Comtrol DM ATS-LNX - Manual (Page 16)

PC104 RocketPort Option 16
DB25 Connectors
DB25 Connectors This illustrates the pinouts for DB25 quad - or octacables.
Building Additional
DB25 Loopback
Plugs Loopback connectors are DB25 female serial port plugs that you can use to test
serial ports. The ATS-LNX is shipped with a a single loopback plug (RS-232/422)
that corresponds to your quad- or octacable type.
Note: You can run loopback tests with minicom.
Wire the following pins together to build additional plugs or replace a missing RS-
232 loopback plug:
• Pins 2 to 3
• Pins 4 to 5 to 22
• Pins 6 to 8 to 20
Wire the following pins
together for an RS-422 loopback plug:
• Pins 2 to 3
• Pins 4 to 5
RJ45 Connectors This illustrates the pinouts for RJ45 quad- or octacables.
Building Additional
RJ45 Loopback
Plugs Loopback connectors are RJ45 serial port plugs that can be used to test serial
ports. The ATS-LNX is shipped with a a single loopback plug (RS-232/422) that
corresponds to your quad- or octacable type.
Note: You can run loopback tests with minicom.
• Pins 4 to 5
• Pins 1 to 8
• Pins 2 to 6 to 7
Pin 1 Pin 14
TxD
RxD
RTS
CTS
DSR
Signal Gnd
DCD
DTR
RS-232
Pin 1
Pin 14
Signal Gnd
RS-422
Pin 1 Pin 14
TxD/RxD-
TxD/RxD+-
Signal Gnd
RS-485
RxD+
RxD-
TxD+
TxD-
RI
RS-232 Only
(Back View)
The RS-232 loopback plug also works for RS-422 .
Pin 14
Pin 1
. .
RS-422 Only
(Back View)
Pin 14
Pin 1
RS-232
RTS
DTR
Signal GND
TxD
RxD
DCD
DSR
CTS
Pin 1
RJ45
RS-422
TxD+
Not used
Not used**
TxD-
RxD-
Not used
Not used
RxD+
Pin 1
RJ45
RS-485
TxD/RxD+
Not used
Not used**
TxD/RxD-
Not used
Not used
Not used
Not used
Pin 1
RJ45
** Pin 3 is tied to ground on the board,
but is not used in the cable.
1 8
Plug
Top View
Cable
The RS-232 loopback plug also
works for RS-422.