University of Bergen Institute of Solid Earth Physics Allé gt. 41, N-5007 Bergen, NORWAY Tel: (+47) 5558 3420 Fax: (+47) 5558 9669 http://www2.ifjf.uib.no/ Document status: DRAFT Last update Nov. 9, 2001 by OM LinAcq sonobuoy recording system Arctic Ocean 2001 Geophysical Surveys

Contents

1. Overview
2. PC Hardware
3. A/D board: PCI-DAS1602-16 
4. Linux driver for PCI-DAS1602-16 A/D card
5. Trigger input
6. Connector pin-out for PCI-DAS1602-16 A/D card
7. Linux config
   • 7.1 fdisk, print partition table for sda
   • 7.2 /etc/mtab
   • 7.2 /etc/profile
8. Software
   • 8.1 Installing A/D-card driver module
   • 8.2 Running the acquisition program
   • 8.3 Exabyte tape back-up
   • 8.4 CD-WR
   • 8.5 Misc.
   • 8.6 GPS sync program (didn't work ..)
   • 8.7 Linacq source code (both Tck/Tk and C code)
   • 8.8 LinAcq software documentation

1. Overview

The Linacq data recording system consists of the following parts:

 +------------------------------------+
 |            LinAcq PC               |
 +------------------------------------+
 | OS: Linux RedHat 6.1               |
 | CPU, RAM: PII, 466MHz, 128MB       |
 | HD: SCSI, 18.2GB Fujitsu MAE3182LP |
 | CD-WR: Sony CRX-140s (SCSI)        |
 | TAPE: Exabyte                      |
 +------------------------------------+
 | A/D card (PCI):                    |
 |  - 16-bit                          |
 |  - 16 ch. single-ended,            |
 |    or 8 ch. differential.          |           +--------------------+ 
 | Mod: PCI-DAS1602-16                |           |    Input panel     | 
 | Mfr: Measurement Computing         +===========+  Signal & trigger  | 
 |      (formerly ComputerBoards)     |           |       BNC          |
 +------------------------------------+           +--------------------+

                    Fig. 1. Linacq block diagram 

2. PC Hardware

Main PC

Back-up PC

3. A/D board: PCI-DAS1602-16 

• Board #1 purchased April 1998.
  • Product description (pdf, 531 kB)
  • Manual, dated January 1999 (pdf, 175 kB)
  • Manual, dated September 2000 (pdf, 650 kB)

4. Linux driver for PCI-DAS1602-16 A/D card

The Linux device driver for this data acquisition boards is written by Dr. Warren J. Jasper at North Carolina State University. These drivers are freely available via anonymous ftp from: ftp://lx10.tx.ncsu.edu/pub/Linux/drivers. They are also available from this server, click here. As of May 31, 2001 we use version 1.5.

A listing of the terminal window during installation.

5. Trigger input

The switch selects trigger type. 

"Current pulse" input is tailored to GeTech GUNCO "FTB recording" output where there is a resistor that acts as current limiter. IMPORTANT: Ensure current is limited (< 15 mA?) if other trigger source is used with this input.

Fig. 2: Trigger input. Note: Limit current on J2 if triggered from other source then GeTech GUNCO "FTB Recording".

6. Connector pin-out for PCI-DAS1602-16 A/D card

                  Fig. 3. A/D-card connector pin-out.

7. Linux config (main PC)

7.1 fdisk, print partition table for sda

Command (m for help): p

Disk /dev/sda: 255 heads, 63 sectors, 2222 cylinders
Units = cylinders of 16065 * 512 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/sda1   *         1        39    313236   83  Linux
/dev/sda2            40      2222  17534947+   5  Extended
/dev/sda5            40      1694  13293756   83  Linux
/dev/sda6          1695      2077   3076416   83  Linux
/dev/sda7          2078      2205   1028128+  83  Linux
/dev/sda8          2206      2222    136521   82  Linux swap
             

7.2 /etc/mtab

/dev/sda1 / ext2 rw 0 0
none /proc proc rw 0 0
/dev/sda7 /home ext2 rw 0 0
/dev/sda5 /qc3 ext2 rw 0 0
/dev/sda6 /usr ext2 rw 0 0
none /dev/pts devpts rw,gid=5,mode=620 0 0

7.3 /etc/profile

# /etc/profile

# System wide environment and startup programs
# Functions and aliases go in /etc/bashrc

export PATH="$PATH:/usr/X11R6/bin:/usr/matlab/bin:/usr/local/gmt-3.3.6/bin:/usr/local/SU/bin"
export GMTHOME=/usr/local/gmt-3.3.6/data

ulimit -c 1000000
if [ `id -gn` = `id -un` -a `id -u` -gt 14 ]; then
	umask 002
else
	umask 022
fi

USER=`id -un`
LOGNAME=$USER
MAIL="/var/spool/mail/$USER"

HOSTNAME=`/bin/hostname`
HISTSIZE=1000

if [ -z "$INPUTRC" -a ! -f "$HOME/.inputrc" ]; then
	INPUTRC=/etc/inputrc
fi

export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC

for i in /etc/profile.d/*.sh ; do
	if [ -x $i ]; then
		. $i
	fi
done

unset i

        

8. Software

8.1 Installing A/D-card driver module

This must be done before the acquisition program is started. Type (as root):

/sbin/insmod -f /home/oistein/pci-das1602-16/pci-das1602-16.o
# See 'man insmod' for details.

8.2 Running the acquisition program

At present the program is placed in /home/oistein/linacq, thus: 

cd /home/oistein/linacq
# Start the program:
./linacq.tcl

The Tcl/Tk program is a front to the C program that's doing the hard work.

View program directories.

