Comtrol DeviceMaster DM-2000 Series - DB9 Null-Modem Cables (RS-232); DB9 Null-Modem Cables (RS-422); DB9 Straight-Through Cables (RS-232;485)

DeviceMaster Installation and Configuration Guide: 2000594 Rev. F Connecting Serial Devices - 89
Connecting Serial Devices
DB9 Null-Modem Cables (RS-232)
Use the following figure if you need to build an RS-232 null-modem cable. A null-modem cable is required for
connecting DTE devices.
Note: You may want to purchase or build a straight-through cable and purchase a null-modem adapter.
DB9 Null-Modem Cables (RS-422)
Use the following figure if you need to build an RS-422 null-modem cable.
Note: RS-422 pin outs are not standardized. Each peripheral manufacturer uses different pin outs. Refer to
the peripheral documentation to determine the pin outs for the signals above.
DB9 Straight-Through Cables (RS-232/485)
Use the following figure if you need to build an RS-232 or RS-485 straight-through cable. Straight-through
cables are used to connect modems and other DCE devices. For example, a straight-through cable can be used
to connect COM2 to a modem.
DeviceMaster
TxD
RxD
RTS
CTS
DSR
GND
DCD
DTR
Signal
RxD
TxD
CTS
RTS
DTR
GND
DCD
DSR
Signal
DB9
2
3
8
7
4
5
1
6
Pins
DB25
3
2
4
7
8
6
Pins
20
5
Female
DB9
3
2
7
8
6
5
1
4
Pins
RJ45
5
4
1
3
6
7
Pins
2
8
DeviceMaster
TxD+
TxD-
RxD+
Signal
Female
DB9
7
3
8
Pins
RxD+
RxD-
Signal
TxD+
TxD-
RxD- 2
GND
GND 5
DeviceMaster
DB9
1
2
3
4
5
8
6
7
Pins
DCD
RxD
TxD or TRxD-
DTR
GND
CTS
DSR
RTS or TRxD+
Signal
DB9
1
2
3
4
5
8
6
7
Pins
DCD
RxD
TxD or TRxD-
DTR
GND
CTS
DSR
RTS or TRxD+
Signal
Female
RI 9
9RI
RJ45
6
5
4
2
3
8
7
1
Pins
N/A
DB25
8
3
2
20
7
5
6
4
Pins
22