SSR-LC User`s Manual
Contents
1. Min Typical Max Unit Supply Voltage 4 5 15 VDC Supply Current 5 VDC Supply Idle 37 mA Recording 70 mA 12 VDC Supply Idle 37 mA Recording 70 mA BAT Supply Voltage 1 65 3 6 VDC Digital Input Characteristics RX SSR LC T PDI SH Res Low level input voltage 1 37 V High level input voltage 1 85 V Schmitt trigger hysteresis 100 mV Weak pull up equivalent resistor 25 40 55 Digital Output Characteristics TX SSR LC T ST Low level output voltage 8 0 4 V High level output voltage 8mA 2 9 V Low level output voltage 20mA 1 3 V High level output voltage 20 2 0 V RS 232 Transmitter Characteristics TX SSR LC R Transmitter Output Voltage Range 15 15 V Transmitter Output Voltage into Load 5 29 7 RS 232 Receiver Characteristics RX SSR LC R Receiver Input Voltage Range 25 25 V Positive going input threshold voltage 1 6 2 4 V Negative going input threshold voltage 0 6 1 3 V SanDisk 4GB Class 4 microSDHC card inserted but no data being received SanDisk 4GB Class 4 microSDHC card inserted recording full stream at 115200 baud SLERJ 6 2 Mechanical Dimensions 1 40 x 1 09 x 0 20 inches 36 x 28 x 5 mm 5mm height is without header installed Hole Pattern 0 750 x 0 850 inches 19 05 x 21 59 mm SSR LC User s Manual Rev C 12 May 2015 Hole Diameter 0 096 inches 2 44 mm Designed for No 2 h2. 17 CUnnelapged ATCBIVOS 2iqeado dice tene eres ia beate E na orav esu iibi dun 18 Data 18 5 2 Time Correlation 19 53 UMY dS DIETO S E det aM DUM I RU M Audet 19 6 Specifications RTT AR 21 Gell E E EA 21 62 JMechani al EATE 22 T Revision TAURI TERT 23 SLERJ 2015 Slerj LLC All rights reserved Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner The information presented in this document does not form part of any quotation or contract is believed to be accurate and reliable and may be changed without notice No liability will be accepted by the publisher for any consequence of its use Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights Slerj assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse neglect improper installation repair improper handling or unusual physical or electrical stress including but not limited to exposure to parameters beyond the specified maximum ratings or operation outside the specified range All brands and product names in this publication are registered trademarks or trademarks of their respective holders Slerj is a trademar
3. MicroSD Card Slot push push type connector 8 Figure 2 Bottom View SSR LC TS shown CAUTION Like most electronic components the SSR LC can be damaged by electrostatic discharge Observe typical precautions for handling electrostatic discharge sensitive devices SLERJ 2 3 Connecting the SSR LC The pins of the main connector are described in Table 1 The SSR LC is highly configurable and settings can be changed through a shell interface see Section 4 Interactive Shell and are stored in non volatile memory Typical connections are shown in Figure 3 and Figure 4 In the default configuration as shipped the SSR LC records when the PWM digital input command pin PDI pin 13 is connected to ground and shell is not active pin 7 is allowed to float high To access the SSR LC interactive shell tie pin 7 to ground Default serial parameters are 115200 baud 8 data bits no parity and 1 stop bit While the shell is active pin 7 is low no data is recorded WARNING SSR LC R device pins 9 and 10 are RS 232 voltage level compatible SSR LC T device pins 9 and 10 are 5 Volt tolerant TTL compatible 3 3V CMOS A Do not connect an RS 232 device to pins 9 and 10 of an SSR LC T Note that the RS 232 compatible SSR LC R can be identified by the presence of an IC installed on the bottom of the board at U4 NOTE A proper serial connection to the SSR LC requires transmit receive and ground connections The ground c
4. 5 Volt tolerant and internally pulled to 3 3V See Section 6 1 Electrical for specifications Soft Command Soft Command is a Boolean software parameter that determines whether the device records when the Command Source parameter is soft The soft command can be set through the user interface module shell File Type The SSR LC supports both raw and time tagged archives When file type is raw bytes are written to file just as they are received When file type is tt bytes are encapsulated into a file structure that associates a timestamp with received bytes Bytes are stamped with a resolution of 2ms For details see Section 5 Time Tagged Archives File Mode Supported file creation modes are retry overwrite