Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Reading data from a serial port
Operating Systems Linux Debian Reading data from a serial port Post 302919723 by Meow613 on Friday 3rd of October 2014 11:28:14 AM
Old 10-03-2014
Reading data from a serial port
Dear List -

I am trying to capture data from a serial port and write it to a file.
Code:
/var/www$ cat /dev/ttyS0 > scale_value.html 
cat: /dev/ttyS0: Device or resource busy 

/var/www#  cat /proc/tty/driver/serial 
serinfo:1.0 driver revision: 

0: uart:16550A port:000003F8 irq:4 tx:90 rx:270 brk:2 RTS|CTS|DTR|DSR|CD 
1: uart:16550A port:00001C90 irq:17 tx:19 rx:0 CTS|DSR|CD 
2: uart:unknown port:000003E8 irq:4 
3: uart:unknown port:000002E8 irq:3 

/var/www# cat /proc/interrupts 
           CPU0       CPU1 
  0:         42          0   IO-APIC-edge      timer 
  1:          3          0   IO-APIC-edge      i8042 
  4:         74         89   IO-APIC-edge      serial 
  6:          2          1   IO-APIC-edge      floppy 
  8:          0          1   IO-APIC-edge      rtc0 
  9:          1          2   IO-APIC-fasteoi   acpi 
 12:          5          0   IO-APIC-edge      i8042 
 16:     148679     155632   IO-APIC-fasteoi   uhci_hcd:usb1, uhci_hcd:usb4, ehci_hcd:usb7 
 17:          9          8   IO-APIC-fasteoi   uhci_hcd:usb2, uhci_hcd:usb5, i801_smbus 
 18:        131        143   IO-APIC-fasteoi   uhci_hcd:usb3, ehci_hcd:usb6, uhci_hcd:usb8 
 40:   54993721          0  HPET_MSI-edge      hpet2 
 41:          0   53507648  HPET_MSI-edge      hpet3 
 42:    1041026     920449   PCI-MSI-edge      eth0 
 43:     524549     476624   PCI-MSI-edge      ahci 
 44:         11          9   PCI-MSI-edge      mei_me 
 45:      46800      46570   PCI-MSI-edge      i915 
 46:       1488       1583   PCI-MSI-edge      snd_hda_intel 
NMI:      37245      37177   Non-maskable interrupts 
LOC:         16         12   Local timer interrupts 
SPU:          0          0   Spurious interrupts 
PMI:      37245      37177   Performance monitoring interrupts 
IWI:     258822     264271   IRQ work interrupts 
RTR:          0          0   APIC ICR read retries 
RES:    5271209    5278411   Rescheduling interrupts 
CAL:        433        693   Function call interrupts 
TLB:    2917013    2903216   TLB shootdowns 
TRM:          0          0   Thermal event interrupts 
THR:          0          0   Threshold APIC interrupts 
MCE:          0          0   Machine check exceptions 
MCP:       1061       1061   Machine check polls 
ERR:          0 
MIS:          0 

/dev/ttyS1, Line 1, UART: 16550A, Port: 0x1c90, IRQ: 17 
    Baud_base: 115200, close_delay: 50, divisor: 0 
    closing_wait: none 
    Flags: spd_normal skip_test 

/var/www#  setserial /dev/ttyS0 -a 
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x03f8, IRQ: 4 
    Baud_base: 115200, close_delay: 50, divisor: 0 
    closing_wait: 3000 
    Flags: spd_normal skip_test

How do I get rid of the busy message?

TIA

Ethan

Moderator's Comments:
Mod Comment Please use code tags next time for your code and data. Thanks
 

9 More Discussions You Might Find Interesting

1. Programming

Reading incoming data in serial ports

Hi every body, i have the following problem : I need to read incoming data from a serial port, this port has connected a weigth device to it that send the weigth and i need to read this data to my aplication, i had this problem in Window Enviroment and i resolve with a "C" routine, but in Unix... (1 Reply)
Discussion started by: jricardorm
1 Replies

2. Programming

serial port reading

Hai there, Can any one provide me with a ansi c source code for opening com1 or com2 and read data. The port is connected to another serial communication device on rs232 port. The o/s is Sco Unix 5.0.6 Matter urgent Viswanath (0 Replies)
Discussion started by: viswanath
0 Replies

3. SCO

data transfer from serial port

dear sir, pls. can you help me ? , my os is unix sco 5.0.4 and ,server dat derive (1,4gb) not working, now i want to transfer my server data in other machine (unix/other possible) by serial port/other port comminication. thanks pankaj raval (2 Replies)
Discussion started by: pankajbraval
2 Replies

4. Solaris

Serial port on the T5140

What is the serial port on the T5140 used for. (4 Replies)
Discussion started by: pgsanders
4 Replies

5. Shell Programming and Scripting

Need help with serial port

Hi, I have a external board connected to my serial port. I need to execute "shutdown -r now" command when system boot up. When system boots up it requires a username ans password. Then I need to run my command. I can use rc script but that is rebooting system before it asks for username and... (0 Replies)
Discussion started by: charlie.arya
0 Replies

6. Solaris

How to enable Serial port on ILOM, when Network Port is enabled in parallel

Hi Everyone, In my environment, I have few T5220. On the iLOM Management Card, I have both Network and Serial port are cabled, I don't have any issues while I try to connect using Network Management port, but when I try to connect the serial port for the same server which is actually connected... (3 Replies)
Discussion started by: bobby320
3 Replies

7. Shell Programming and Scripting

reading from and writing to serial port

hello all, please any one can provide me the shell script to write data to /dev/ttyS1 and read responce from /dev/ttyS1 and compare the responce to some string .. thnxx ---------- Post updated at 03:35 PM ---------- Previous update was at 11:46 AM ---------- any body help me.. how do i... (1 Reply)
Discussion started by: yashwantkumar
1 Replies

8. Programming

Wrong data with Read from a serial port.

hi, I've a problem on my C/C++ program with Posix Library. I have to read data from the serial but I have incorrect data, in fact I get a bunch of zeros: "2953.3174, 2785.2126, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0 , 0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ,... (24 Replies)
Discussion started by: enaud
24 Replies

9. Solaris

Cabling and adapters to communicate to service processor serial port from Windows PC with USB port.

Hello, I have an unloaded T5140 machine and want to access the ILOM for the first time and subsequently the network port after that., and then load Solaris 10 the final January 2011 build. The first part is what confuses me -the cabling. I am coming from a Windows machine (w/appropriate... (5 Replies)
Discussion started by: joboy
5 Replies
All times are GMT -4. The time now is 02:54 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy