Specifications

Table Of Contents
26 Chapter 5 EIA-232: RJ-45 to DB-25
RJ-45 10-pin plug to DB-25 modem cable
The simplest way to connect a modem to a Digi RJ-45 jack is to use a
Digi RJ-45 to DB-25 Cable Adapter. The following table shows how to
apply the adapter wiring scheme to custom modem cables.
RJ-45 to DB-25 modem cable (10-wire)’
RJ-45
(Digi end)
DB-25 male
(modem end)
Signal Pin Pin Signal
RI 1 connected to 22 RI
DSR 2 connected to 6 DSR
RTS 3 connected to 4 RTS
GND 4 connected (via shield) to 1 (or shell) GND
TxD 5 connected to 2 TxD
RxD 6 connected to 3 RxD
SG 7 connected to 7 SG
CTS 8 connected to 5 CTS
DTR 9 connected to 20 DTR
DCD 10 connected to 8 DCD