and append When file mode is retry the SSR LC will continue to retry the file creation operation until it succeeds File creation can fail if a file with the same name already exists This mode is a useful complement to user definable file paths next bullet Overwrite will cause an existing file to be replaced by a newly commanded recording Append will cause new data to be appended to an existing file For both overwrite and append modes if the file specified by File Path does not exist it is created File Path The File Path parameter holds a path template that specifies the name and location of the file to be created when recording is commanded A path template is a normal path string that has replaceable fields defined in Ta
5. Flash Pattern Description READY Indicates that a record channel is ready to Red Short flash every 4 seconds record when commanded CARD ERROR u Indicates that the card is missing or an Red Long flash followed by two unrecoverable error has occurred short flashes every 2 seconds CARD FULL Indicates that the card is full Red Two long flashes every 2 seconds SHELL ACTIVE Indicates that the serial port is connected to Green Solid ON every other the user interface module instead of the data second with flashes to indicate recording subsystem No data is recorded serial activity otherwise SLERJ 4 Interactive Shell The interactive shell is designed to provide easy access to the SD card file system device status and configuration options Entering or help at the command prompt provides information about using the shell Each command can be followed by to retrieve help information Multiple commands can be separated by a semi colon All commands are case sensitive For example cls Usage cls Clears the screen Aliases clear date time 20130327 102840 gt The shell supports line editing and keeps a history of recently used commands The ANSI escape sequences shown in Table 4 are supported Table 4 Shell Line Editing Sequences Keyboard Key Alternate Function Sequence Up arrow p Recall the previous command to
6. SSR LC provides most of the advanced features of the 3 channel Slerj SSR 1 including time tagged archives which are designed to allow analysis and reconstruction of recorded serial streams It is available in both 5V TTL compatible and RS 232 versions Streams can be recorded automatically at power up on command through a digital or PWM input or using an interactive shell interface 1 2 Features Up to 115200 baud recording RS 232 or 5V TTL compatible order option Powered from supply of 4 5 to 15 VDC or directly from 3 3 VDC Small size 1 40 x 1 10 x 0 20 inches 36 x 28 x 5 mm non header version Supports MicroSD and MicroSDHC cards FATI2 FAT16 and FAT32 file system support Long File Name support Support for raw and time tagged archives Battery backed real time clock with externally supplied battery voltage Flexible record control digital input PWM input software controlled or automatic Interactive shell for configuration and file system operations Flexible recording modes overwrite append user defined path and file names etc 2 Getting Started 2 1 Device Versions The SSR LC is available in the following configurations SSR LC TS 5 no header solder pads H 14 pin header dual row 0 100 inch 2 54 mm pitch T 5V TTL compatible R RS 232 SLERJ 2 2 The SSR LC Hardware Channel Status LED Insert card as shown in slot beneath board Figure 1 Top View SSR LC TS shown
7. record Note that the device will not record while SH is pulled low for shell access Figure 3 Typical connections using a 4 5 to 15 VDC supply gt NM NM O Close to Access Shell The jumper between Vs pin 1 and 3V3 pin 5 is required when powering the device from 3 3V DC Figure 4 Typical connections using a 3 3VDC supply 2015 Slerj LLC 7 www slerj com SLERJ SSR LC User s Manual Rev C 12 May 2015 Configured with command source as dig Records when PDI is high o LI 1 Close to STOP Recording Close to Access Shell Dashed connections not required for operation 4 5 to 15VDC Figure 5 Connections when configured with command source as dig The device can be configured to record automatically at power up by configuring command source as dig and connecting as shown in Figure 5 In this case only the connections to the power supply and the device to be recorded are required Both PDI and SH have internal pull up resistors approximately 40kQ and will float high With SH high shell access not requested and PDI high with command source set to dig the device will begin recording at power up Note that the SSR LC serial parameters baud parity stop bits must match the device to be recorded Note that the internal 40kQ pull up resistors of the SSR LC input pins may not be sufficient to keep the pins high in electrically noisy environments In
