Manual K2L (Data Logger for Kinemetrics Altus K2)

Transcription

1 Manual K2L (Data Logger for Kinemetrics Altus K2) 1 November 2013

2 Utrecht University Faculty of Geosciences Department of Earth Sciences, Budapestlaan 4, 3584CD Utrecht. PO Box 80021, 3508 TA Utrecht, The Netherlands. Arie van Wettum, Electronics Engineer. Tel: +31 (0) Fax: +31 (0)

3 Contents Overview The hardware Installation Retrieving data Communication RK2 program PWRMON program DAILY_TASKS script Schematics Specification

4 1. Overview The K2 data Logger (K2L) was designed to have the possibility of storing and transferring continues data coming from a Kinemetrics Altus K2 digital recorder. Data from the Altus K2 is send out serial at a rate of 100 Hz to the K2L system. Incoming data is converted in to miniseed format which is common used in exchange of earthquake data. Status data, also send by the Altus K2, is logged as well and stored in daily status files. Data storage is done on internal USB stick, which act as circular buffer, and at the same time to external USB stick. Alternatively the external USB connection can be used for sending data over a modem connection. A power management system is taking care for starting up and shutting down the K2L computer in case the voltage drops below a preset value. Communication with the K2L is done by network connection using SSH. 2. The Hardware The embedded computer in the K2L is the Raspberry pi model B with 512MB memory. Big advantage is the low power consumption, availability world wide and low price. Unfortunately the Raspberry has no real RS232 interface neither a real time clock that keeps the time when off power. However, there is an GPIO (general purpose input/output) connector that can be used to make those two option. So on the Raspberry board you will find a small board (power monitor) mounted that holds a real RS232 interface, a real time clock with battery backup and a micro controller that takes care for starting up and shutting down the system. The controller is also checking if the system is up and running by sending regularly signals that has to be answered by software running on the Raspberry. In case of no acknowledge the controller will force a reboot in an attempt to get the system running again. 3. Installation The K2L expects data from the Altus K2, sampled at 100 Hz continuously, and either 1, 2, 3 or 4 channels output. The Altus K2 settings for the RS232 output should be set at Baud, 8bit, no parity and 1 stopbit. See the manual for details. Installation of the K2L is just a matter of connecting the RS232 connector to the Altus K2, connecting the external USB stick for storage and connecting the power. The system will start up and automatically start logging data from the Altus K2. The status LED PWR will light red continuously, meaning there is power. In case the system receives data from the Altus, the ACT LED will flash shortly green every 10 or 12 second, meaning that the internal SD card is accessed. Connecting the network cable to a PC well licht the other status LEDs. Do NOT connect the the K2L to the Load of a solar panel controller! Uncontrolled shut off could corrupt the SD card and the system will stop working.

5 4. Retrieving data Retrieving data is only a matter of reading out the external USB stick. However, before removing the stick, first convince your self that the system is not writing to the stick at that very moment. Removing could harm the stick with loss of data as a result. On a station visit always first check the status LEDs and see if the logger is up and running. Connect the network cable between PC and K2L and connect with SSH. Type ssh logger@ and log in with password. Data transfer to the USB sticks is done daily at 1:15 hr. It could be that system time is to far off or you are really there at 1:15 hr in the night! Therefore, check the time, and be sure the sticks are not mounted before you pull them out. Check the time with command date. With the command mount you can verify if the sticks are mounted and so the system is busy with them. The internal USB is always /usb1 and the external /usb2. If not busy, run first the command./daily_tasks. This can take a few minutes and will ensure that the latest data is on stick. Get the stick out and read the data out on your computer. When done, delete all data from the stick and place it back in the K2L. Take care! Use the command line for deleting data on the USB stick. When using the file browser under Linux or Microsoft Windows for this, data will NOT be removed from the stick but placed in a trash directory of file. This means every time less space! Deleting files with Linux, type: rm -rf /device/data_100hz rm -rf /device/log_files removing data. removing the log information. (device could be for example /usb1 or /dev/sda1 etc) 5. Communication Communication with the K2L is established by connecting the Ethernet (cross) cable between K2L and PC. Open terminal window and call: ssh logger@ (same for all K2Ls) Log in as logger Passwd: tril120 (passwd su: lobatse14) With ls you will see the follow: daily_tasks data_100hz log_files pwrmon rk2 rk2.log rk2.settings src Script file. Copys daily data files from computer SD card to USB stick(s). Directory with the 100Hz data files. Directory with the daily log files. Program which talks to the power management hardware. Main data logger program. Log file in with error reports from rk2 program. File with current settings rk2 program. Source directory programs.

