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2.2.6 RS-485 Auto Flow/RS-422 Master/Slave Selection
UNO-3072A/3074A support "Auto Flow Control" mode of RS-485 in
default without any setting or jumper required. In RS-485, the driver
automatically senses the direction of the data flow and switches the direc-
tion of transmission. Then no handshaking is necessary.
UNO-3072A/3074A 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.
UNO-3072A/3074A User Manual
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