Comtrol DM ATS-NTe - Manual (Page 30)

PC104 RocketPort Option 30
Building Additional DB25 Loopback Plugs
Building Additional
DB25 Loopback
Plugs Loopback connectors are DB25 female serial port plugs that you can use to test
serial ports. The ATS-NTE 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 Test Terminal.
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-NTE 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 Test Terminal.
• Pins 4 to 5
• Pins 1 to 8
• Pins 2 to 6 to 7
Building an RS-485
Test Cable You can use a straight-through cable as illustrated previously, or build your own
cable.
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.
DB9
3
7
Pins
TxD or TRX-
RTS or TRX+
Signal
TxD or TRX-
RTS or TRX+
Signal
RJ45
4
1
Pins
RJ45
4
1
Pins
DB25
2
4
Pins