Lantronix 900-422 - Manual (Page 18)

3: Installation and Hardware
XPress DR+ User Guide 18
Figure 3-2. Front Panel Layout
Serial Interface
The XPress-DR+ supports RS-232 via RJ45 connectors. It also supports RS-422/485 via
screw terminals (Serial Port 2 only).
Note: Serial Port 2 supports RS232, RS422, and RS485, but only one mode at a
time. This means you can use either the RJ45 connector or the terminal block,
not both.
The serial RJ45 serial connectors support RS232, up to 230400 bits per second.
Table 3-1. RJ45 Serial Connector Pinouts
Pin Direction Name Function
1 Output from DR+ RTS Ready To Send
2 Output from DR+ DTR Data Terminal Ready
3 Output from DR+ TXD Transmitted Data
4 Ground GND Signal Ground
5 Ground GND Signal Ground
6 Input to DR+ RXD Received Data
7 Input to DR+ DSR Data Carrier Detected
8 Input to DR+ CTS Clear To Send
Figure 3-3. RJ45 Connector – Front View