Tripp Lite U208-002-IND Owner's Manual

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Pin Assignment

Jumper Settings

The included serial adapter uses a male DB9 connector. Please see the connector’s pin

assignment below:

The included serial adapters feature independent TX and RX termination resistors for

each serial port. The jumper settings (short pins) can be modiﬁed to avoid impedance

mismatch problems when operating under a multi-drop transmission. To modify the

settings, open the metal covers and set the jumper setting with the included connectors

to enable or disable 120 ohm termination resistors. The factory default setting is OPEN

(disable 120 ohm termination resistors across two wires).

6 9

Pin RS-422 RS-485 (2-Wire) RS-485 (4-Wire)

1 Tx- D- Tx-

2 Tx+ D+ Tx+

3 Rx+ N/A Rx+

4 Rx- N/A Rx-

5 GND GND GND

Open (Default) Short

17-10-300-93375A.indb 4 11/10/2017 9:59:35 AM

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Tripp Lite U208-002-IND 2-Port RS-422/RS-485 USB to Serial FTDI Adapter