when use minicom, received "Device /dev/ttyS1 access failed: Permission denied."
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My currently setting for serial port is:
Serial Device : /dev/ttyS1
Bps/Par/Bits : 9600 8N1
Hardware Flow Control : No
Software Flow Control : No
and I use Prolific PL2303 USB adapter for connection, and here is
the last couple line from dmesg output:
usb 5-1: new full speed USB device using uhci_hcd and address 2
usb 5-1: New USB device found, idVendor=067b, idProduct=2303
usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 5-1: Product: USB-Serial Controller
usb 5-1: Manufacturer: Prolific Technology Inc.
usb 5-1: configuration #1 chosen from 1 choice
usbcore: registered new interface driver usbserial
USB Serial support registered for generic
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial Driver core
USB Serial support registered for pl2303
pl2303 5-1:1.0: pl2303 converter detected
usb 5-1: pl2303 converter now attached to ttyUSB0
usbcore: registered new interface driver pl2303
pl2303: Prolific PL2303 USB to serial adaptor driver
After I search some other forum, I found out my problem is caused by:
1. because I use USB converter, so on Serial Device need to specify: /dev/ttyUSB0 instead of /dev/ttyS0
2. for Cisco Catalyst 2950 it needs a roll-over cable connection
3. Bps/Par/Bits : 9600 8N1
After that, my connection is up and running, so please close my case.