memo for how to use pl2303 usb - serial console cable in linux.

memo for how to use usb - serial console cable in linux.

objectives

• personal memo

system

• Thinkpad X220

 % cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.2 LTS"

procedure

1. check usb port before attaching cable.

 % lsusb
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 147e:2016 Upek Biometric Touchchip/Touchstrip Fingerprint Sensor
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

 % ls -l /dev/ttyUSB*
zsh: no matches found: /dev/ttyUSB*

2. attach usb - serial console cable.

 % dmesg

(snip)

[1555060.547993] usb 2-1.2: new full-speed USB device number 15 using ehci-pci
[1555060.657895] usb 2-1.2: New USB device found, idVendor=067b, idProduct=2303
[1555060.657901] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[1555060.657905] usb 2-1.2: Product: USB-Serial Controller
[1555060.657909] usb 2-1.2: Manufacturer: Prolific Technology Inc.
[1555060.658939] pl2303 2-1.2:1.0: pl2303 converter detected
[1555060.660738] usb 2-1.2: pl2303 converter now attached to ttyUSB0

 % ls -l /dev/ttyUSB*
crw-rw---- 1 root dialout 188, 0 Feb 28 01:29 /dev/ttyUSB0

 % lsusb             
Bus 002 Device 016: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 147e:2016 Upek Biometric Touchchip/Touchstrip Fingerprint Sensor
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

 % lsusb | grep -i --color PL2303   
Bus 002 Device 016: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port

3. connect with screen command

 % sudo screen /dev/ttyUSB0

c3750-1>sh ver
Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.0(1)SE2, RELEASE SOFTWARE (fc3)

(snip)