Db9 Straight-Through Cables (Rs-232 Or Rs-485 Half-Duplex); Db9 Loopback Plugs - Comtrol RocketPort INFINITY User Manual

DB9 Straight-
Through Cables (RS-
232 or RS-485 Half-
Duplex)

DB9 Loopback Plugs

RocketPort INFINITY User Guide: 2000465 Rev. G
Use the following figure if
you need to build an RS-
232 or RS-485 half-duplex
straight-through cable.
Straight-through cables
are used to connect
modems and other DTE
devices. For example, a
straight-through cable can
be used to connect COM2
of one PC to a modem.
Note: RJ45 connectors are
not standardized.
Refer to your serial
device documentation for signal information.
RocketPort INFINITY models with DB9 connectors on
the interface are shipped with a a single loopback plug
(RS-232/422).
Wire the following pins together to build additional
plugs or replace a missing RS-232/422 loopback plug.
• Pins 1 to 4 to 6
• Pins 2 to 3
• Pins 7 to 8 to 9
Wire these pins together if you want to build an RS-422 (only) loopback plug.
• Pins 2 to 3
• Pins 7 to 8
RocketPort
DB9
Pins
Signal
1
DCD
2
RxD
3
TxD or TRxD-
4
DTR
5
GND
6
DSR
7
RTS or TRxD+
8
CTS
RI 9
Connecting Serial Devices
DCE Serial Device
DB9
DB25
Pins
Pins Signal
1 8
DCD
2 3
RxD
3 2
TxD or TRxD-
4 20
DTR
5
7
GND
6
6
DSR
7 4
RTS or TRxD+
8
5
CTS
9 22 RI
RS-232/422 (Back View)
Pin 5
Pin 1
Pin 9
Pin 6
Connecting Serial Devices - 13