Specifications

Table Of Contents
Chapter 5 EIA-232: RJ-45 to DB-25 23
RJ-45 8-wire ALTPIN terminal/printer cable
Using an 8-pin RJ-45 plug, the following cable wiring supports most serial
terminals or printers with either software or hardware handshaking using
the Digi ALTPIN option.
Most terminals and printers use Request to Send/Clear to Send (RTS/CTS)
for hardware handshaking. The cable shown supports this method.
ALTPIN terminal/printer cable for software (XON/XOFF) or hardware (RTS/CTS)
handshaking
Note: Some terminal or printer manufacturers may use different methods of flow
control. Consult your documentation for specific wiring requirements.
RJ-45 8-pin
(Digi end)
DB-25 male
(terminal/printer)
Signal Pin Pin Signal
DCD*
* ALTPIN must be turned on for pin 1 to be
DCD. 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).
1 connected to 20 DTR
RTS 2 connected to 5 CTS
GND 3
connected (via shield)
to
Shell GND
TxD 4 connected to 3 RxD
RxD 5 connected to 2 TxD
SG 6 connected to 7 SG
CTS 7 connected to 4 RTS
DTR 8 connected to 6+8 DSR+DCD