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UNO-3072LA User Manual 12

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

UNO-3072LA support "Auto Flow Control" mode of RS-485 in default

without any setting or jumper required. In RS-485, the driver automati-

cally senses the direction of the data flow and switches the direction of

transmission. Then no handshaking is necessary.

UNO-3072LA can also allow user to adjust "Master/Slave" mode of RS-

422 by changing setting in BIOS for each RS-422/485 port COM1 &

COM2.

1. Boot up the system or reset the system, while boot up, press "Del"

to enter into BIOS.

2. Select "Integrated Peripherals ' Onboard Device ' COM1 RS-422

or COM2 RS-422

3. The default of RS-422 is "Slave". User can change to "Master" for

RS-422 Master Device requirement.

4. Press F10 or Back to "Save and Exit Setup" to finish setup change.

In RS-422, if the device mode was set to "Master", the driver is always

enabled, and always in high or low status.

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