Login or Register to Ask a Question and Join Our Community


Linux

Urgent - serial port

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Operating Systems Linux Urgent - serial port
# 1  
Old 08-04-2008
Urgent - serial port
Hi All,
I am a begineer in Linux, I have 4 ports and 3 are operational port 1,port 2 and port 4 (when I plug in serial device I can see it working) but port 3 seems it is not working.
I am sure the hardware is fine.

when I give command

dmesg | grep tty

I get,
serial 8250:ttyS0 at I/O 0x3f8 (irq=4)is a 16550A
serial 8250:ttyS1 at I/O 0x2f8 (irq=3)is a 16550A
serial 8250:ttyS2 at I/O 0x3e8 (irq=4)is a 16550A
serial 8250:ttyS3 at I/O 0x2e8 (irq=3)is a 16550A
0:05:ttyS0 at I/O 0x3f8 (irq=4) is a 16550A
0:06:ttyS1 at I/O 0x2f8 (irq=3) is a 16550A
0:09:ttyS3 at I/O 0x2e8 (irq=11) is a 16550A

I also tried setserial -g /dev/ttyS2 but getting the same result

My Qustion is:
1) what is the difference b/w first 4 lines and last three lines and Y is port 3(ttyS2) not getting displayed in b/w last three lines.
2) Is there something I have to do to enable port 3.
2)Please help me out to get the port 3 into working condition


Thanks in advance
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. 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

2. Web Development

Writing to a Serial Port

I am trying to write to a serial port and capture the reponse in a file - adduser ethan dialout The user `ethan' is already a member of `dialout' root@meow:/home/ethan# ls -l /dev/ttyS0 crw-rw-r-- 1 ethan dialout 4, 64 Oct 7 20:55 /dev/ttyS0 $fh1 = fopen("/dev/ttyS0", "w+");... (74 Replies)
Discussion started by: Meow613
74 Replies

3. 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

4. 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

5. UNIX for Dummies Questions & Answers

Missing serial port

A neighbour's Ubuntu 10.04 machine has five serial ports, one on the motherboard and four on a PCI card. However, only four cards are showing: # dmesg | grep tty console enabled serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A 00:08: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A ... (2 Replies)
Discussion started by: dotancohen
2 Replies

6. Programming

Programming serial port

Hello! Can someone advice me which method I will use if I want to communicate with device via RS232 serial port with this requirements: 1. Serial port is opened in non-canonical mode. 2. All the time I need to check is there something to read. 3. If I have to write something I need to write it... (6 Replies)
Discussion started by: jvrlic
6 Replies

7. Solaris

Serial port not found

Hi, I am working with solaris 9,SUN-Blade-100 and I want to communicate with the Serial port.To check whether the port is working or not.I write code and when I execute the file,then I got the output-- According to this,serial port is not found.can anyone please tell me how to configure the... (1 Reply)
Discussion started by: smartgupta
1 Replies

8. Programming

Serial port programming

I am developing an application in c with Linux OS, where a radio modem working at baud rate 9600 will be attached to PC on serial port. More than four such units will be communicating at one time, so there may be jamming or data corruption. Each module will be transmitting Data packets less than... (2 Replies)
Discussion started by: raj8109
2 Replies

9. Linux

urgent......Serial port

I think my serial port(on board) is not working ...... because when I am running same code on two machines its working good....but when my system comes into picture ....it doesnt show any output comming from serial port.......... can anybody tell me how to configure my serial port.........or to... (16 Replies)
Discussion started by: arunchaudhary19
16 Replies

10. UNIX for Dummies Questions & Answers

Serial port communication

We're running SCO Unix Openserver 5.05 and I'm having trouble with serial communication between the com2 serial port and a handheld device. Downloading data from Unix to the handheld works perfectly, but the other way around creates a major problem. I don't know whether it's a buffer overflow or... (1 Reply)
Discussion started by: Aretha
1 Replies
Login or Register to Ask a Question

LEARN ABOUT OSF1

port_names

ports(7)						 Miscellaneous Information Manual						  ports(7)

NAME

       ports, port_names - Device (tty and lp) names for serial and parallel ports

SYNOPSIS

       Default Serial Ports:

       /dev/tty00
       /dev/tty01 (not present on a single-port system)

       Parallel Port:

       /dev/lp0

DESCRIPTION

       AlphaStation  and AlphaServer systems provide one or two 9-pin serial communication ports. These ports are usually labelled 1 (COMM1) and 2
       (COMM2), but they may be identified by different icons.	Using the appropriate serial cable  and  terminator,  you  can	connect  a  serial
       printer,  external  modem, or character-cell terminal to a serial port. Most AlphaStation and AlphaServer systems also provide one parallel
       port, for use with a parallel printer.

       When you add a device to your system, the installation documentation may instruct you to map  the  device  pathname  to	the  port.   These
       devices are located in the /dev directory.

       For  serial-line  ports, the two default device pathnames are: This pathname always maps to 1, COMM1, the lowest port number, an icon for a
       terminal console, or the only serial port (on a single-port system).  This pathname always maps to 2, COMM2, the next numbered port, or (if
       one serial port is labeled with an icon for a terminal console) the remaining serial port.

       If  your system hardware has been extended to include additional serial ports, the pathnames /dev/tty02, /dev/tty03, and so forth, may also
       be available to you. However, most systems have only /dev/tty00 and /dev/tty01 as the device pathnames for serial ports.

       The one parallel port on an AlphaStation or AlphaServer may be labeled with the word printer or a printer icon. On some systems, the paral-
       lel  port may not be labeled.  The device pathname for the parallel port is /dev/lp0. Currently, Tru64 UNIX does not fully support parallel
       printers, so fewer devices are connected to this port as compared to serial ports.

       If you are connecting a terminal console to your system, it must be connected to the serial port mapped to  /dev/tty00.	For  other  serial
       devices,  it does not matter which of the serial ports you choose for the connection. For example, suppose you are setting up a system that
       has two serial ports, labeled 1 and 2. You intend to use a serial-line terminal rather than a workstation monitor as the system console and
       also  want  to  connect	a  serial-line	printer to the system. In this case, you must connect the terminal to the port labeled 1 (with the
       device pathname /dev/tty00). Therefore, you must connect the printer to the remaining port labeled 2 (with the device pathname /dev/tty01).

       If, for the same type of system, you intend to use a workstation monitor as the system console, it does not matter which  serial  port  you
       use  for  a serial-line printer or modem. In other words, you can connect the printer to either port 1 (with pathname /dev/tty00) or port 2
       (with pathname /dev/tty01).  When prompted to enter a /dev/tty** pathname by the lprsetup script or the Print configuration tool in the CDE
       Application Manager, you would specify /dev/tty00 if you connected the printer to port 1 or /dev/tty01 if you connected the printer to port
       2.

       See the System Administration manual for more information on setting up	consoles  (including  remote  consoles)  and  printers.   See  the
       modem(7) reference page for more information on setting up modems.

SEE ALSO

       Commands: lprsetup(8)

       Devices: ace(7), modem(7)

       System Administration delim off

																	  ports(7)