Female DB25 Connector Pinout

Switch SW1 controls the function of the serial port (ON, or up, for RS-232 Console connection, and down for Data Communication, such as when NPort Express is connected to your serial device). Note that after changing the setting of SW1, NPort Express will reboot to initialize the new setting. You must wait a few seconds for the green Ready light to blink off and then on again, indicating that the function of the serial port has been changed.

Switches SW2, SW3, and SW4 control the serial port’s data communication Interface Mode. (Note that RTS stands for Ready To Send and ADDC stands for Automatic Data Direction Control.)

Keep the following points in mind when setting the DIP switches.

•RS-232 Console

To use the serial port as a console connection, such as when using MOXA PComm Terminal Emulator or HyperTerminal, set SW1 to the ON position.

•Telnet Connection

Some setup procedures can be carried out through a Telnet connection, during which data is transmitted through NPort Express’s Ethernet port. However, you must set SW1 to the OFF position to establish a Telnet connection.

Do not use this pin *

RXD (in)

TXD (out)

CTS (in)

RTS (out)

DTR (out)

SGND

DCD (in) Reg. +5 VDC (out) Power GND for 5 VDC