RocketPort INFINITY User Guide
: 2000465 Rev. G
Connecting Serial Devices - 15
Connecting Serial Devices
Interface Box
Signals
Refer to the manufacturer’s installation documentation if you need help with the
connector pinouts or cabling for the serial device.
DB25 Null-Modem
Cables (RS-232)
Use the following figure if you
need to build an RS-232 null-
modem cable. A null-modem
cable is required for
connecting DTE devices.
You may want to purchase or
build a straight-through cable
and purchase a null-modem
adapter. For example, a null-
modem cable can be used to
connect COM2 of one PC to
COM2 of another PC.
Note:
RJ45 connectors are not
standardized. Refer to
your serial device
documentation for
signal information.
DB25 Female (Standard Interface Box) and
DB 25 Male (Surge Interface Box)
Connector Signals
Pin
RS-232
RS-422
RS-485
(Full-Duplex)
RS-485
(Half-Duplex)
1
Not used
Not used
Not used
Not used
2
TxD
TxD-
TxD-
TRxD-
3
RxD
RxD-
RxD-
Not used
4
RTS
TxD+
TxD+
TRxD+
5
CTS
RxD+
RxD+
Not used
6
DSR
Not used
Not used
Not used
7
SIG GND
SIG GND
SIG GND
SIG GND
8
DCD
Not used
Not used
Not used
15
CTS
RxD+
RxD+
Not used
17
RxD
RxD-
RxD-
Not used
19
RTS
TxD+
TxD+
TRxD+
20
DTR
Not used
Not used
Not used
21
Not used
Not used
Not used
Not used
22
RI
Not used
Not used
Not used
23-24
Not used
Not used
Not used
Not used
25
TxD
TxD-
TxD-
TRxD-
Ground must be tied to signal ground.
Pin 14
Pin 25
Pin 1
Pin 13
Male
Pin 25
Pin 14
Pin 13
Pin 1
Female
TxD*
RxD*
RTS*
CTS*
DSR
GND
DCD
DTR
Signal
RxD
TxD
CTS
RTS
DTR
GND
DCD
DSR
Signal
DB9
2
3
8
7
4
5
1
6
Pins
DB25
3
2
4
7
8
6
Pins
20
5
DB25
2
3
4
5
6
7
8
20
Pins
RI
RI
9
22
22
RocketPort
DTE Serial Device
* Interface boxes have alternate pins available for this
signal. Refer to
Interface Box Signals
for additional
information.