Lantronix XPress-DR XPress-DR / XPress-DR-IAP - User Guide - Page 20

RJ-45 Serial Connector, Table 1 - Serial RJ45 Pinouts

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Introduction 1.5 RJ-45 Serial Connector The serial RJ-45 serial connector supports up to 115200 bits per second and has the following signals. Table 1 - Serial RJ45 Pinouts Pin Direction Name 1 Not Connected 2 Hard-wired output DTR 3 To XPress DR RXD or RXA 4 From XPress DR TXD or TXA 5 6 To XPress DR GND CTS or RXB 7 From XPress DR RTS or TXB 8 Not Connected Function None DTR Data Terminal Ready RS-232: RXD (Received Data) RS-422/485:RXA (Received Data -) RS-232: TXD (Transmit Data) RS-422/485: TXA (Transmit Data -) Ground RS-232: CTS (Clear to Send) RS-422/485: RXB (Received Data +) RS-232: RTS (Request to Send) RS-422/485: TXB (Transmit Data +) None Note: Pin 2 (DTR) is hard wired (+12V) and cannot be affected by software control. Note: For RS-485 2-wire functionality, pins 3 & 4 and 6 & 7 must be connected together. 1-6 DSTni-XPress DR User Guide

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Introduction
1.5 RJ-45 Serial Connector
The serial RJ-45 serial connector supports up to 115200 bits per second and has the
following signals.
Table 1 - Serial RJ45 Pinouts
Pin
Direction
Name
Function
1
Not Connected
None
2
Hard-wired output
DTR
DTR Data Terminal Ready
3
To XPress DR
RXD or RXA
RS-232: RXD (Received Data)
RS-422/485:RXA (Received Data -)
4
From XPress DR
TXD or TXA
RS-232: TXD (Transmit Data)
RS-422/485: TXA (Transmit Data -)
5
GND
Ground
6
To XPress DR
CTS or RXB
RS-232: CTS (Clear to Send)
RS-422/485: RXB (Received Data +)
7
From XPress DR
RTS or TXB
RS-232: RTS (Request to Send)
RS-422/485: TXB (Transmit Data +)
8
Not Connected
None
Note: Pin 2 (DTR)
is hard wired (+12V) and cannot be affected by software control.
Note:
For RS-485 2-wire functionality, pins 3 & 4 and 6 & 7
must be connected together.
1-6
DSTni-XPress DR User Guide