Linux Dev Ttys0 Input Output Error
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Tty Input/output Error
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Cat /dev/ttys0 Input/output Error
and rise to the top cat /dev/ttyS0 Input/output error up vote 2 down vote favorite I created infrared receiver as in LIRC manual (http://www.lirc.org/receivers.html). And tested it on windows using program called Terminal. When I switched on RTS pin DCD pin was also switched on and when I used remote controll DCD was blinking. So everything works with hardware. Next I tried using the same hardware on Linux Mint 17 on same computer linux serial port as in http://lifehacker.com/5527752/control-your-desktop-pc-with-a-remote-using-lirc but with no luck: piotrek-H87-HD3 piotrek # cat /dev/ttyS0 cat: /dev/ttyS0: Input/output error I also followed http://www.commandlinefu.com/commands/view/10218/ttys0-terminal-on-serial-connection. In this tutorial there was the same error I had so I tried looking in BIOS setup but serial ports were enabled. Why isin't it working? Some information data: piotrek-H87-HD3 piotrek # cat /proc/tty/driver/serial serinfo:1.0 driver revision: 0: uart:16550A port:000003F8 irq:4 tx:0 rx:0 1: uart:unknown port:000002F8 irq:3 2: uart:unknown port:000003E8 irq:4 3: uart:unknown port:000002E8 irq:3 4: uart:16550A port:0000F080 irq:19 tx:34 rx:0 CTS|DSR|CD 5: uart:unknown port:00000000 irq:0 6: uart:unknown port:00000000 irq:0 7: uart:unknown port:00000000 irq:0 8: uart:unknown port:00000000 irq:0 ... //EDIT I was wondering lately if maybe linux somehow switched pin layout of my serial port? My motherboard COM port pins layout is : I have back panel extension cord which maps 1:1 pin layout from motherboard to back panel like this: ------------------- \ [1][3][5][7][9] / \ [2][4][6][8] / \ ___________ / In windows pin order is same as in motherboard manual. Is it possible that pins are switched somehow? Can I check it? Nobody seems to know the answer so maybe I ask another question. Can I write some script (python maybe?) that will enable selected pins on /dev/ttyS0 so I could measure voltage and check which pin is which? tty cat serial-port serial-console share|improve this que
port General support questions including new installations Post Reply Print view Search Advanced search 9 posts • Page 1 of 1 mahlenius Posts: 28 Joined: 2007/11/06 minicom 20:13:50 configuring /dev/ttyS0 port Quote Postby mahlenius » 2008/02/02 21:09:37 Hi,my /dev/ttyS0 getty port is not working - as far as I can tell. This is the only serial port on this machine (Dell tower)This is the first time I have tried to use it on this machine and I cannot get it working. I have used minicom and it won't http://unix.stackexchange.com/questions/192075/cat-dev-ttys0-input-output-error communicate to my external device. On my laptop, which is also running Centos 5, the port works fine to my external device. I have the same minicom port settings (speed, baud,,etc), but itstill will not work.Is there anything else I need to do to enusre the port is setup in the OS for usage?I did try to do a setserial cmd, http://www.centos.org/forums/viewtopic.php?t=10753 but got:# setserial -a /dev/ttyS0Cannot get serial info: Invalid argumentnot sure if this helps, but something does not seem right....thanks'mark Top AlanBartlett Forum Moderator Posts: 9296 Joined: 2007/10/22 11:30:09 Location: ~/Earth/UK/England/Suffolk Contact: Contact AlanBartlett Website configuring /dev/ttyS0 port Quote Postby AlanBartlett » 2008/02/02 22:28:01 Is the port enabled in the BIOS?On my system, with two physical RS-232 ports both enabled in the BIOS, this is what I see:# ls -l /dev/ | grep ttyScrw-rw-rw- 1 root tty 4, 64 Jan 31 10:13 ttyS0crw-rw-rw- 1 root tty 4, 65 Jan 31 10:13 ttyS1crw-rw---- 1 root uucp 4, 66 Jan 31 10:13 ttyS2crw-rw---- 1 root uucp 4, 67 Jan 31 10:13 ttyS3# stty < /dev/ttyS0speed 9600 baud; line = 0;-brkint -imaxbel# stty < /dev/ttyS1speed 9600 baud; line = 0;-brkint -imaxbel# stty < /dev/ttyS2stty: standard input: Input/output error# stty < /dev/ttyS3stty: standard input: Input/output error# This is entirely expected behaviour.HTH.Alan. Top mahlenius Posts: 28 Joined: 2007/11/06 20:13:50 Re: configuring /dev/ttyS0 port Quote Postby mahlenius » 2008/02/02 22:37:39 Hi,I have one follow up to the setserial command. I looked in the /var/log/messages file and f