8.3 Exabyte tape back-up

For tape newbies. Example: Tar content of /etc and send it to the Exabyte, rewind the tape and check what's there. See man pages for command details. Important: The Exabyte must be ready to receive command - look for a steady green light.

du -ks /etc			# Size?
tar cvf /dev/nst0 /etc/		# Tar it to tape
mt -f /dev/nst0 rewind
tar tvf /dev/nst0		# Check it
mt -f /dev/nst0 rewoffl		# Tape out

8.4 CD-WR

Note from Halvard:

CD-Brenning:

www.http://www.uio.no/~hpv/cdsvi.html

qc3/halvard+++ må selsagt byttes ut med navnet/ene på den katalogen din fil ligger i og
hvor image filen din skal ligge.

# Filer:
mkisofs -a -J -l -r -v -o /qc3/halvard/image/image.iso /qc3/halvard/brennes  # Lager image
cdrecord -v -dummy speed=8 dev=0,2,0 /qc3/halvard/image/image.iso # Testbrenning
cdrecord -v speed=8 dev=0,2,0 /qc3/halvard/image/image.iso # Brenning

# Ø.Aa. metode:
cdrecord --scanbus
cdrecord dev=0,2,0 speed=8 -v seawolf-i386-disc1.iso # Eksempel fil

# Lyd:
cdrecord -v -pad -audio -dummy speed=8 dev=0,2,0 fil1.wav fil2.wav fil3.wav ...  (eller *.wav)
cdrecord -v -pad -audio speed=8 dev=0,2,0 *.wav

http://www.matarese.com/CD-Writing-HOWTO.html :

4.7.  Is it possible to make a 1:1 copy of a data CD?"

  Yes. But you should be aware of the fact that any errors while reading
  the original (due to dust or scratches) will result in a defective
  copy.

  First case: you have a CD-writer and a seperate CD-ROM drive. By
  issuing the command

       cdwrite -v -D /dev/sgc --pad -b  $(isosize  /dev/scd0) /dev/scd0
       or
       cdrecord -v dev=3,0 speed=2 -isosize /dev/scd0

  you read the data stream from the CD-ROM drive attached as /dev/scd0
  and write it directly through /dev/sgc to the CD-R.

  Second case: you don't have a seperate CD-ROM drive. You have to use
  the writer to read out the CD-ROM in this case:

       dd if=/dev/scd0 of=cdimage bs=1c count=`isosize  /dev/scd0`

  This command is equivalent to the result of mkisofs, so you should
  procede as described in chapter 3. Please note that this method will
  fails on audio CDs!

8.5 Misc.

Start SSH deamon:

/usr/local/sbin/sshd2

/sbin/shutdown -h now

8.6 GPS sync program (didn't work ..)

A Python program to trigger the system at regular intervals, based on GPS input on ttyS0. The program should also issue an RS-232 Eiva-like datastream that could be used as input to the LinAcq program - position and time could then be inserted into seg-y headers. The program failed because:

• Could not write trigger signal to parallel port /dev/lp0. os.write command hangs ..
• Could not send trigger signal on TXD output of the same serial port that GPS signal uses. Could send trigger to the other available serial port, though.

#!/usr/bin/python
import string
import os

# Constants:
FireInterval = 10

# Init stuff goes here

print 'Type Ctrl-C to stop!'
gpsdata = open('/dev/ttyS0', 'r')
#trigger = open('/dev/lp0', 'a') 		# No success here ..

trigg = os.open('/dev/lp0', os.O_WRONLY)	# This is test stuff
# Bitwise OR with OS_NONBLOCK doesn't help
antall = os.write(trigg, '1')
print "Antall bytes: ", antall
os.close(trigg)

# This is the field separation and time interval stuff. It's raw but works fine.
# Assumes GPGGA sentence

while 1:
	gpsline = gpsdata.readline()	# Read line from serial port
	if len(gpsline) > 1:		# Line is terminated by CR and LF, gives empty line
		print gpsline[:-1]	# Prepare to output to stdout
		s = gpsline[11:13]	# Extract seconds (fragile, should be improved)
		seconds = int(s)
		if seconds % FireInterval == 0:
			# parport.write('1')
			# parport.write('0')
			#trigger.write('\x00')
			#trigger.write('\xFF')
			print ">>>> FIRE GUNCO, TRIGGER ACQ SYSTEMS >>>>", "\a"
			gps_felt = string.split(gpsline,",")
			# In this version just send it to stdout
			print ">>>> TO FILE    >>>>", \
				gps_felt[1], \
				gps_felt[2], \
				gps_felt[3], \
		        	gps_felt[4], \
				gps_felt[5]

# parport.close()
gpsdata(close)
# trigger(close)2

8.7 LinAcq source code (both Tcl/Tk and C code)

Important note: In the current version the no of channels on the A/D-board is set in the program. If the Linacq system is to act as a backup for a seismic reflection system it provides up to 16 single-ended channels. In that case the BURST_MODE flag must be set to 0 (burst mode ON means that all channels are sampled at maximum sampling rate, then there is a pause until next sampling instant, then a new burst. This reduces sampling skew effects).

Source code directory (copy from backup pc as of Nov 8, 2001).

Previous version: linacq-0.12b.tar.gz

8.8 LinAcq software documentation

 Credits: Øistein Aanensen

Fig. 4 LinAcq block diagram, also showing connection to Navigation system and online QC-system (QCIX)

Not translated yet ...

Kobling mot Eiva med RS232

Time Date Easting Northing Event Depth
15:11:43 22.02.2000 303537.92 6775936.57 15 1207.3
15:11:57 22.02.2000 303337.92 6775836.57 16 1207.3

Kobling mot QCIX qc system

Kildekode og driver.

  gcc -lpthread -O2 -o linacq linacq.c