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36
DigiBoard Intelligent Serial Communications Boards
RJ-45 Equipped Boards
The simplest way to connect a modem to a board with RJ-45 connectors is to use
RJ-45 to DB-25 “Cable Legs”, available from DigiBoard (see page 53 for a
description and part numbers). These adapters use 10-pin RJ-45 plugs, and
therefore provide full modem support (Ring Indicator and Data Carrier Detect
are only available on 10-pin RJ-45 connectors).
Figure 19
RJ-45 to DB-25 Modem Cable (10 Wire)
RJ-45 - 10 Pin
DB-25 Male
1
2
3
4
5
6
7
8
9
10
Pin
Pin
RI
DSR
RTS
GND
TxD
RxD
SG
CTS
DTR
DCD
RI
DSR
RTS
GND
TxD
RxD
SG
CTS
DTR
DCD
Signal
22
6
4
1
2
3
7
5
20
8
Signal
( Cable Shield)
If you wish to build your own modem cable, follow the diagram in Figure 19.