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3
3
3 Serial Installation
We discuss the following topics:
¾ DIP Switch Settings
¾ DB25 Female Connector Pinout
¾ RS-232 Wiring
¾ RS-422 Wiring
¾ 4-Wire RS-485 Wiring
• Using a DB25 connector
• Using the optional Terminal Block
¾ Enabling a Termination Resistor
• Enabling the Built-In 120 Ω Terminator
• Enabling a User-Supplied Terminator
DIP Switch Settings
The top panel of NPort Express contains the following table, which describes how to
set up the serial port using the four DIP switches located on NPort
Express’s rear panel.
SW2 SW3 SW4 Serial Interface Mode
SW1
Serial
Connection
OFF OFF OFF RS-232
OFF ON ON RS-422
ON
RS-232
Console
ON OFF ON 4-Wire RS-485 by RTS
ON ON ON 4-Wire RS-485 ADDC
ON OFF OFF 2-Wire RS-485 by RTS
OFF
Data
Comm
ON ON OFF 2-Wire RS-485 ADDC