US Robotics USR3520 User Manual page 83

RS485
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One 22 KV isolated RS-485 serial port, 921.6 Kbaud maximum speed
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Connector: Examples of the connector you should use are:
o Phoenix (MC 1,5/5ST-3,81)
o Würth (691361300005)
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Termination switch: With this switch you can choose to terminate the RS485 network with a 120
Ohm resistor

Wire selection: This switch allows you to use a 4 wire network or a 2 wire network
You can use the gateway in a 2 wire network as shown below:
You can use the gateway in a 4 wire network as shown below:
Revision: 1.00 Copyright 2015 U.S. Robotics Corporation 83 | P a g e