Comtrol RocketPort INFINITY - Manual (Page 15)

RocketPort INFINITY User Guide: 2000465 Rev. E 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)
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 Gnd Not used† Not used† Not used†
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-
† Pin 7 is tied to ground on the board, but is not used in the cable.
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.