Login or Register to Ask a Question and Join Our Community


UNIX for Dummies Questions & Answers

Freeing up a serial port with a modem connected

 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Freeing up a serial port with a modem connected
# 1  
Old 01-16-2008
Question Freeing up a serial port with a modem connected
I currently access a remote Unix server which has an external modem connected to one of it's serial ports (/dev/cua/b). At times, this server undergoes a hard reset and for some reason this disallows us from making use of the modem any longer. A hard reset of the modem always seems to fix the problem, however I was wondering if there was anything I could do from my x-terminal to "kick or free-up" the port/modem. When I issue the tip /dev/cua/b command when things are working, I am able to query the modem using ATI4 and such. But when either it or the port are in this strange state, I get no echo back of characters that I type while in tip. Can anyone recommand a command that I can issue from the Unix prompt to free up the port to avoid having me to call in a help ticket to simply get the modem reset?
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Solaris

Solaris 11.2 does not assign serial port to 3g usb modem?

In ubuntu etopic i create this udev rules for prolink 3g usb modem: SUBSYSTEM=="block", SUBSYSTEM=="scsi", ATTRS{idVendor}=="1e0e", ATTRS{idProduct}=="f000", ACTION=="add", RUN+="/sbin/modprobe usbserial Vendor=0X1e0e Product=0Xf000" After plugging the usb modem, ubuntu assigns the ports... (4 Replies)
Discussion started by: shamsat
4 Replies

2. 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

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. Solaris

luxadm -e port shows one port not connected

hi i have a sun machine which has one hba 2ports; out of which one port says it is not connected # luxadm -e port /devices/pci@1d,700000/SUNW,qlc@1/fp@0,0:devctl CONNECTED /devices/pci@1d,700000/SUNW,qlc@1,1/fp@0,0:devctl NOT CONNECTED but both... (9 Replies)
Discussion started by: anwesh
9 Replies

5. AIX

serial modem connection

I configured the serial modem in my P6-550 AIX 5.3 box But i dont have telephone line. when I run the command # cu -l /dev/tty1 the output is as follows does it mean that my modem is responding to the command? can i say my serial port is working and communicating fine? Connected ... (3 Replies)
Discussion started by: pchangba
3 Replies

6. Solaris

Communicate Serial Modem using non-Root user

Hi, I'm having a issue on communicating the serial GSM modem in Sun Solaris 5.9 To implement such connectiom, i'm using the "tip -115200 /dev/term/a" command and i successfully get the "connected" status And then i send a "AT" message and receive "OK" response from the modem :D Anyhow,... (0 Replies)
Discussion started by: darontan
0 Replies

7. Linux

modem - usb to serial configuration

I have a serial modem connected to a usb port using an adapter cable. The system is a HP DL360. RedHat ES3.0 I am using the device /dev/ttyUSB0 When I issue the command "mgetty ttyUSB0" I get the following output in the log file. How do I get the system to see the modem. 12/02 14:17:55... (2 Replies)
Discussion started by: jshoovie
2 Replies

8. Linux

get innet access by dualup to linux box connected to dsl through phone line modem

Hi! I'm looking for a sollution on this task: is there any way to make linux as some sort of personal ISP, with would let me/somebody else get internet access by dialing up to linux box through phoneline? to use it as sort of a proxy or something simular? I could manage it on windows 2000... (2 Replies)
Discussion started by: V@no
2 Replies

9. UNIX for Dummies Questions & Answers

Got connected with Modem but cannot dial Telephone no. to connect to host

Hello There, I configure my Modem as follow. Step1. # admintool & Then from Browse --> Serial Port i select tta port and Edit --> Modify From that i select Template : Modem:Dial Out Baud Rate: 9600 Ok Step 2 # tip /dev/cua/a connected (1 Reply)
Discussion started by: abidmalik
1 Replies

10. UNIX for Dummies Questions & Answers

getting info from microannex connected to serial port A

Hi, is there a way to get information of an annex device connected to port A ? i need to get the I.P address of the annex and the port it connected to on the annex. dori (1 Reply)
Discussion started by: dorilevy
1 Replies
Login or Register to Ask a Question

LEARN ABOUT OSF1

scc

scc(7)							 Miscellaneous Information Manual						    scc(7)

NAME

       scc - Serial keyboard/mouse/communications interface

SYNOPSIS

       controller   scc0   at tc0   slot 3   vector sccintr

DESCRIPTION

       Two  base  board  Zilog scc dual UARTS provide DEC 3000 series personal systems with keyboard, mouse, and serial communications interfaces.
       The serial communications interfaces can operate at baud rates from B50 to B57600 (see tty(7)).

       The driver for the scc interface supports hardware flow control using the Request to Send (RTS) and Clear  to  Send  (CTS)  signals.   When
       hardware  flow  control is enabled, the flow of input data is controlled by the RTS signal and the flow of output data is controlled by the
       CTS signal.  If the CTS signal is off, the driver will suspend output to that line until the CTS lead is reasserted.  Likewise, the  driver
       will  turn off the RTS lead to tell the device connected to the line to stop sending data as a result of congestion on the host side.  When
       the condition clears, the driver will turn on the RTS lead to tell the device to resume sending data.

       In alternate console configurations (that is, no graphics head), communications port 2 (/dev/tty01) becomes the system console. The  serial
       system console port always operates at 9600 BPS, 8-bits, no parity.  No modem or hardware flow control is supported.

RESTRICTIONS

       Data  communications  equipment attached to the console serial port in alternate console configurations must be set to 9600 BPS, 8-bits, no
       parity. The scc driver enforces this restriction.

       Only communications port 1 (/dev/tty00) includes full modem control.

FILES

       console terminal local terminal local terminal

RELATED INFORMATION

       console(7), devio(7), modem(7), tty(7), MAKEDEV(8) delim off

																	    scc(7)