Comtrol RocketPort Universal PCI - Manual (Page 14)

14 - Connecting Serial Devices RocketPort Universal PCI User Guide: 2000284 Rev. G
Connecting Serial Devices
DB25 Serial Cables and Loopback Plugs
The following figures and table illustrate the signals present on DB25
connectors if you need to build your own null-modem or straight-through
serial cables. Refer to the manufacturer’s installation guide if you need help
with connector pinouts or cables for the peripheral device.
• DB25 Signals
• DB25 Null-Modem Cables
• DB25 Straight-Through Cables (RS-232)
• DB25 Loopback Plugs on Page 16
DB25 Signals This subsection provides DB25 signal information. Refer to the manufacturer’s
installation documentation if you need help with the connector pinouts or cabling
for the serial device.
Standard interface modules use female DB25 connectors, while the Surge
interface boxes, Quadcable, and Octacable fanouts use male connectors.
This table shows connector information for DB25 connectors.
Interface Boxes Quad/Octacable
Pin RS-232 Signal RS-422 Signal* RS-232 Signal
1 Not used Not used Not used
2 TxD Not used TxD
3 RxD Not used RxD
4 RTS Not used RTS
5 CTS Not used CTS
6 DSR Not used DSR
7 Signal ground Signal ground Signal ground
8 DCD Not used DCD
9 to 14 Not used Not used Not used
15 Not used RxD+ Not used
16 Not used Not used Not used
17 Not used RxD- Not used
18 Not used Not used Not used
19 Not used TxD+ Not used
20 DTR Not used DTR
21 Not used Not used Not used
22 Not used Not used RI**
23-24 Not used Not used Not used
25 Not used TxD- Not used
* Quad/Octacables do not support RS-422 mode. RS-422 is only available
if you purchased an RS-422 interface box or RS-232/422 interface box.
** RI is only supported on Quad/Octacable adapters.
Pin 13 Pin 1
Pin 25 Pin 14
DB25 Female
Pin 14 Pin 25
Pin 1 Pin 13
DB25 Male
Standard Interface Boxes
Surge Interface Boxes
Quad/Octacable