I am trying to connect to the serial console of my MikroTik RB4011iGS+.
I might be missing something obvious, but I can't seem to get a terminal (or anything else).
Relevant documentation page:
My current router configuration pertaining to
/system console and
[admin@MikroTik] > /system console print Flags: X - disabled, U - used, F - free # PORT TERM 0 F serial0 vt102 [admin@MikroTik] > /system console print detail Flags: X - disabled, U - used, F - free 0 F port=serial0 channel=0 term="vt102" [admin@MikroTik] > /port print Flags: I - inactive # DEVICE NAME CHANNELS USED-BY BAUD-RATE 0 serial0 1 Serial Console 115200 1 serial1 1 115200 [admin@MikroTik] > /port print detail Flags: I - inactive 0 name="serial0" used-by="Serial Console" device="" channels=1 baud-rate=115200 data-bits=8 parity=none stop-bits=1 flow-control=none 1 name="serial1" used-by="" device="" channels=1 baud-rate=115200 data-bits=8 parity=none stop-bits=1 flow-control=none
I have also tried working with 9600 baud and using the port
serial1, with the same (lack of) results.
The RouterBoard is connected to my Linux machine running
minicom 2.7, through the following cable connections:
- The RouterBoard contains an RJ45 serial port on the back;
- A straight RJ45 cable is connecting the RouterBoard to a Cisco-style adapter;
- This Cisco-style adapter wires RJ45 to DB9, and I have double-checked with a multimeter that it is appropriately wired (see below);
- Finally, the DB9 end is plugged to a Serial-to-USB cable.
This is the pinout of the Cisco-style adapter, as present on the corresponding MikroTik documentation page:
This is the Serial-to-USB kernel log and
# dmesg (...) [632023.804776] usb 2-2: Product: USB-Serial Controller [632023.804788] usb 2-2: Manufacturer: Prolific Technology Inc. [632023.807327] pl2303 2-2:1.0: pl2303 converter detected [632023.819548] usb 2-2: pl2303 converter now attached to ttyUSB0 # lsusb (...) Bus 001 Device 017: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port (...)
I literally grabbed an old 486 with Windows 95 to make sure the Serial-to-USB cable works fine, and I succeeded in communicating at 9600 baud between HyperTerminal/Win95 and Minicom/Linux using the Serial-to-USB converter and a null-modem cable.
I also tried to plug the Cisco-style adapter directly to the Win95 serial port. I wasn't able to get a terminal on HyperTerminal either.
I also tried to use
picocom and later
screen instead of
minicom. None made any difference.
So, the problem shouldn't be in the adapter (it's wired fine, and I have two of them), nor the RJ45 cable (it does Ethernet just fine), nor the Serial-to-USB converter. However, I don't see anything else I can configure on the router (which I have also rebooted, and nothing showed up in the serial link - not even boot information). I followed all instructions from MikroTik, and even YouTube videos.
I'm now going slightly mad, knowing this is going to be some sort of stupid mistake. What can I possibly be doing wrong?