Comtrol Cable - Manual (Page 21)

Building Cables for DeviceMaster Products [Documentation number: 2000430 Rev B] 21
DB9 Null-Modem Cable
DB9 Null-Modem
Cable You need a null-modem cable to connect to DTE devices. For example, you can
connect one end of a null-modem cable to COM2 of one computer and the other end
of the null-modem cable to COM2 of another computer.
RS-232 Null-Modem
Cable The following image displays the pinouts for an RS-232 null-modem cable. You
need a null-modem cable to connect to DTE devices.
Note: You can also attach a null-modem adapter to one end of a straight-through
cable to create a null-modem cable.
RS-422 Null-Modem
Cable The following image displays the pinouts for an RS-422 null-modem cable.
Important: RS-422 pinouts are not standardized. Each peripheral
manufacturer uses different pinouts. Please refer to the document
for the peripheral device to determine the pinouts for the signals
in the previous picture.
DB9 Straight-
Through Cable Straight-through cables connect modems to other DCE devices. For example, you
can connect on end of the straight-through cable to COM2 on a computer and the
other end of the straight-through cable to a modem.
RS-232 Straight-
Through Cable for
DeviceMaster Serial
Hub The following image displays the pinouts for an RS-232 straight-through cable.
De
vic
eMast
e
r
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
Fe
m
a
le
DB9
3
2
7
8
6
5
1
4
Pins
RJ45
5
4
1
3
6
7
Pins
2
8
D
e
vic
eMaster
TxD+
TxD-
RxD+
Signal
Fe
m
a
le
DB9
7
3
8
Pins
RxD+
RxD-
Signal
TxD+
TxD-
RxD- 2
De
vic
eMa
s
te
r
DB9
1
2
3
4
5
8
6
7
Pins
DCD
RxD
TxD
DTR
GND
CTS
DSR
RTS
Signal
DB9
1
2
3
4
5
8
6
7
Pins
DCD
RxD
TxD
DTR
GND
CTS
DSR
RTS
Signal
Fe
m
a
le
RI 9 9 RI
RJ45
6
5
4
2
3
8
7
1
Pins
N/A
DB25
8
3
2
20
7
5
6
4
Pins
22