RS-232 Cables and Connector Options
53
RJ-45 to DB-25 Conversion
Figure 32
RJ-45 to DB-25 “Cable Leg”
RJ-45 - 10 Pin
DB-25
Shell
2
3
4
5
6
7
8
20
22
Chassis Ground
TxD
RxD
RTS
CTS
DSR
Signal Ground
DCD
DTR
RI
1
2
3
4
5
6
7
8
9
10
RI
DSR
RTS
Chassis Ground
TxD
RxD
Signal Ground
CTS
DTR
DCD
Pin
Pin
Signal
Signal
Table 11
Cable Leg Options and Part Numbers
DB-25 Male
DB-25 Female
DB-9 Male
24 Inch Cables
6102024
6103024
6107024
48 Inch Cables
6102048
6103048
N/A
Since most RS-232 devices are equipped with DB-25 connectors, it is necessary
to buy or build an adapter to transfer the signals to a DB-25 plug. The most
simple and direct approach is to purchase ready-made “Cable Legs” from a
DigiBoard dealer or distributor. These are made with a full 10-pin RJ-45 plug
(which can be difficult to obtain in the retail market), connected via a two or
four foot cable to a DTE-configured DB-25 plug.
The pin configuration of the DB-25 connector on the Cable Leg is identical to
that of the DB-25 connectors on the standard DigiBoard DTE octa cable, and
provides full modem control.
If you don’t need full modem control, you can use one of the many
commercially available RJ-45 to DB-25 adapters. These have both an 8-pin RJ-
45 jack and a DB-25 plug in a housing no larger than that found on a standard
DB-25 plug. The plug and jack are connected within the housing by jumpers
which may be installed by the user in any desired configuration.
