Lantronix XPress-DR XPress-DR / XPress-DR-IAP - User Guide - Page 23

Serial Interface Connections, 8.1 9-Pin RS-232 to Serial RJ-45

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Introduction 1.8 Serial Interface Connections The serial device can be RS-232 or RS-485/422 and the connections can be screw terminals or RJ-45 connector. This section shows several practical methods for making the hardware connections. The following diagrams show typical interface cables for the RS-232 Serial interface and the Ethernet interface. 1.8.1 9-Pin RS-232 to Serial RJ-45 This connection assumes you are connecting a typical PC (COM1) to the DSTni-XPress DR through the serial RJ-45 connector. A pinout table and cable diagram are included. 4 DTR (Out) 6 DSR (In) 3 TXD (Out) 2 RXD (In) 5 Signal Ground 7 RTS (Out) 8 CTS (In) 1 No Connection 2 DTR (Out) 3 RXD (In) 4 TXD (Out) 5 Signal Ground 6 CTS (In) 7 RTS (Out) 8 No Connection DTE, 9-Pin, FEMALE SERIAL RJ-45 GND 5 DTR 9 CTS 8 RTS 7 DSR 6 4 3 TXD 2 RXD 1 DTE, 9-Pin, FEMALE 1 3 4 5 View from 8 Connector End SERIAL RJ-45 DSTni-XPress DR User Guide 1-9

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Introduction
1.8 Serial Interface Connections
The serial device can be RS-232 or RS-485/422 and the connections can be screw terminals
or RJ-45 connector. This section shows several practical methods for making the hardware
connections. The following diagrams show
typical interface cables for the RS-232 Serial
interface and the Ethernet interface.
1.8.1 9-Pin RS-232 to Serial RJ-45
This connection assumes you are connecting a typical PC (COM1) to the DSTni-XPress DR
through the serial RJ-45 connector. A pinout table and cable diagram are included.
No Connection
DTR (Out)
RXD (In)
TXD (Out)
Signal Ground
CTS (In)
RTS (Out)
No Connection
DTR (Out)
RXD (In)
TXD (Out)
Signal Ground
CTS (In)
RTS (Out)
DSR (In)
4
6
3
2
5
7
8
SERIAL RJ-45
DTE, 9-Pin, FEMALE
3
2
1
4
5
6
7
8
4
3
2
1
5
9
8
7
6
CTS
RTS
DTR
DSR
GND
TXD
RXD
5
4
3
1
8
SERIAL RJ-45
DTE, 9-Pin, FEMALE
View from
Connector End
DSTni-XPress DR User Guide
1-9