
Introduction
Table 4 - Front Panel Components
Item
Component
Name Purpose
1 Screw terminal RXD or RXA
RS-232: RXD (Received Data)
RS-422/485:RXA (Received Data -)
2 Screw terminal CTS or RXB
RS-232: CTS (Clear to Send)
RS-422/485: RXB (Received Data +)
3 Screw terminal RTS or TXB
RS-232: RTS (Request to Send)
RS-422/485: TXB (Transmit Data +)
4 Screw terminal TXD or TXA
RS-232: TXD (Transmit Data)
RS-422/485: TXA (Transmit Data -)
5, 6, 7 Screw terminal NC No connection
8 Screw terminal GND Signal ground
9 Reset switch RESET Push to power reset and initialize
10 LED (Red)
Fault or
Configuration
SOLID: Fault in XPress DR communication
(read error) or
XPress DR is in Configuration
Mode
11 LED (Green) Ready SOLID: Ready, Flashing: Error Message
12 LED (Yellow) Activity FLASHING: Network traffic
13 LED (Green) Link
SOLID:
XPress DR has good Ethernet link
14 Connector (RJ45) Ethernet port RJ45 connector for Ethernet 10BaseT
15 Connector (RJ45) Serial port RJ45 connector for RS-232,RS-422/485
16 LED (Yellow) Serial TXD
FLASHING: Indicates transmission
from the serial port
17 LED (Yellow) Serial RXD
FLASHING: Indicates reception
to the serial port
18 Switch
Switch for
screw block
UP: Serial RS-232
DOWN: Serial RS-422/485
19 Screw terminal DC + (or AC) Operating power, DC positive or AC
20 Screw terminal Ground Earth ground
21 Screw terminal DC – (or AC) Operating power, DC negative or AC
22 Screw terminal Ground Earth ground
Note: For RS-485 2-wire functionality, pins 1 & 4 and 2 & 3 of the screw terminals must be
connected together.
1-12 DSTni-XPress DR User Guide
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