8. the command line Down arrow n Recall the next command to the command line This is only available when up arrow has been used to recall a previous command Home a Move the cursor to the start of the command line End AZ Move the cursor to the end of the command line Left arrow Ak Move the cursor left one character Right arrow Move the cursor right one character Ctrl Left arrow b Move the cursor left backward one word Ctrl Right arrow f Move the cursor right forward one word The caret indicates use of the Ctrl key with the letter In the description of individual commands below the following conventions are used indicates optional parameters identifies a set of choices separated by choose one indicates a variable defined in the help text SLERJ 4 1 System Commands System commands provide access to general system functions including the real time clock and operational status Table 5 System Commands Command Aliases Description cls clear Clears the screen date Sets the current date to the year month and day specified If no date is specified this command returns the current date help Provides help for using the shell reset Performs a device reset status stat Displays device status date time inputs record channels time Sets the current time using the hour minute and second specified hhmmss ap The h
9. LERJ 5 2 Time Correlation Packet The time correlation packet associates the free running clock timer with the real time clock A time correlation packet is written when the recording is started every 10 minutes and as the recording is stopped Table 10 Time Tagged Time Correlation Packet Element Bytes Description Packet Header 0x82 2 Packet start sequence Run Time 4 Current run time in milliseconds Real Time Clock word 0 bits 15 4 year 2001 2099 bits 3 0 month 1 12 word 1 RTC Time 6 bits 15 11 day 1 31 bits 10 6 hour 0 23 bits 5 0 minute 0 59 word 2 bits 15 10 second 0 59 bits 9 0 milliseconds 0 999 Checksum 2 Fletcher checksum calculated between Run Time and RTC Time inclusive 5 3 The STTP Utility The SLERJ Time Tagged Parser is an open source MIT License Windows command line utility sttp exe that parses time tagged archives into various output types Given a time tagged archive the utility can produce the original raw stream with no timing information a time tagged correlation packet file a data packet file that has a line for each recorded frame and a mixed file that interlaces time correlation packets with data packets Additionally version 1 1 of the STTP utility available at the Slerj website is able to directly generate time stamped line output from archives that contain recordings of line oriented serial data See Applic
10. SLERJ SSR LC User s Manual Revision C 12 May 2015 SLERJ CONTENTS C 4 cg 4 IP MEN 4 4 2 Derice VersIOnS 4 2 2 The SSR LC Hardwate 5 23 Eounec ng the oui shaves EEA EREEREER 6 21 s o U 9 Functional OVerview 10 3 1 Seral Channel si iere te etre eto ke 10 ad Data Ed p 10 3 3 User Interface 13 34 Reale ime Clock 13 35 amp 13 A Interactive Shell uude et err e eter ta t RD IG 14 Zl System VATIONS DU Utque atu vex Nn DM dis dev tinens 15 42 File Commands eerte ete etit erento tia eres aeuo a eaae ese urea dea e a ene 15 S SCENE en EET TE UT 16 44 Capturing the EN IM E MM
11. ardware 6 86mm 0 270 22 10mm 0 870 2 54mm 19 05mm 0 100 10 790 1 00 i 0 039 Por GND 3 21 59mm ae 3 0 850 254mm BE 0 100 t 3 30mm 0 130 MEM TD 35 56 1 500 2015 Slerj LLC D2 44mm 0 096 1 2 14mm 0 084 27 69mm 1 090 12 62mm 0 497 REPA eject stroke 0 130 0 90mm overstroke 0 035 www slerj com SLERJ 7 Revision History Date Rev Changes 29 April 2014 draft release 25 Sept 2014 A Removed field c from Table 2 because the SSR LC has only a single channel so that providing a channel number for file names is meaningless Also the File Path section of 3 2 Data Recording Subsystem was updated to use an example without the c field 17 April 2015 B Table 2 changed pin 2 ID from Vret to GND to match the board silk screen Added dimensioned figure of the board Updated dimensions corrected erroneous hole pattern metric values Added typical connection figures in 2 3 Connecting the SSR LC Added example of shell interaction in 2 4 Using the SSR LC Clarified the Soft Command parameter in section 3 2 Data Recording Subsystem Added reference to the new STTP utility and application note in section 5 3 The STTP Utility 12 May 2015 Additional clarification of the Soft Command parameter in section 3 2 Data Reco
