

JP4 and JP5 location

Jumper

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

Figure 2.2:

RS-422/485 Jumper

Setting

Jumper

setting for RS-232

interface:

Figure 2.3:

RS-232 Jumper

Setting

2.3.5

RS-485 Auto Flow/RS-422 Master/Slave Selection

You can set the “Auto Flow

Control” mode of RS-485 or “Master/Slave”

mode of RS-422

using the SW2

DIP switch

for each

RS-422/485 port.

(Refer to Figure A.4 and A.5 for location of SW2).

In RS-485,

if the switch

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.