10 More Discussions You Might Find Interesting
1. Solaris
I am having troubles with carrier detection for dialing in via a modem or direct connection via a null modem connection under Solaris 8 (i.e. login session remains active after the modem disconnects). I tried two different dumb modems (which do not respond to AT commands) on the machine that I am... (6 Replies)
Discussion started by: rstor
6 Replies
2. Hardware
Hello,
I want to connect a VT520 terminal to p3 linux box.
I have two questions regarding the connection. First,
is it possible to use RJ45 instead of RS232
cable. (with DB9 pin to RJ45 and DB25 to RJ45 converter).
Second point is that; do i need null modem cable or
straight cable... (5 Replies)
Discussion started by: vectrum
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3. Shell Programming and Scripting
I have an input file having 7 fields delimited by ,
eg :
1,ABC,hg,1,2,34,3
2,hj,YU,2,3,4,
3,JU,kl,4,5,7,
4,JK,KJ,3,56,4,5
The seventh field here in some lines is empty, whereas the other lines there is a value.
How do I insert string NULL at this location (7th loc) for these lines where... (8 Replies)
Discussion started by: zilch
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4. Shell Programming and Scripting
Hi all,
My input file having the following details,
sid,worldpar0334,1024,production setup
am storing all values like this
C1=cut -d "," -f1
C2=cut -d "," -f2
C3=cut -d "," -f3
C4=cut -d "," -f4
so now in above case we have all values, but
if my input file is like this... (1 Reply)
Discussion started by: ilugopal
1 Replies
5. Solaris
Hi Gurus,
Can I use null modem cable in Ultra sparc 10 workstation
Thanks (3 Replies)
Discussion started by: kumarmani
3 Replies
6. IP Networking
hello all,
how to test two modems in the same device? i have ppp running in my device.. (1 Reply)
Discussion started by: s123.radha
1 Replies
7. Solaris
Hi all,
Is there any difference between a null modem cable or a modem cable ?
i assume that a null modem cable is a normal cable that i used from cpu serial ports to a modem for dialup.
please correct if i am wrong,
thks (2 Replies)
Discussion started by: waterbear
2 Replies
8. Solaris
HI all,
i still have a problem when using null modem to see the output from my server(sun ultra en 3000).
i followed the instruction from the internet, but it is not working.
1. i am using db9(5 4, 2 rows,put in laptop serial port) and db25(13 12, 2 rows,put in (A) server serial port).
2.... (3 Replies)
Discussion started by: waterbear
3 Replies
9. UNIX for Dummies Questions & Answers
I am new to Unix. I just got my SUN box from ebay with Solaris supposedly preloaded. The problem is I am unable to connect via Hyperterminal to Solaris, or more to the point, cannot tell if I have a successful connection and that solaris is the one not properly booted up.
I hooked up a null... (3 Replies)
Discussion started by: seethams
3 Replies
10. UNIX for Dummies Questions & Answers
Ok. I tried following the directions from some of the other threads, but I've hit a road block.
I have red hat 7.3 and I installed the hcf package:
hcfpcimodem-0.99lnxtbeta03042700k2.4.18_3-1rh.i386.rpm
It installed ok, no errors, but I still can't get linux to find my modem. I've tried... (2 Replies)
Discussion started by: lawadm1
2 Replies
DH(4) Kernel Interfaces Manual DH(4)
NAME
dh - DH-11/DM-11 communications multiplexer
SYNOPSIS
/sys/conf/SYSTEM:
NDH dh_units # DH11; NDH is in units of boards (16 each)
NDM dm_units # DM11; NDM is in units of boards (16 each)
/etc/dtab:
#Name Unit# Addr Vector Br Handler(s) # Comments
dm ? 170500 310 4 dmintr # dm11 dh modem control
dh ? 160020 320 5 dhrint dhxint # dh11 terminal mux
major device number(s):
raw: 3
minor device encoding:
bits 0017 specify line on DH unit
bits 0060 specify DH unit
bit 0100 specify RTS/CTS (``hardware'') flowcontrol
bit 0200 specifies non-blocking open (``CD always on'')
DESCRIPTION
A dh-11 provides 16 communication lines; dm-11's may be optionally paired with dh-11's to provide modem control for the lines. If there
are fewer dm-11's than dh-11's, the dm-11's are assumed to be paired with the first dm_units dh-11's.
Each line attached to the DH-11 communications multiplexer behaves as described in tty(4). Input and output for each line may indepen-
dently be set to run at any of 16 speeds; see tty(4) for the encoding.
Bit 0200 of the minor device number for DH lines may be set to say that a line is not properly connected, and that the line should be
treated as hard-wired with carrier always present. Thus creating the special character device node "3, 130" via mknod /dev/ttyh2 c 3 130
would cause line ttyh2 to be treated in this way. Bit 0100 of the minor device number enables RTS/CTS (also called ``hardware'') flow con-
trol. It is enabled by adding 64 to the minor device number: mknod /dev/ttyh2 c 3 194
The dh driver monitors the rate of input on each board, and switches between the use of character-at-a-time interrupts and input silos.
While the silo is enabled during periods of high-speed input, the driver polls for input 30 times per second.
FILES
/dev/tty[h-k][0-9a-f]
/dev/ttyd[0-9a-f]
/dev/MAKEDEV script to create special files
/dev/MAKEDEV.local script to localize special files
SEE ALSO
tty(4), dtab(5), autoconfig(8)
DIAGNOSTICS
dh%d NXM. No response from UNIBUS on a dma transfer within a timeout period. This has never been observed on a PDP-11 and is a carryover
from the VAX driver when it was ported. It is not serious.
dh%d %d overruns. The character input silo overflowed before it could be serviced. This message is only printed at line close time. It
is not serious but does indicate that the system was not able to keep up with the data flow.
3rd Berkeley Distribution May 31, 1997 DH(4)