3 6
UNO-2050 User's 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
mode selection
SW1 DIP
switch setting
Description
COM3 RS-485: Auto flow control; RS-422: Slave mode
COM4 RS-485: Auto flow control; RS-422: Slave mode
COM3 RS-485: N/A; RS-422: Master mode
COM4 RS-485: Auto flow control; RS-422: Slave mode
COM3 RS-485: Auto flow control; RS-422: Slave mode
COM4 RS-485: N/A; RS-422: Master mode
COM3 RS-485: N/A; RS-422: Master mode
COM4 RS-485: N/A; RS-422: Master mode
1
2
O
N
1
2
O
N
1
2
O
N
1
2
O
N
A
B
C
D
H
G
E
F
A
B
C
D
H
G
E
F