Pin Circuit Function




Дата канвертавання24.04.2016
Памер24.51 Kb.

RJ45 Shielded (standard) port pinout
CS9000, Jetstream 4000 + 8500, Lanstream 2000, RTA8/RJX, RRC16, MTA8/RJX & SXDC8/RJX



Pin Circuit Function

1 DCD Input Data Carrier Detect

2 DSR Output Data Set Ready

3 DTR Input Data Terminal Ready

4 S/GND Signal Ground

5 TXD Output Transmit Data

6 RXD Input Receive Data

7 CTS Output Clear To Send

8 RTS Input Request To Send

Shield P/GND Protective (Chassis) Ground




Loopback cable

DCD 1 __


DSR 2 __|

DTR 3 __|

TXD 5 __

RXD 6 __|

CTS 7 __

RTS 8 __|



RJ45 to DB25 JS8500/LS2000/CS9000 console cable configuration

RJ45 DB25 console


DTR 2 --------------------- 20 DTR

GND 4 --------------------- 7 GND

TXD 5 --------------------- 2 TXD

RXD 6 --------------------- 3 RXD

Do not connect other signals.

RJ45 to DB9 JS4000 console cable configuration

RJ45 DB9 Console port


S/GND 4 --------------------- 5 S/GND

TXD 5 --------------------- 3 RXD

RXD 6 --------------------- 2 TXD

Do not connect other signals



RJ45 to DB9 PC Com Port configuration

RJ45 DB9 Com Port


DCD 1 --------------------- 1 DCD

DSR 2 --------------------- 6 DSR

DTR 3 --------------------- 4 DTR

S/GND 4 --------------------- 5 S/GND

TXD 5 --------------------- 2 RXD

RXD 6 --------------------- 3 TXD

CTS 7 --------------------- 8 CTS

RTS 8 --------------------- 7 RTS



RJ45 to RJ45 Null Modem Cable

RJ45 RJ45


DCD 1 ------------------------ 3 DTR

DSR 2 __|

DTR 3 ------------------------ 1 DCD

|___ 2 DSR

S/GND 4 ------------------------ 4 S/GND

TXD 5 ------------------------ 6 RXD

RXD 6 ------------------------ 5 TXD

CTS 7 ------------------------ 8 RTS

RTS 8 ------------------------ 7 CTS

RJ45 to DB9 null modem cable

RJ45 Server DB9


TXD 5 --------------------- 2 RXD

RXD 6 --------------------- 3 TXD

CTS 7 --------------------- 8 CTS

RTS 8 --------------------- 7 RTS

GND 4 --------------------- 5 GND

DCD 1 --------------------- 6 DSR

DSR 2 __|

DTR 3 --------------------- 1 DCD

|____ 4 DTR

RJ45 to DB25 Terminal cable configuration

For standard terminal operating at slow speeds or using software flow control. A simple 3-pin connection can be used.


RJ45 DB25 Terminal
S/GND 4 --------------------- 7 S/GND

TXD 5 --------------------- 3 RXD

RXD 6 --------------------- 2 TXD


RJ45 to DB25 terminal with hardware flow control

For terminals operating at speeds high than 9600 baud or for terminals which do not support software flow control. Terminal supports DTR flow control.


RJ45 DB25 Terminal
S/GND 4 --------------------- 7 S/GND

TXD 5 --------------------- 3 RXD

RXD 6 --------------------- 2 TXD

CTS 7 --------------------- 5 CTS

RTS 8 --------------------- 20 DTR

RJ45 to DB25 terminal using the modem device

Using the modem device on a local connection ensures that the login process is killed when the terminal is switched off.

This is achieved by wiring the terminals RTS or DTR to the RJ45 DCD.
RJ45 DB25 Terminal
DCD 1 --------------------- 20 DTR or 4 RTS

S/GND 4 --------------------- 7 S/GND

TXD 5 --------------------- 3 RXD

RXD 6 --------------------- 2 TXD




RJ45 to DB25 terminal using the modem device and hardware flow control

Using the modem device on a local connection ensures that the login process is killed when the terminal is switched off. This is achieved by wiring the terminals RTS to the RJ45 DCD.


RJ45 DB25 Terminal
DCD 1 --------------------- 20 DTR or 4 RTS

S/GND 4 ---------------------- 7 S/GND

TXD 5 --------------------- 3 RXD

RXD 6 --------------------- 2 TXD


This example assumes that DTR on the terminal is being used for hardware flow control. If RTS is used for hardware flow control connect DTR on the terminal to DCD on the RJ45 and RTS on the terminal to RTS on theRJ45

