Interface Box Signals; Db25 Null-Modem Cables (Rs-232) - Comtrol RocketPort INFINITY User Manual

Interface Box
Signals
DB25 Null-Modem
Cables (RS-232)
RocketPort INFINITY User Guide: 2000465 Rev. G
Refer to the manufacturer's installation documentation if you need help with the
connector pinouts or cabling for the serial device.
DB25 Female (Standard Interface Box) and
DB 25 Male (Surge Interface Box)
Pin 13
Pin 25
Female
Pin RS-232
1 Not used
2 TxD
3 RxD
4 RTS
5 CTS
6 DSR
7 SIG GND SIG GND
8 DCD
15 CTS
17 RxD
19 RTS
20 DTR
21 Not used
22 RI
23-24 Not used
25 TxD
Ground must be tied to signal ground.
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.
Connector Signals
Pin 1 Pin 1
Pin 14 Pin 14
RS-485
RS-422
(Full-Duplex)
Not used Not used
TxD- TxD-
RxD- RxD-
TxD+ TxD+
RxD+ RxD+
Not used Not used
SIG GND
Not used Not used
RxD+ RxD+
RxD- RxD-
TxD+ TxD+
Not used Not used
Not used Not used
Not used Not used
Not used Not used
TxD- TxD-
RocketPort
DB25
Signal Pins
TxD* 2
RxD* 3
RTS* 4
RI 22
CTS* 5
DSR 6
DCD 8
DTR 20
GND 7
* Interface boxes have alternate pins available for this
signal. Refer to Interface Box Signals for additional
information.
Connecting Serial Devices
Pin 13
Pin 25
Male
RS-485
(Half-Duplex)
Not used
TRxD-
Not used
TRxD+
Not used
Not used
SIG GND
Not used
Not used
Not used
TRxD+
Not used
Not used
Not used
Not used
TRxD-
DTE Serial Device
DB9 DB25
Pins Pins
Signal
2 3 RxD
3 2 TxD
8 5 CTS
9 22 RI
7 4 RTS
4 20 DTR
1 8 DCD
6 6 DSR
5 7 GND
Connecting Serial Devices - 15