12. ation Note ANO002 STTP Timestamped Lines for details All of the original non raw STTP outputs are space delimited text files Data bytes are represented as a series of hexadecimal text characters An example of each of the textual output files is below Usage of the sttp utility is summarized by its help output usage sttp exe options infile options h Include headers in tcp and dat files r raw file Write raw stream data to raw file t tcp file Write Time Correlation Packets to tcp file d dat file Write Tagged data to dat file m mxd file Write both TCPs and tagged data to mxd file SLERJ Time Correlation Packet output example RunTime ms Year Month Day Hour Minute Second 4196 2013 3 25 9 52 4 625 604196 2013 3 25 10 2 3 628 1204196 2013 3 25 10 12 2 486 Tagged Data output example RunTime ms count HexBytes 4196 20 322E323530333630652B303520322E3339343433 4198 23 30652D3034202D312EbE343530303639652D303420322Eb37 4200 23 3637343235652D303420312E373134373036652D303120 Mixed output example 4196 2013 3 25 9 52 4 625 4196 20 322E323530333630652B303520322E 3339343433 4198 23 30652D3034202D312E343530303639652D303420322E37 604194 23 3032202D352E353633313634652D303120312E 32323636 604196 2013 3 25 10 2 3 628 604196 23 3330652D303220332E313334343333652B303020302037 SLERJ 6 Specifications 6 1 Electrical
13. ble 2 below A field is identified in the template by a backslash followed by one of the field identifiers or several consecutive identifiers encapsulated in square brackets For example the path template st hms dat would be translated to the path st083000 dat if the time is 08 30 00 when a file is created Similarly the path template gps nmeaM txt would be replaced by gps nmeaXXXX txt where XXXX is a number that is incremented on each attempt to open the file Currently path templates of up to 29 bytes are supported and the resulting path with fields replaced must be no more than 64 bytes SLERJ Table 2 Path Template Field Codes Field Replaced With Identifier year 00 99 month 01 12 day 01 31 hour 00 23 minute 00 59 second 00 59 tenth of second 0 9 year 4 digit 2001 2099 hex digit month 1 C day of year 001 366 two digit sequence number 00 99 three digit sequence number 000 999 lelas four digit sequence number 0000 9999 This field identifier is lower case File Size The SSR LC supports automatic file close and reopen when a size or time threshold is reached Threshold values of 1 MB 2 MB 4 MB 8 MB 16 MB 32 MB 64 MB 128 MB 256 MB 512 MB and 1024 MB are supported Additionally the File Size parameter can be set to Hour Day or Week causing new files to be started ba
14. ed through the user interface module shell Command Source can be set to one of the following o soft The device records when the Soft Command parameter defined in the next major bullet is true With soft the default for Soft Command at startup is false The PDI pin is ignored o soft The device records when the Soft Command parameter is true With soft the default for Soft Command at startup is true This selection for Command Source causes the device to automatically record at startup regardless of the state of the PDI pin o dig The device records when the PWM digital input PDI is low dig The device records when the PWM digital input pin PDI is high o pwm Recording starts when the pulse width on the PWM digital input pin PDI is Ims 250us Recording stops when the pulse width on PDI is 2ms 250us o pwm Recording starts when the pulse width on the PWM digital input pin PDI is 2ms 250ys Recording stops when the pulse width on PDI is Ims 250us SLERJ The PWM input is designed to work with the type of signal used by hobby servos The signal is considered valid when high going pulses are present with a pulse width between 750ys and 2250us and a period of 4ms to 65ms The current record state for a channel using the PWM input is changed only when a valid PWM signal is present that meets the requirements of the selected PWM Command Source pwm or pwm specified above The PDI pin is
