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Configuration
OMG-USB-SER-2 Page 5
Switch Descriptions
Figure 1: Switch 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-
ON
1 2 3 4 5 6 7 8
OFF
9 10
Port 1
L
L
T
PU
PD
Port 2
L
L
T
PU
PD
SW4