[arch-general] Connection through USB to TTL Serial Cable

Csányi Pál csanyipal at gmail.com
Wed May 20 19:41:13 UTC 2015

2015-05-20 21:16 GMT+02:00 Ralf Mardorf <ralf.mardorf at rocketmail.com>:
> On Wed, 20 May 2015 12:07:37 -0700, Anatol Pomozov wrote:
>>There are other terminal applications: minicom, com.
> "Other alternatives are screen, picocom and kermit." -
> http://www.jann.cc/2013/02/10/the_cu_command.html

I have now installed uucp and picocom.

However, I can't use these commands: 'cu' 'picocom' because there is no

or such devices,
but only

I tried these commands:
$ cu -s 115200 -l /dev/ttyS0
cu: /dev/ttyS0: Line in use

$ cu -s 115200 -l /dev/ttyS1 # ( also S2, S3 )
cu: Got hangup signal


dmesg gives me no ifnormation about such device:
[36829.865727] Shorewall:net-fw:DROP:IN=enp0s20 OUT=
MAC=00:1a:92:ce:61:70:00:22:02:00:07:3d:08:00 SRC=
DST= LEN=35 TOS=0x00 PREC=0x00 TTL=48 ID=30265 DF
PROTO=UDP SPT=50434 DPT=5093 LEN=15
[38367.939572] usb 2-6: new full-speed USB device number 6 using ohci-pci

Maybe the Shorewall firewall is the culprit in this case?

Regards from Pal

More information about the arch-general mailing list