Lantronix XPress DR+ manual Pin RS-232 to Serial RJ45 Cable P/N

Chapter 3: Installation and Hardware

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

9-Pin RS-232 to Serial RJ45 Cable (P/N 500-103)

The included Lantronix (P/N 500-103) RJ45-DB9F serial cable assumes you are connecting a typical PC Com port to the XPress DR+ serial port. This cable is pinned to provide full serial line control to an RS232 DTE device. Lantronix offers a comprehensive list of cables and adapters to simplify device connectivity to the XPress DR+. See Appendix B: Lantronix Cables and Adapters for a full listing.

Figure 3-6. Lantronix P/N 500-103 RJ45-DB9F Serial Cable Pinout

8		CTS (In)	1	RTS (Out)
1		DCD (In)	2	DTR (Out)
6		DSR (In)	3	TXD
2		RXD (In)	4	Signal Ground
5		Signal Ground	5	Signal Ground
3		TXD (Out)	6	RXD
4		DTR (Out)	7	DSR (In )
7		RTS (Out)	8	CTS (In)
DTE, 9-Pin			XPress DR+
	Female		Serial RJ45

XPress DR+ User Guide 22