15. es prior to loading stored configuration data so the serial port always operates at 115200 baud 8 bits no parity and 1 stop bit for capture The process for capture is as follows e On startup the SSR LC displays the boot loader message and device information e The user optionally sends up to 5 lower case z characters followed by the string config All bytes in this sequence are echoed to the user If any byte is received that is not part of this sequence or more than 800ms passes between bytes the capture process is terminated and the SSR LC starts normally e When the previous step has been completed the SSR LC will send a random challenge string consisting of 4 upper case characters The user must type those same characters in lower case to complete the capture process If the challenge string is not answered in 5 seconds the capture process is aborted and the SSR LC starts normally SLERJ 5 Time Tagged Archives Often it is important to know not only what serial data was transferred but when it was transferred This is useful in both the analysis of communication systems and in the ability to reconstruct streams as they originally occurred The SSR LC supports time tagged archives in which received bytes are tagged with the time they were received When the device is configured to record time tagged archives the received bytes are encapsulated in packets prior to being written to the file system Two types of packets are currentl
16. ig pwm src Sets the command source soft lt bool gt Sets the soft command parameter file type raw tt Selects between raw and time tagged archives for the channel file mode retry append overwrite Sets the channel file mode file path lt path gt Sets the channel file path template to path See Section 3 2 Data Recording Subsystem for more information on path templates file size off 11121418116132164 128 256 512 1024 hour day week Sets the file size threshold See Section Section 3 2 Data Recording Subsystem for more information on file size thresholds bool denotes a Boolean expression and may be specified using y true yes for affirmative and false no off for negative The prefix is optional If not specified is assumed SLERJ Note that multiple channel configuration commands may be specified together For example to set the baud parity and stop parameters with a single command type config baud 38400 parity N stop 1 4 4 Capturing the Shell To allow access to configuration without knowing the current serial channel settings the shell can be captured by the user during startup The feature is inherited from the SSR 1 and is a compromise between conflicting requirements Normal startups should be fast and the shell should prevent accidental capture The capture mechanism operat
17. k of Slerj LLC Warranty The SSR LC Serial Data Recorder is warranted against defects in materials and manufacturing for a period of 90 days from the date of purchase In the event of a product failure due to materials or workmanship Slerj will at its discretion repair or replace the product For warranty service return the defective produce to Slerj shipping prepaid for prompt repair or replacement Slerj its suppliers and its licensors shall in no event be liable for any damages arising from the use of or inability to use this product This includes business interruption loss of business information or other loss which may arise from the use of this product SLERJ PRODUCTS ARE NOT DESIGNED INTENDED AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE SUPPORT APPLICATIONS DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS INCLUSION OF SLERJ PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER S OWN RISK Should a customer purchase or use Slerj products for any such unauthorized application the customer shall indemnify and hold Slerj and its officers employees subsidiaries affiliates and distributors harmless against all claims costs damages and attorney fees which could arise SLERJ 1 Introduction 1 1 Description The SSR LC is a low cost addition to the Slerj serial data logger product line It records an asynchronous serial channel at up to 115200 baud onto removable MicroSD media The
18. onnection is critical if the SSR LC is powered from a different supply than the device with which it is communicating Table 1 Main Connector Pins Pin ID Description 1 Vs Supply voltage 4 5 15 VDC or 3 3 VDC 2 GND Supply return tied to GND onboard the SSR LC 3 4 GND Ground connection 5 3V3 Tied to the 3 3 VDC on board supply 6 BAT Battery voltage supply for the real time clock T gt SH Shell Select interactive shell accessible when low 83 res Reserved 94 RX Asynchronous serial receiver input 105 TX Asynchronous serial transmitter output 11 12 GND Ground connection 13 PDI PWM Digital input record command 14 6 ST Record status High level indicates the device is recording 1 See Section 6 1 Electrical for detailed electrical specifications 2 3 3 VDC supply can be used by connecting both the Vs and 3V3 pins to 3 3 VDC If 3V3 is held at 3 3 VDC Vs must not be held at ground 3 5V tolerant TTL compatible 3 3V CMOS input Internally pulled up to 3 3 VDC 4 RS 232 compatible on SSR LC R 5V tolerant TTL compatible 3 3V CMOS input on SSR LC T 5 RS 232 compatible on SSR LC R 3 3V CMOS output on SSR LC T 5 3 3V CMOS output ser s Manual SLERJ Rev C 12 May 2015 Close to Record IT M Tx Close to Access Shell 4 510 15VDC Default command source is dig Pull PDI down to