RJ45 to DB25 modem cable configuration

RJ45 DB25 Modem


DCD 1 --------------------- 8 DCD

DSR 2 --------------------- 20 DTR

DTR 3 --------------------- 6 DSR

S/GND 4 --------------------- 7 S/GND

TXD 5 --------------------- 2 TXD

RXD 6 --------------------- 3 RXD

CTS 7 --------------------- 4 RTS

RTS 8 --------------------- 5 CTS



DB25 to DB9 modem cable configuration

RJ45 DB9 Modem


DCD 1 --------------------- 1 DCD

DSR 2 --------------------- 4 DTR

DTR 3 --------------------- 6 DSR

S/GND 4 --------------------- 5 S/GND

TXD 5 --------------------- 3 TXD

RXD 6 --------------------- 2 RXD

CTS 7 --------------------- 7 RTS

RTS 8 --------------------- 8 CTS



RJ45 to DB25 Serial Printer cable using software flow control

RJ45 DB25 Serial Printer


S/GND 4 --------------------- 7 S/GND

TXD 5 --------------------- 3 RXD

RXD 6 --------------------- 2 TXD

RJ45 to DB25 Serial Printer cable using hardware flow control

This example is for a printer using the DTR pin for hardware flow control.


RJ45 DB25 Serial Printer
S/GND 4 --------------------- 7 S/GND

TXD 5 --------------------- 3 RXD

RXD 6 --------------------- 2 TXD

RTS 8 -------------------- 20 DTR



RJ45 to DB9 Serial Printer cable using hardware flow control

This example is for a printer using the DTR pin for hardware flow control.


RJ45 DB9 Serial Printer
S/GND 4 --------------------- 5 S/GND

TXD 5 --------------------- 3 TXD

RXD 6 --------------------- 2 RXD

RTS 8 --------------------- 4 DTR



RJ45 to DB9 IBM RS6000 Com Port configuration

RJ45 DB9 Com Port


DSR 2 --------------------- 1 DCD

RXD 6 --------------------- 3 TXD

TXD 5 --------------------- 2 RXD

S/GND 4 --------------------- 5 S/GND

RTS 8 --------------------- 7 RTS

CTS 7 --------------------- 8 CTS




RJ45 to DB25 Sun Server

Here are the 2 main cable pinouts required to connect to Sun servers and workstations.


RJ45 DB25 serial
DTR 3 --------------------- 20 DTR

DSR 2 --------------------- 6 DSR

GND 4 --------------------- 7 GND

TXD 5 --------------------- 3 RXD

RXD 6 --------------------- 2 TXD

CTS 7 --------------------- 5 CTS

|________ 8 DCD

RTS 8 --------------------- 4 RTS



RJ45 to Sun server Netra Port RJ45

RJ45 RJ45 serial


DSR 2 --------------------- 7 DSR

DTR 3 --------------------- 2 DTR

GND 4 --------------------- 4 GND

TXD 5 --------------------- 6 RXD

RXD 6 --------------------- 3 TXD

CTS 7 --------------------- 8 CTS

RTS 8 --------------------- 1 RTS

RJ45 to Sun server Port DB9

RJ45 DB9 serial


DTR 3 ------------ 4 DTR

DSR 2 ------------ 6 DSR

|___ 1 DCD

GND 4 ------------ 5 GND

TXD 5 ------------ 2 RXD

RXD 6 ------------ 3 TXD

CTS 7 ------------ 8 CTS

RTS 8 ------------ 7 RTS



RJ45 to Nokia 400/440 DB9 Com Port
Use RJ45 to DB9 PC pinout (or adapter)

RJ45 to RJ45 Cisco cable with hardware flow control

This example supports both DTR/DSR and RTS/CTS signalling for both routers and switches.


RJ45 RJ45 Console port
DSR 2 --------------------- 7 DSR

DTR 3 --------------------- 2 DTR

S/GND 4 --------------------- 4 GND

TXD 5 --------------------- 6 RXD

RXD 6 --------------------- 3 TXD

CTS 7 --------------------- 8 CTS

RTS 8 --------------------- 1 RTS

RJ45 to DB25 Perle P series router console

RJ45 DB25 console


DTR 2 --------------------- 20 DTR

GND 4 --------------------- 7 GND

TXD 5 --------------------- 3 RXD

RXD 6 --------------------- 2 TXD



RJ45 to RJ45 Perle P series router console

RJ45 RJ45 Console port


DSR 2 --------------------- 3 DTR

S/GND 4 --------------------- 4 GND

TXD 5 --------------------- 6 RXD

RXD 6 --------------------- 3 TXD



RJ45 to DB25 Nortel switch

RJ45 DB25


DCD 1 --------------------- 4 RTS

S/GND 4 --------------------- 7 S/GND

TXD 5 --------------------- 3 RXD

RXD 6 --------------------- 2 TXD

RTS 8 --------------------- 20 DTR
RJ45 to Foundry Big Iron Switch DB9 serial port
RJ45 DB9

S/GND 4 --------------------- 5 S/GND

TXD 5 --------------------- 3 RXD

RXD 6 --------------------- 2 TXD



CTS 7 --------------------- 8 RTS

RTS 8 --------------------- 7 CTS


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