Cisco Console RJ45 to DB9 Cable Pinout details

The console port on Cisco IOS Routers or Switches is asynchronous serial port. The console port is configured as data terminal equipment (DTE). For Cisco 1000, 1600, 2500, 2600, and 3600 Series Routers, the console port use RJ-45 connectors. Adapters are available for connect RJ45 cable  to PC terminals.

Generally we use the rollover cable +DB9 Terminal Adaptor to connect Router console port to Computer COM port. The below table shows the console port pinouts for the RJ-45 connector and  Pinout details from Rollover RJ45 cable to PC DB9 Female connector. Use this cable to configure a Cisco Router using the Console port on the Router.

Below figure shows the Cisco Console port connectivity with RJ45 Rollover cable + DB-9 Adapter

 

cisco console to PC DB9

 

 

 

console-PC DB9 cable

 

 

 

Cisco Console port – Rollover – DB9 Cable Pinout and Signaling details

This table shows the pinout details for the Cisco Console  RJ45 Port -  DB-9 cable:

Console Port (DTE)

RJ-45-to-RJ-45 Rollover Cable

RJ-45-to-DB-9 Terminal Adapter

Console Device

Signal RJ-45 Pin RJ-45 Pin DB-9 Pin Signal
RTS 1 8 8 CTS
DTR 2 7 6 DSR
TxD 3 6 2 RxD
GND 4 5 5 GND
GND 5 4 5 GND
RxD 6 3 3 TxD
DSR 7 2 4 DTR
CTS 8 1 7 RTS

 

Cisco console RJ45 – DB9 cable pinout  and signaling details

This table shows the pinout details for the Cisco console RJ45 – DB9 cable:

RJ45

DB9

RTS 1 8 CTS
DTR 2 6 DSR
TXD 3 2 RXD
GND 4 5 GND
GND 5 5 GND
RXD 6 3 TXD
DSR 7 4 DTR
CTS 8 7 RTS
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  1. Venky says:

    nice post, it is very useful for me to understand Cisco console RJ45 to DB9 converter.

  2. George says:

    Thanks for sharing cisco console RJ45 to DB9 converter pintout details

  3. Gupta says:

    I am using Cisco console RJ45 to db9 converter to configure cisco devices but now understand signaling between them also. thanks.

  4. Ram says:

    nice post on Cisco console cable pinout details

  5. Yebri says:

    Hello!Thanks for DB9 to Cisco Console pinout details! Just wanted to say I love reading through your blog and look forward to all your posts! Carry on the great work!

  6. Javed says:

    Thank you, very informative post on Cisco Console RJ45 to DB9 cable pinout details. You’re so intelligent.

  7. Smith says:

    Using an RJ45 Adapter to Connect to a DB9 Connector
    In some situations it is necessary to interface the RS232 or RS485 signals to RJ45, terminal strips or other physical connections. The Digi radio modem has the RS232 and RS485/422 signals available on a DB9 connector. To facilitate adapting the DB9 connector interface to work with other physical connection types Digi offers RJ45 to DB9 adapters.

    These adapters are shipped unassembled so that they may be put together to accommodate the needs of the application. Two adapters are available:

    DB9 Male to RJ45 connector, Yellow adapter (p/n:JE1D2-CDA-A)
    DB9 Female to RJ45 connector, Green adapter (p/n:JE1D3-CDA-A)

    Wire color (Adapter) RJ45 pin # Wire color (Ethernet cable – EIA/TIA 568B )
    Blue 1 White/Orange
    Orange 2 Orange
    Black 3 White/Green
    Red 4 Blue
    Green 5 White/Blue
    Yellow 6 Green
    Brown 7 White/Brown
    White 8 Brown

    An example application for these adapters would be to extend the RS232 serial connection so that the radio modem might be located closer to the antenna location so that the antenna cable will be as short as possible.

    To build a 3-wire RS232 serial cable ( 3-wire refers to the three signals: RXD, TXD and GND), use a standard CAT-5 networking cable to act as the extension between the computer and the radio modem. (This cable will be carrying RS232 signals, not ethernet signals.)

    Assemble both the yellow and green adapter according to this table:

    DB9 pin RS-232 Signal Name Wire color (Adapter) RJ45 pin # Wire color (Ethernet cable)
    2 RXD Yellow 6 Green
    3 TXD Green 5 Blue/White
    5 GND Red 4 Blue

    When the adapters are assembled, test the cable by attaching the loopback plug into the yellow adapter and the CAT-5 cable, and the green one into the PC and the CAT-5 cable.
    Use the loopback test in the XCTU software to determine that packets can be transmitted correctly.
    Remove the loopback adapter and attach the radio modem.

    To build an 8-wire RS232/RS485 serial cable for use with the Nema-4 enclosure, use a standard CAT-5 networking cable to act as the extension between the computer and the radio modem. (This cable will be carrying RS232 signals, not ethernet signals.)

    Assemble both the yellow and green adapter according to this table:

    DB9 pin RS-232 Signal Name RS-485 Signal Name Wire color (Adapter) RJ45 pin # Wire color (Ethernet cable)
    1 DCD Orange 2 Orange
    2 RXD TX- Red 4 Blue
    3 TXD RX- Yellow 6 Green
    4 DTR Blue 1 White/Orange
    5 GND GND White 8 Brown
    6 DSR - - -
    7 RTS RX+ Black 3 White/Green
    8 CTS TX+ Green 5 White/Blue
    9 PWR(RI) PWR* Brown 7 White/Brown

    When the adapters are assembled, test the cable by attaching the loopback plug into the yellow adapter and the CAT-5 cable, and the green one into the PC and the CAT-5 cable.
    Use the loopback test in the X-CTU software to determine that packets can be transmitted correctly.
    Remove the loopback adapter and attach the radio modem.

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