Figure 3-4. Screw Terminal Ports; Figure 3-5. Termination Resistor For 2-Wire Connection - Lantronix XPress DR+ User Manual

3: Installation and Hardware

Figure 3-4. Screw Terminal Ports

Note:
Termination resistors (R = 120 Ohm) are used to match impedance of a node to
the impedance of the transmission (TX) line. Termination resistors should be placed only
at the extreme ends of the data line, and no more than two terminations should be placed
in any single segment of an RS-485 network. The termination resistors may not be
needed for your application.

Figure 3-5. Termination Resistor for 2-Wire Connection

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XPress™ DR+ Industrial Device Server User Guide