MotherBoard JCOM to DB9 female By HKL,

Since there is a project to deploy an x86 VyOS as the router, After I install the system and I find out that I can use the console to connect to the system just like other Cisco(H3C) routers rather than using the screen.

However, The Cisco router are using RS232-RJ45 port, and I just spot that the H61 MotherBoard ais using jcom jumper to the DB9 male port. And my USB-RS232 converter is also with the DB9 male port, so I’d like to make a jcom to DB9 female plan.

I just find out some jcom and DB9 information here,

JCOM jumper on the motherboard

② RXD	④ DTR	⑥ DSR	⑧ CTS	EMPTY
① DCD	③ TXD	⑤ GND	⑦ RTS	⑨ RI

JCOM line

First is red -> -> ->

①DCD ②RXD ③TXD ④DTR ⑤GND ⑥DSR ⑦RTS ⑧CTS ⑨RI

As usual, when communicating via the RS232, a PC is as the DTE, but as I am using the PC being the router, it is becoming the DCE, so it’s essential to switch the RXD and TXD.

Front view

Back view

Finally, it works well with the Vyos Serial Console Mode.

VyOS Serial Console GRUB

VyOS Serial Console Systemctl

VyOS Serial Console System

The VyOS Router

Ref:

https://wiki.vyos.net/wiki/Serial_console

https://help.ubuntu.com/community/SerialConsoleHowto

http://www.frontx.com/pro/cpx102_2.html