NPort W2150A-W4/W2250A-W4 Series User Manual
9
Pull High/Low Resistors for RS-422/485
You may need to set the pull high/low resistors when termination resistors are used for certain RS-422 or
RS-485 environments.
S4
(Port 1)
S5
(Port 2)
DIP 1
Pull high resistor
DIP 2
Pull low resistor
DIP 3
Termination resistor
DIP 4
Reserved
ON
1 KΩ
1 KΩ
120 Ω
–
OFF
*150 KΩ
*150 KΩ
*N/A
–
*Default
S5
is for NPort W2250A-W4 only
ATTENTION
Do not use the 1 KΩ setting while in RS
-232 mode. Doing so will degrade the RS-232 signals and reduce
the effective communication distance.