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and http://stackoverflow.com/questions/31908335/serial-port-dev-ttys0-and-ttys-input-output-error policies of this site About Us Learn more about Stack Overflow the company https://bbs.archlinux.org/viewtopic.php?id=160908 Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a output error minute: Sign up Serial port /dev/ttyS0 and ttys* input output error up vote 0 down vote favorite I'm new to this kind of things so I need help from you guys. When playing around with serial ports, I figured why not echo from one terminal and cat/listen from the other using one of the /dev/ttyS* serial ports on my ubuntu 15.04 linux dev ttys0 laptop. When i do cat /dev/ttyS0 it gives me input output error. then i tried doing it using pyserial on python. when i do import serial ser = serial.Serial('/dev/ttyS0') it gives me SerialException: Could not configure port: (5, 'Input/output error') After looking around on stack overflow, I found this related post Pyserial: could not configure port: (5, 'Input/output error) where one of the guy said you need a physical connection to make this happen. I'm guessing that is to create some kind of loop. So my question is what kind of physical connection is required? Who a usb stick do it, or do i need something dedicated to work with the serial port. And if someone would provide good explanation on how serial port programming works, that would be great. Feel free to edit the question where you see fit. Guys please no need to complain about how dumb this question sounds and all that. After all lots of people come here to learn, and that is what i am doing python linux ubuntu serial-port pyserial share|improve this question asked Aug 9 '1
1 #1 2013-04-05 14:35:39 Hexorg Member Registered: 2009-02-23 Posts: 27 [Solved] Using serial port (can't start communication) Hello everyone. I'm trying to connect to a switch through a built-in to motherboard serial port using minicom. I have arch running on vanilla kernel. `zgrep -i serial /proc/config.gz` tells me that CONFIG_SERIAL_8250=y, but `dmesg | grep tty` shows only tty0 active. I can't see anything serial port related with neither lspci, lshw, nor lsusb.I do have /dev/ttyS[0-3] but if I try to cat any of them it gives me input/output error. `setserial /dev/ttyS0` says "/dev/ttyS0, UART: unknown, Port: 0x03f8, IRQ: 4". Setting uart to 8250 with setserial did not help :-\I also tried starting agetty@ttyS0.service, no luck either.It seems like it *should* work out-of-box. But I can't communicate with the switch :-\Can someone please help me get the serial port working?TL;DR:-> Hardware serial port-> Vanilla kernel-> `dmesg | grep tty` shows only tty0-> `setserial /dev/ttyS0` says "/dev/ttyS0, UART: unknown, Port: 0x03f8, IRQ: 4"-> cat: /dev/ttyS0: Input/output error-> Minicom stays dark.-> Thanks for help! Last edited by Hexorg (2013-04-05 15:12:43) Offline #2 2013-04-05 15:12:08 Hexorg Member Registered: 2009-02-23 Posts: 27 Re: [Solved] Using serial port (can't start communication) Nevermind... Someone had serial port disabled in BIOS... Offline #3 2013-04-05 15:12:38 ewaller Administrator From: Pasadena, CA Registered: 2009-07-13 Posts: 13,582 Re: [Solved] Using serial port (can't start communication) It looks like your system is expecting the serial port to exist on the old ISA bus. Most modern architectures use a LPC (Low Pin Count) bus to provide ISA bus services. The kernel sets up the four legacy MSDOS COM: ports of 0x3f8, 0x2f8, 0x3e8 and 0x02e8 sharing iqq's 3 and 4 and maps them to /dev/ttyS[[0-3]; regardless of whether there is really hardware there.The question is: How is your serial port actually implemented? Do you know for certain that it is implemented as an legacy ISA device ? (Even though the hardware layer may be on the LPC bus?). If it is, is this a BIOS machine? Are th