Switch Examples Continued; Figure 3: Electrical Interface Configuration - Omega OMG-USB-SER-4 User Manual

Switch Examples Continued

Port 4
SW2
RS 232 RS 422/485
Port 4
L
L
T
PU
PD
E1 E2
Port 1 : RS-232
The corresponding shunt is in the 232 position. The switches will have
no effect.
Port 2 : RS-485 two wire communication with no echo.
The corresponding shunt is in the 422/485 position. Switches 485 2,
NE 2, and Port 2 L, L, T, PU, and PD are all in the ON position.
Port 3 : RS-422 with 120 ohm termination.
The corresponding shunt is in the 422/485 position. Switches 485 3,
NE 3, and Port 2 L, L, PU, and PD are all in the OFF position, T is in the
ON position.
Port 4 : RS-485 two wire communication with echo.
The corresponding shunt is in the 422/485 position. Switches 485 4,
and Port 2 L, L, T, PU, and PD are all in the ON position, NE 4 is in the
OFF position.
OMG-USB-SER-4
Port 3 Port 2
RS 422/485 RS 232
RS 232
Port 3
L
L
T
PU
PD
E3 E4
E5

Figure 3: Electrical Interface Configuration

Configuration
Port 1
SW4
RS 422/485
RS 422/485
Port 1
L
L
T
PU
Port 2
PD
L
L
T
PU
PD
E6
Page 7
RS 232
E7 E8