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- Category of communication line: Serial, SerialOverUDP Device Redundant, or File I/O.
- Parameters of the Serial line are set according to the setting of GPS equipment.
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The files are searched in the directory according to the setting of the "Input file" parameter on the "File I/O" tab in the configuration of the line. The file must correspond to a mask according to the Filename Mask station protocol parameter. The file is analyzed (read) from top to bottom, after processing it is moved to the archive directory according to the setting of parameter "Archive directory" on tab the "File I/O" tab in the configuration of the line. In this directory, the subdirectories with the time of creation or data analysis are created (see the "Archive subdirectory time mask" parameter).
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Table 1
| Full name | Meaning | Unit / sizeSize | Default value | ||||||
|---|---|---|---|---|---|---|---|---|---|
| A mask which is used to create the archive subdirectories for storing of the processed files (important only for File I/O lines). Use the following text string to set mask:: "yy" or "rr" - year (short format), "yyyy" or "rrrr" - year (long format), "mm" - month, "dd" - day. | - | yyyymm | ||||||
| Full path to a file that contains a definition of polygons (a localization of position in polygon - geofencing). Blank text disables the localization feature. See the chapter Geofencing - localization of position. | - | - | ||||||
| The time period of reading of the source directory. | mi:ss | 01:00 | ||||||
| Backup directory for storing unknown files. | - | - | ||||||
| Delay after processing of a file. | ss.mss | 00.100 | ||||||
| Time filter of data. If the timestamp of received data deviates from the current time by more than defined hours in the future, they are ignored. Set 0 (zero) to ignore the time filter. | hours | 0 | ||||||
| Time filter of data. If the timestamp of received data deviates from the current time by more than defined days in the past, they are ignored. Set 0 (zero) to ignore the time filter. | days | 0 | ||||||
| Additional error log file for tracing communication errors | - | - |
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- Communication protocol "NMEA-0183".
- As for Serial and SerialOverUDP Device Redundant lines (i.e. asynchronous serial communication), the address parameter is not required (blank text). The protocol NMEA-0183 does not support the addressing of devices. Data are sent spontaneously. Only one device may be connected to one serial asynchronous communication line.
- As regards the File I/O line, the address may be any text string. It can be used for searching of the file with NMEA data for the given station (see the Filename Mask station protocol parameter).
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| Full name | Description | Unit / Size | Default value | ||||||
|---|---|---|---|---|---|---|---|---|---|
| A retry count of reading response until its completion. Maximum retries of reading of line so that the NMEA packet/record is complete (it is relevant only for Serial and SerialOverUDP Device Redundant lines). | - | 40 | ||||||
| Delay between the readings of the line until NMEA packet/record is complete (it is relevant only for Serial and SerialOverUDP Device Redundant lines). | ms | 50 ms | ||||||
| Conversion of data of geographical position from NMEA records GPRMC.3, GPRMI.1, GPGGA.2, GPGLL.1, PGRMF.6 for latitude and GPRMC.5, GPRMI.3, GPGGA.4, GPGLL.2, PGRMF.8 for longitude. You can choose "deg/min" (a native format of NMEA, the same value as it has been read) or "deg" (conversion to degrees). | deg/min deg | deg | ||||||
| Conversion of data about the speed to a required technical unit (GPRMC.7 and GPVTG.3 in knots, GPVTG.4 and PGRMF.12 in km/hour). | knots km/hour | knots | ||||||
| Show information about the received raw data. | YES/NO | YES | ||||||
| Show details about analyzed values of I/O tags. | YES/NO | YES | ||||||
| Mask for searching of files with NMEA information (it is important only for File I/O). Mask must be a text string with support of special items in braces {}: {N...N} - address of station, 'N' character count must be equal to the length of station address, {yyyy} or {yy} - year (short/long format), {mm} - month (1 to 12), {dd} - day (1 to 31), {hh} - hour (0 to 23), {mi} - minute (0 to 59), {ss} - second (0 to 59). Digit placeholder '*' may be used also at any position in a mask. Examples: nmea_data.* nmea_data*.txt nmea_data{NNN}.txt nmea_data{yyyy}{mm}{dd}_{hh}.txt station_{NNNNNN}* | - | |||||||
| Positive value activates the correction of system time from GPS data. If the difference between the system time and time received from GPS is greater than the value of this parameter (in milliseconds), a task that adjusts system time will be started. Time will be adjusted in small steps to avoid a sudden time-jump which is usually undesirable. The default value of this parameter is 0 and it means that time synchronization is disabled. | ms | 0 | ||||||
| If the absolute value of a computed time difference between GPS time and system time is greater than the value of the parameter Long Difference Time, then the correction of system time will not be started immediately. Instead, the D2000 KOM process detects whether this difference is repeated at least Long Difference Count times consecutively. If it does and if the absolute value of the difference of consecutive time differences is not greater than Long Difference Time then the correcton correction of system time will be started. Parameters are meant as a protection of random occurrence of "out of range" time. Value 0 of parameter Long Difference Time disables this protection. | sec | 0 | ||||||
| - | 0 | |||||||
| KOM process publishes only the values received on the edge of a new minute (sec = 0). For proper functionality, the polling period must be less than one minute. | YES/NO | NO | ||||||
| Full path to the external command file which is called with the defined period. Empty text string means that the external command file is not used. | - | |||||||
| The period for calling external command file. If the value is 0 seconds, the command file is called always before data reading from the particular station. | min:sec | 60 sec | ||||||
| Call external command file synchronously (YES) or asynchronously (NO). | YES/NO | YES |
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Allowed types of I/O tags: Ai, Ci, Di, TiA, TiR, TxtI.
The address of the I/O tag is in the format:
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SSSSS - the identification of NMEA record (e.g. "GPRMC")
I - an index of the order of data in the NMEA record. The index is a positive integer number. 0 = the index of an identifier of NMEA record, 1 = index of the first value.
You can configure a special I/O tag Ci or Ai with address $POLY, which acquires the value of a polygon code, in which the current position was localized. See the chapter Geofencing - localization of position.
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The implementation of the protocol requires reception of NMEA packet/record "GPRMC" (Recommended Minimum Specific GPS/TRANSIT Data). From time data UTC date/time in this packet, a timestamp is created. This timestamp is changed from UTC to the local time and then is used to assign the timestamp (value time) in all values of I/O tags.
| Kotva | ||||
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If the file with the definition of polygons is read successfully, the localization of position in polygon is activated. The file format is following:
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The error messages, mentioned below, may occur during the start or of communication. It is recommended to activate the monitoring of communication in the configuration of the line for easier identification of problemproblems. You can choose it from these levels:
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- Ver. 1.0 - February 8, 2008 - document creating.
- Ver. 1.1 - March 13, 2008 - modification of protocol parameters.
- Ver. 1.2 - August 21, 2009 - updating of the document.
- ver. 1.3 - February 19, 2015 - added new parameter added to station parameters.
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