19. our is assumed to be in 24 hour format However the time may be appended with an a or p to explicitly identify AM or PM if a 12 hour format is used 4 2 File Commands File commands provide access to the SD card file system FAT12 FAT16 and FAT32 volumes are supported and long filenames are supported on FAT32 Many file system commands require a path Both relative and absolute paths are supported in the shell Directories are separated by a forward slash Table 6 File Commands Command Aliases Description chdir path cd Changes the current working directory del path rm Removes a file or an empty directory df Prints the volume size and free space dir path Is Lists the contents of a directory If no path is provided this command lists the contents of the current directory mkdir path md Creates a directory pwd Prints the current working directory ren lt pathI gt lt path2 gt mv rn Moves or renames a file or directory from path to path2 NOTE Do not move open files touch path Updates the timestamp on a file or directory SLERJ 4 3 Device Configuration Device configuration is manipulated through the user interface module The current working configuration is held in system memory RAM and can be saved to non volatile memory for preservation across resets On startup if the contents of the non volatile configuration memory are valid the s
20. rding Subsystem Typological corrections and terminology sync with SSR 1 User Manual
21. rm that the configuration has been saved reboot the SSR LC and verify configuration using reset enter config enter Note that cfg is an alias for config and can be used as a shortcut SLERJ 3 Functional Overview The SSR LC consists of an asynchronous serial channel a data recording subsystem a user interface shell module a real time clock and digital input output for status and control Specific behavior for each functional element is defined by parameters that can be inspected and modified using the user shell interface The parameters for each functional element are described below 3 1 Serial Channel The behavior of the serial channel is defined by the following parameters e Baud rate 600 to 115200 baud inclusive e Parity Even odd or none e Stop l 1 5 or 2 stop bits e Echo Boolean Echoes received characters out through the transmitter Note that the single serial channel of the SSR LC can be attached to either the data recording subsystem or the user interface module based on the level of the SH input pin 3 2 Data Recording Subsystem In addition to the basic serial channel parameters above when a channel is attached to the data recording subsystem SH is high several other configurable parameters apply e Command Source The Command Source parameter determines how the device is commanded to record Options include a discrete digital signal a PWM signal or software controll
22. sed on time instead of size By default the File Size threshold is off and no automatic close reopen operations are performed SLERJ 3 3 User Interface Module The user interface module provides user access to file system operations device status and configuration More information on the interactive shell can be found in Section 4 3 4 Real Time Clock The Real Time Clock RTC maintains calendar time for the SSR LC An off board backup battery typically Lithium 3V connector to BAT and GND on the main connector allows the RTC to keep time across power cycles The RTC time is used to provide time stamps for the creation of files and is associated with the free running system clock in time tagged archives 3 5 Digital 1 0 Digital input and output lines are provided for hardware access to recording control and status On the main connector PDI provides record control as discussed in Section 3 2 Data Recording Subsystem Additionally a status line is provided ST to indicate when the channel is recording Finally a bi color red and green status LED is provided on the SSR LC Figure 1 The red segment illuminates when the corresponding channel is recording The green segment flashes to indicate reception of serial data on the channel and is also used to indicate when the shell is active The following flash codes are implemented using the LEDs to indicate device status Table 3 LED Flash Patterns Status
