Edgeport Industrial Installation Guide (90000409 Rev. J) – Page 1
Edgeport/1i
Edgeport USB-to-Serial Converters from Digi International provide high-speed serial connectivity
via USB port expansion for Windows 2003 Server, 2000, XP, NT 4.0, 98, SE, and Me applications.
Edgeport/1i provides one RS-422/485 serial DB-9 port. For more detailed information, as well as the
latest manual and technical updates, visit www.digi.com.
Cabling Edgeport
USB Connection
Type A Type B
Plug the Type A (flat) end of the USB cable into the USB port located in the back of your PC or into
an available USB port on a standard hub or into a Digi International Hubport . Plug the Type B
(square) end of the USB cable into the Edgeport.
RS422/485 Serial Connection
The Edgeport/1i supports RS422/RS485 protocol. To configure the features of RS-422/485
communication on the Edgeport/1i, you will short or leave unconnected certain pins at the DB9
connector of the cable. See the following pin assignment:
3 TA (T-) transmit data negative
7 TB (T+) transmit data positive
8 RA (R-) receive data negative
4 RB (R+) receive data positive
5 signal ground
2 no connect
For "jumper wire" based mode configuration, use the following pins:
1 full and half duplex
6 echo on and off
9 line termination
The user can switch on and off the following features:
Line termination (120 ohm): To enable the line termination resistor, the user connects pin 9 to pin 8.
To disable line termination, the user leaves pin 9 unconnected.
Full Duplex and Half Duplex: For Full Duplex operation, pin 1 is left unconnected. For Half Duplex
operation, the user shorts pin 1 to pin 5 (GND) at the cable connector.
Echo On and Echo Off: For Echo On mode, pin 6 is left unconnected. For Echo Off mode, the user
shorts pin 6 to pin 5 (GND) at the cable connector.
If the drivers are not already installed, go to "Edgeport Driver Installation‖ starting on page 6.
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