Cant connect serial console to my CRS125-24G-15

oskarsg · Tue Nov 22, 2016 1:48 am

Hi !

Im trying to access my switch (CRS125-24G-15-RM) from laptop (Lenovo Thinkpad) using serial console.
I ordered two cables :
1) RJ45 <-> DB9 https://cdn.instructables.com/FO1/T7AW/ ... MEDIUM.jpg
2) DB9 (male) <-> USB http://s7d1.scene7.com/is/image/officed ... 50&hei=450

On my linux machine (Ubuntu 16.04 LTS ) i can find log messages that cabel is recognized.

[ 3380.572093] usb 1-4: new full-speed USB device number 13 using xhci_hcd
[ 3380.757306] usb 1-4: New USB device found, idVendor=1a86, idProduct=7523
[ 3380.757313] usb 1-4: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 3380.757317] usb 1-4: Product: USB2.0-Ser!
[ 3380.758255] ch341 1-4:1.0: ch341-uart converter detected
[ 3380.759561] usb 1-4: ch341-uart converter now attached to ttyUSB0

When i try to access serial port using `minicom`

$ minicom -v
minicom version 2.7 (compiled Feb  7 2016)

im using recommended configuration :

115200bit/s, 8 data bits, 1 stop bit, no parity, flow control=none by default.

http://wiki.mikrotik.com/wiki/Manual:First_time_startup

    +-----------------------------------------------------------------------+
    | A -    Serial Device      : /dev/ttyUSB0                              |
    | B - Lockfile Location     : /var/lock                                 |
    | C -   Callin Program      :                                           |
    | D -  Callout Program      :                                           |
    | E -    Bps/Par/Bits       : 115200 8N1                                |
    | F - Hardware Flow Control : No                                        |
    | G - Software Flow Control : No                                        |
    |                                                                       |
    |    Change which setting?                                              |
    +-----------------------------------------------------------------------+

Still i can't see any output in minicom console its black with strange symbols.
I tried to reset switch, restart , power-on-off nothing is helping. Symbols emerge on screen time to time and that's all .

Screenshot from 2016-11-22 01-24-21.png

PS (on my laptop i have only USB 3 ports but i tried same setup from different laptop (with usb 2) with same outcome )

Thanks for help !
//Oskars

rjscomms · Tue Nov 22, 2016 3:18 am

Not sure what the problem is.

I use gtkterm successfully.

oskarsg · Tue Nov 22, 2016 12:06 pm

Same thing with gtkterm, im able to connect switch with command :

sudo gtkterm -p /dev/ttyUSB0 -s 115200

but screen is black with strange symbols showing time to time.

Selection_002.png

rjscomms · Tue Nov 22, 2016 10:42 pm

Can you login using ethernet and double check the speed is set to 115200 under sys-->routerboard-->settings

I use a standard Cisco lead and a cheap Prolific RS232-USB converter with no problems.

Do you have another routerboard with a serial port to try?

oskarsg · Tue Nov 22, 2016 11:45 pm

@rjscomms yes i checked speed is set up to 115200

[admin@MikroTik] /system routerboard settings> print
             baud-rate: 115200
            boot-delay: 2s
        enter-setup-on: any-key
           boot-device: nand-if-fail-then-ethernet
         cpu-frequency: 600MHz
         boot-protocol: bootp
   enable-jumper-reset: yes
   force-backup-booter: no
           silent-boot: no
  protected-routerboot: disabled

but i found problem !!!
problem is in DB9 to usb converter i borrowed pl2303 and it worked like charm !

any way thanks for help

Cant connect serial console to my CRS125-24G-15

Cant connect serial console to my CRS125-24G-15

Re: Cant connect serial console to my CRS125-24G-15

Re: Cant connect serial console to my CRS125-24G-15

Re: Cant connect serial console to my CRS125-24G-15

Re: Cant connect serial console to my CRS125-24G-15

Who is online