
Chapter 6 EIA-232: RJ-45 to DB-25 21
Digi RJ-45 Connector Pin Assignments
10 pin RJ-45 plugs may be difficult to obtain in the retail market; therefore,
most Digi device driver software incorporates an optional feature called
ALTPIN, which swaps the logical functions of DSR (Data Set Ready) with
DCD (Data Carrier Detect).
When ALTPIN is enabled, DCD becomes available on pin 1 of an 8 pin RJ-
45 connector (equivalent to pin 2 of a 10 pin connector).
RJ Connector Types
The following table shows the relationship of various RJ plugs to the Digi
RJ-45 10 pin jack. The Digi 10 pin jack can accept any of the listed plug
types. The wiring of each plug type corresponds to support of specific
capabilities such as software handshaking, hardware handshaking, and the
Digi ALTPIN feature.
Chapter 4
EIA-232: RJ-45 to DB-25
Signal Description DTE Use Pin #
RI Ring Indicator Input 1
DSR (DCD
a
)
a.When ALTPIN is in effect.
Data Set Ready (Data Carrier Detect
a
) Input 2
RTS Request to Send Output 3
GND Chassis Ground N/A 4
TxD Transmitted Data Output 5
RxD Received Data Input 6
SG Signal Ground reference 7
CTS Clear to Send Input 8
DTR Data Terminal Ready Output 9
DCD (DSR
a
) Data Carrier Detect (Data Set Ready
a
) Input 10
Digi 10 pin
Jack
Signal Name
RJ-4510 pin
Plug
RJ-45 8 pin
Plug
RJ-11 6-Pin
Plug
RJ-11 4-Pin
Plug
1RI 1
2
DSR (DCD*)
*When ALTPIN is in effect.
21
3RTS 321
4GND 4321
5TxD 5432
6RxD 6543
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