RocketPort EXPRESS User Guide
: 2000481 Rev. G
Connecting Serial Devices - 17
DB25M: Surge Interface Box Loopback Plugs
DB25M: Surge
Interface Box
Loopback Plugs
RocketPort EXPRESS models with DB25 male connectors on the Surge interface
box are shipped with a a single loopback plug (RS-232/422).
Wire the following pins together to build additional
RS-232/422 plugs or replace a missing RS-232/422
loopback plug.
•
Pins 2 to 3 or
alternately
, Pins 17 to 25
•
Pins 4 to 5 to 22 or
alternately
, Pins 15 to 19 to 22
•
Pins 6 to 8 to 20
You can wire the following pins together for an RS-422 only loopback plug.
•
Pins 2 to 3 or
alternately
, Pins 17 to 25
•
Pins 4 to 5 or
alternately
, Pins 15 to 19
RJ45 Serial Cables and Loopback Plugs
This section describes RJ45 cables and loopback plugs for the RocketPort
EXPRESS 4J, Octacable and Rackmount interface boxes.
•
•
RJ45 Null-Modem Cable (RS-232)
•
RJ45 Null-Modem Cable (RS-422 or RS-485 Full-Duplex)
•
RJ45 Straight-Through Cable (RS-232 or RS-485 Half-Duplex)
•
RJ45 Signals
There are no standards for RJ45 connector pinouts. Refer to the
manufacturer’s installation documentation if you need help with
connector pinouts or cabling for the serial device.
Note:
Ring indicator is not supported on the RJ45 connector.
Pin 13
Pin 1
RS-232/422 (Back View)
Pin 14
Pin 25
RJ45 Connector Signals
Pin
RS-232
RS-422
RS-485
(Full-Duplex)
RS-485
(Half-Duplex)
1
RTS
TxD+
TxD+
TRxD+
2
DTR
Not Used
Not Used
Not Used
3
SIG GND
SIG GND
SIG GND
SIG GND
4
TxD
TxD-
TxD-
TRxD-
5
RxD
RxD-
RxD-
Not Used
6
DCD
Not Used
Not Used
Not Used
7
DSR
Not Used
Not Used
Not Used
8
CTS
RxD+
RxD+
Not Used
Ground must be tied to signal ground.