6 6. RK2 program The main program rk2 and the pwrmon will start up automatically on boot. To set the different command line options for rk2 you have to edit the /etc/rc.local as su and restart the program. Most easy would be to reboot the system. As su type the command reboot. Use editor nano to adjust so nano /etc/rc.local See the line: su logger -c./rk2 -com 22 -a F -s TOT01 -n BX -l Toteng -ch1 HNZ -ch2 HNN -ch3 HNE -w m and adjust this for a particular station. Typing./rk2 will show you the various options that can be set: RK2.C By : Arie van Wettum, Utrecht University, Seismology Version : Oct 2013 Use : rk2 [-h] [-c nr] [-m nr[-a E or F] [-s station code] [-n network code] [-l location name] [-chx channel id] [-w i or m] [-d] Where : -h This help menu -com Com port. COM1= 0...COM5= 5 or USB0= 16...USB5= 21 default= 22 ttyama0 -m Max number of 4K blockettes/stream. Default a Accelerometer type [E]picensor or [F]BA -s Station code (max 5 char) -n Network code (max 2 char) -l Location name -ch1 Channel identifier channel 1 (max 3 char) -ch2 2 -ch3 3 -ch4 4 -w Word order i= Intel, m= Motorola -d Start logging with default settings -v Verbose option. Provide additional information For example we take station Toteng: su logger -c./rk2 -com 22 -a F -s TOT01 -n BX -l Toteng -ch1 HNZ -ch2 HNN -ch3 HNE -w m & In the file rk2.settings you will see: rk2.settings Software version: Oct 2013 Location: Toteng Accelerometertype: FBA23 Station code: TOT01 Network code: BX CH1_id: HNZ CH2_id: HNN CH3_id: HNE CH4_id: XXX Word order: Motorola Communication port: AMA The file rk2.log will hold error messages and information about time gaps. Delete this file ones in a while by hand. As soon as data is coming in from the Altus K2, the directory data_100hz and log_files appears. The same structure is used on the USB sticks.

7 Data files are named as follows: station_id.year.daynr.hr min sec.dat The time stamp is the time of the first sample of CH1 (vertical component) in this file. For example: TOT dat Log files are made daily and are named as follows: station_id.year.daynr.log, for example: TOT log. Those are text files so readable. From every last Altus K2 status report GPS status is written to file log_files/rk2_last.log together with time last lock and available SD card diskspace. This information could for example be used in future to send with SMS or . For example, the file contains :30:46 gps_stat:1a disk: For explanation GPS status see the Altus K2 manual. 7. PWRMON program The pwrmon program is taking care for shutting down the K2L in a nice way in case of a low power situation. As soon as the hardware (power monitor) detects that the (battery) power is below 10 Volt, it informs the pwrmon program to shutdown the K2L in a nice way. Finally all power to the system will be switched off and only 6 ma is consumed to keep the power monitor board running. As soon as the (battery) power becomes more than 12.2 Volt, the power will be switched on again and the K2L will boot and start logging. On frequent intervals the power monitor board is sending a signal to the pwrmon program to check if the K2L is up and running. In turn it sends back an acknowledge to the monitor board. In case this signal is not coming in, the power monitor board will tell the K2L to shut down in a nice way and after some time it will also switch off the power. After 60 minutes the power will be switched on again. This 60 minutes is taken to provide enough time to do a disk check without shutting down due to no acknowledge from the software. 8. DAILY_TASKS script The Linux cron program will run daily at 1:15 hr the script file daily_tasks. Data and log files are copied from the internal SD to the USB stick(s) and in case the internal USB stick is full, the oldest files are delete. The internal stick in this way behaves like a circular buffer. Run as user logger crontab -l to list the contents. # # Every day at 1:15 copy data and log files from SD card to USB sticks. # Avoid full internal USB stick by removing oldest files * * * /home/logger/daily_tasks &

8 9. Schematics Power Management Board

9 Real Time Clock

10 K2L Connectors

11 Power cable connection: Transparent = power positive, Black = power negative Status LEDs can be observed trough the small glass in the lid of the K2L and have the following meanings: ACT D5 (Green) SD Card Access PWR D6 (Red) 3.3 V Power is present FDX D7 (Green) Full Duplex (LAN) connected LNK D8(Green) Link/Activity (LAN) 100 D9(Yellow) 100Mbit (LAN) connected 10. Specification Power input Power consumption Power consumption power down Start up voltage level Power down voltage level Default IP Internal USB External USB Volt DC < 3.0 Watt < 80 miliwatt 12.2 Volt 10.0 Volt GB (USB3) 32 GB (USB3) Embedded computer Internal SD card Battery Real Time Clock Power management board Real Time Clock board Raspberry pi model B with 512MB 8 GB (for the moment only 4 GB in use) 3 Volt type Designed by Utrecht University