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Product FAQs

QUESTION

How to connect NPort RJ45 serial port to CISCO console port?

SOLUTION

Please check the following steps to connect the RJ45 serial port from MOXA NPort series to RS-232 console port from CISCO server:  

Option 1:  
You can use the following cable combination if you do not want to create your own RJ45 to RJ45 cable. 

  • Use CISCO RJ45 to DB9 female cable to connect to your CISCO console port

D:\BOUTOND\Pictures\1.jpg

  • Use MOXA RJ45 to DB9 male cable (CBL-RJ45SM9-150 – DB9) to connect to MOXA device  

D:\BOUTOND\Pictures\2.jpg

If communication is working via PC’s hardware COM-Port using the CISCO RJ45 to DB9 cable, it will also work via connecting the CBL-RJ45SM9-150 – DB9 to NPort’s RJ45 serial port. 

Option 2:  
In case you need to make your own RJ45 to RJ45 cable please check the information below. 
You cannot use straight or crossover RJ45 cable due to different pin assignments between MOXA serial RJ45 port and CISCO serial RJ45 console port (see Appendix for pin assignments used). 
Please keep in mind that MOXA can only provide pin assignment for MOXA devices. Please review CISCO pin assignment in CISCO documentation. 

MOXA NPort 

Cable-MOXA side (PIN) 

Cable CISCO side (PIN) 

CISCO console port 

DSR 

DTR 

RTS 

CTS 

GND 

4 or 5* 

GND 

TxD 

RxD 

RxD 

TxD 

DCD 

--- 

--- 

CTS 

RTS 

DTR 

DSR 

 

* CISCO console port provide GND on PIN 4 and PIN 5 
 
Warning:  
Please keep in mind that the cable is not a straight or crossover cable. 

Make sure to connect the RJ45 connector having Moxa pin assignment to Moxa serial port. 

Communication only will work when connecting the cable correctly to the devices. 

  
Appendix 
NPort RJ45 (male) serial port RS-232 pin assignment 

CISCO console port pin assignment used for RJ45 – RJ45 cable

Signal 

Console Port 

RTS 

DTR 

TxD 

GND 

GND 

RxD 

DSR 

CTS 

 

 

Relevant Products

NPort 5600 Series · NPort 6400/6600 Series ·

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