Comtrol RocketPort EXPRESS - Manual (Page 14)

14 - Connecting Serial Devices RocketPort EXPRESS User Guide: 2000481 Rev. E
DB25 Serial Cables and Loopback Plugs
DB25 Serial Cables and Loopback Plugs
This section describes DB25 cables and loopback plugs for the following models:
• Fan-out Cable Signals (quadcable and octacable)
• Interface Box Signals on Page 15 (standard and surge models)
• DB25 Null-Modem Cables (RS-232) on Page 15
• DB25 Null-Modem Cables (RS-422 or RS-485 Full-Duplex) on Page 16
• DB25 Straight-Through Cables (RS-232 or RS-485 Half-Duplex) on Page 16
• DB25M: Fan-out Cable Loopback Plugs on Page 16
• DB25F: Standard Interface Box on Page 16
• DB25M: Surge Interface Box Loopback Plugs on Page 17
Note: Refer to the manufacturer’s installation documentation if you need help
with connector pinouts or cabling for the serial device.
Fan-out Cable
Signals Refer to the manufacturer’s installation documentation if you need help with the
connector pinouts or cabling for the serial device.
DB25 Male Connector Signals (Quad/Octacables)
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
9 to 19 Not used Not used Not used Not used
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
23-25 Not used Not used Not used Not used
† Pin 7 is tied to ground on the board, but is not used in the cable.
Pin 14 Pin 25
Pin 1 Pin 13