23. those cases it is recommended to use stronger pull ups e g 4 7 sourced from the on board 3 3V supply 3V3 pin 5 2015 Slerj LLC 8 www slerj com SLERJ 2 4 Using the SSR LC The SSR LC is shipped in default configuration with serial parameters set to 115200 baud 8 data bits no parity and 1 stop bit The device is configured to record when PDI is pulled low and SH is high The interactive shell is accessible through the serial interface when SH is low On power up the SSR LC displays a boot loader announcement and device details If SH is low the shell prompt will be presented A typical power on sequence would produce output similar to Slerj Boot Loader v1 0 0 MK Slerj HW SSRLC MG 1662473 MD SSR LC SN 1 SSR LC Shell Firmware 1 0 0 gt As an example of shell usage consider changing the command source to dig so that the device records when the PDI pin is high In the following sequence lt enter gt means pressing the Enter Return key to execute the command in the shell With the SSR LC connected to a terminal program and the shell active type config lt enter gt to show the current SSR LC configuration To change the command source to dig type config src dig enter Verify that the configuration has been changed using config enter To save the modified configuration in on board non volatile memory so that it is preserved across power cycles type config save enter To confi
24. tored configuration is loaded and used by the SSR LC The shell provides access to device configuration through the following commands Table 7 Configuration Commands Command Description config Prints the current configuration including all channels config save Saves the working configuration to non volatile memory config load Retrieves the stored configuration from non volatile memory config erase Erases the non volatile configuration memory but does not change the current working configuration When non volatile configuration memory has been erased configuration defaults are loaded at startup config args Provides access to serial channel and record parameter configuration If no arguments are specified this command prints the current configuration Specific configuration commands are in Table 8 In addition to the global configuration commands presented in Table 7 there are several serial channel and record parameter configuration commands The commands in the following table are entered as part of a command line config commana Table 8 Channel Configuration Commands Command Alias Description baud lt rate gt Sets baud to rate 600 to 115200 parity ElOINIeloln Sets parity to even odd or none stop 111 512 Sets the number of stop bits echo lt bool gt Enables echoing of received characters on the channel source 1 soft d
25. y defined the data packet and a time correlation packet All multi byte words in the archive are big endian Note that a software utility including source code is provided at slerj com for parsing time tagged archives into a variety of useful formats See section 5 3 The STTP Utility for details 5 1 Data Packet The data packet uses the system free running clock as the time stamp source Bytes are grouped into 2ms windows for stamping Each data packet begins with a base time stamp that identifies the whole second in which the data was collected The base time stamp is followed by a series of frames that are composed of an incremental time stamp fractional second within the base time stamp window and a group of bytes that were received during the increment The data packet is terminated by a checksum Table 9 Time Tagged Data Packet Element Bytes Description Packet Header 0x82 OxA2 2 Packet start sequence Run Time 4 Current run time in seconds Frame repeated until an mSec_Count value of OxFF FF is encountered Fractional second and number of bytes for this frame mSec_Count 2 bits 15 7 milliseconds 2 bits 6 0 number of bytes to follow n The n bytes that were received in the time window leading up to this Data n packet frame End Sequence 2 OxFFFF invalid 5 Count Fletcher checksum calculated between Run Time and End Sequence Checksum 2 inclusive S
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