Lantronix XPress DR User Manual

C: Connections and Pinouts
XPress™ DR Industrial Device Server User Guide 84
C: Connections and Pinouts
Serial Interface
XPress DR has a single serial port that can be accessed by an RJ-45 connector or screw block
terminals. Both connectors support RS232 and RS485/422. By setting the switch located on the
face of the XPress DR, RS232 or RS485/422 can be selected.
Note: XPress DR is a single serial port device, meaning that only the RJ-45 or the screw
terminals can be used at a time. In the configuration menu, Channel 1 can refer to either the RJ-
45 or the screw terminal currently being used.
RJ-45 Serial Connector
The serial RJ-45 serial connector supports up to 115200 bits per second and has the following
signals.
Table C-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 RX-
RS-232 RXD (Received Data)
RS-422/485: RX- (Received Data -)
4
From XPress DR
TXD or TX-
RS-232: TXD (Transmit Data)
RS-422/485: TX- (Transmit Data -)
5
GND
Ground
6
To XPress DR
CTS or RX+
RS-232: CTS (Clear to Send)
RS-422/485: RX+ (Received Data +)
7
From XPress DR
RTS or TX+
RS-232: RTS (Request to Send)
RS-422/485: TX+ (Transmit Data +)
8
Not Connected
None
Note: Pin 2 (DTR) is hard wired to an RS232 positive voltage level and cannot be affected by
software control.
Note: For RS-485 2-wire functionality, pins 3 & 4 and 6 & 7 must be connected together.

Lantronix XPress DR Specifications

General

Brand	Lantronix
Model	XPress DR
Category	Server
Language	English