Table A-5: Rs-485 Auto Flow Control Mode And Rs-422 Master/Slave; Mode Selection - Advantech UNO-2050 User Manual

Jumper setting for RS-422/485 interface: (Default setting)
Jumper setting for RS-232 interface:
RS-485 Auto Flow Control Mode and RS-422 Master/
Slave Mode Selection
You set the "Auto Flow Control" mode of RS-485 or "Master/Slave"
mode of RS-422 by using SW1 DIP switches for each RS-422/485 port.
In RS-485, if the switche is set to "Auto", the driver automatically
senses the direction of the data flow and switches the direction of
transmission. No handshaking is necessary.
In RS-422, if DIP switche is set to "On," the driver is always enabled,
and always in high or low status.

Table A-5: RS-485 auto flow control mode and RS-422 master/slave

SW1 DIP
switch setting
1
2
1
2
1
2
1
2
3 6 UNO-2050 User's Manual
A B C D
A B C D

mode selection

COM3 RS-485: Auto flow control; RS-422: Slave mode
O
N
COM4 RS-485: Auto flow control; RS-422: Slave mode
COM3 RS-485: N/A; RS-422: Master mode
O
N
COM4 RS-485: Auto flow control; RS-422: Slave mode
COM3 RS-485: Auto flow control; RS-422: Slave mode
O
N
COM4 RS-485: N/A; RS-422: Master mode
COM3 RS-485: N/A; RS-422: Master mode
O
N
COM4 RS-485: N/A; RS-422: Master mode
E F G H
E F G H
Description