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Switch Descriptions
SW2
Port 4
L
L
T
PU
PD
Figure 1: Switches SW2 and SW4
L
485 option, OFF for 422.
OFF:
No effect
ON :
Connects TX+ to RX+ for two-wire operation
L
485 option, OFF for 422.
OFF:
No effect
ON :
Connects TX- to RX- for two-wire operation
PU
485 option, OFF for 422.
OFF:
No effect
ON :
Adds a 1 K ohm pull-up resistor to RX+
PD
485 option, OFF for 422.
OFF:
No effect
ON :
Adds a 1 K ohm pull-down resistor to RX-
T
422 and 485 option.
OFF:
No effect
ON :
Adds a 120 ohm termination resistor between RX+ and RX-
OMG-USB-SER-4
Port 3
L
L
T
P U
Port 2
P D
L
L
T
PU
PD
Configuration
SW4
Port 1
L
L
T
PU
PD
Page 5
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