USB
to Serial Adapter
4
Features
Multiple Electrical Interface (MEI)
MEI adapters (model numbers ending with “-400”) are shipped with a
factory default of all serial ports set for RS-232 connections. Each
port can be individually configured for RS-232, RS-422/485 full-
duplex, or RS-422-485 half-duplex operation.
Understanding the LEDs
The LEDs inform you of the configuration of the adapter’s serial
ports. Each serial port has one associated LED located on the back
panel to the right of the port’s DB-9 connector. The following table
lists the possible states of the LEDs and their meaning.
Table 2 - LED codes
LED color
Meaning
Red
Port is configured for RS-232.
Green
Port is configured for RS-422/485.
Installing the USB-to-Serial Adapter
This section explains how to install the USB-to-Serial adapter under
different operating systems. Please locate and follow the procedure
for your computer’s operating system.
The USB-to-Serial adapter includes Windows device drivers that
enable the serial ports to appear to Windows as standard COM ports.
Installing under Windows XP
Follow these steps to install the adapter under Windows XP.
Step
Procedure
Description
Step 1
Turn on the power to your computer
system.
This is the system in which the device is to
be installed.
Step 2
Plug the wide flat end of the USB cable
into the downstream connector.
This is the connector located on the back of
the computer or USB hub.
Step 3
Plug the square end of the USB cable into
the back of the USB-to-Serial adapter.
Windows tells you that it has found new
hardware and launches the Found New
Hardware Wizard.
Caution! Be sure to allow
the installation process to
finish without interruption.
