Comtrol RocketPort Universal PCI - Manual (Page 16)

16 - Connecting Serial Devices RocketPort Universal PCI User Guide: 2000284 Rev. G
Connecting Serial Devices
DB25 Loopback
Plugs A loopback plug is a DB25 serial port plug with pins wired together. You can use a
loopback plug with application software (for example, Test Terminal) to test serial
ports.
RS-232 Female
Loopback Plug The Surge RS-232/422 switchable interface box,
Quadcable, and Octacable use the RS-232 female
loopback plug. To build a DB25 loopback plug for a
Surge interface box, Quadcable, or Octacable, wire
the following pins together:
• Pins 2 to 3
• Pins 4 to 5 to 22
• Pins 6 to 8 to 20
RS-422 Female
Loopback Plug To build a DB25 loopback plug (Surge RS-232/422
switchable interface box) for an RS-422 serial
connection, wire the following pins together:
• Pins 15 to 19
• Pins 17 to 25
RS-232 Male
Loopback Plug The RS-232 and RS-232/422 interface boxes (8-port
and 16-port models) use the RS-232 male loopback
plug. To build a DB25 loopback plug for an RS-232
serial connection, wire the following pins together:
• Pins 2 to 3
• Pins 4 to 5 to 22
• Pins 6 to 8 to 20
RS-422 Male
Loopback Plug To build a DB25 loopback plug for an RS-422 serial
connection, wire the following pins together.
• Pins 15 to 19
• Pins 17 to 25
Pin 13 Pin 1
RS-232 Only (Back View)
Pin 14 Pin 25
Pin 25 Pin 14
Pin 13 Pin 1
RS-422 Only (Back View)
Pin 13 Pin 1
Pin 14 Pin 25
RS-232 Only (Back View)
Pin 25 Pin 14
Pin 1 Pin 13
RS-422 Only (Back View)