Telit Wireless Solutions SL869-T Скачать руководство пользователя страница 12

 
 

 

 

 

 

 

 

 

This command is used to enable Position Hold and set the reference (held) position for 
timing.  The entered reference position will be used until it is changed by a subsequent 
command, or until the module is given a system reset.  It can also be used to disable Position 
Hold, but note that the position fields must be populated even when Position Hold is being 
disabled. 

Note that if the auto-survey algorithm is in the process of estimating a reference position, the 
user entered reference position will be overridden by the estimate when the algorithm 
completes its calculation.  Refer to section 3.2.7 for more information regarding the auto-
survey algorithm. 

Synopsis

$PSTMENABLEPOSITIONHOLD <OnOff>,<Lat>,<N/S>,<Long>,<E/W>,<Alt> 
<cr><lf> 

Parameter  Format 

Description 

OnOff 

One digit decimal 

0 – Position Hold will be disabled 
1 – Position Hold will be enabled 

Lat 

DDMM.MMMM 

Latitude (DegreesMinutes.FractionalMinute) 

N/S 

‘N’ or ‘S’ 

Latitude direction (North or South) 

Long 

DDDMM.MMMM 

Longitude (DegreesMinutes.FractionalMinute) 

E/W 

‘E’ or ‘W’ 

Longitude direction (East or West) 

Alt 

dddddd.dd    - Signed 
decimal, up to 8 digits 

Mean Sea Level (MSL) altitude in meters, range -1500 
to 100000 

If the OnOff field is set to ‘1’ and the command is successful, the SL869-T uses the position 
provided in the command as the reference position and responds with the following message: 

$PSTMPOSITIONHOLDENABLED*49<cr><lf> 

If the OnOff field is set to ‘0’ and the command is successful, the SL869-T responds with the 
following message: 

$PSTMPOSITIONHOLDDISABLED*1C<cr><lf> 

However, if an input parameter is missing or is not a valid value, the SL869-T responds with 
the following message: 

$PSTMENABLEPOSITIONHOLDERROR*55<cr><lf> 

The Position Hold feature remains in the previous state when an error occurs. 

Содержание SL869-T

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Страница 3: ...ng the exclusive right to copy reproduce in any form distribute and make derivative works of the copyrighted material Accordingly any copyrighted material of Telit and its licensors contained herein o...

Страница 4: ...ny means without prior written permission of Telit High Risk Materials Components units or third party products used in the product described herein are NOT fault tolerant and are NOT designed manufac...

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Страница 7: ...ss For general contact technical support to report documentation errors and to order manuals contact Telit Technical Support Center TTSC at TS EMEA telit com TS NORTHAMERICA telit com TS LATINAMERICA...

Страница 8: ...o timing which are produced by the SL869 T Chapter 5 Document History provides of the changes made to this User Guide Danger This information MUST be followed or catastrophic equipment failure or bodi...

Страница 9: ...A 0183 protocol standard More information regarding the NMEA protocol and its use by the SL869 module family can be found in Section 2 of the Software Guides for public and authorized users listed as...

Страница 10: ...while the auto survey algorithm is underway the algorithm is restarted If the antenna position is accurately known a priori when the SL869 T timing module is installed the module can be commanded int...

Страница 11: ...ted Command ID Description PSTMENABLEPOSITIONHOLD Disable or Enable Position Hold mode and set reference position for timing PSTMPPS Manage PPS PSTMSETPAR Set system parameter Additionally extensions...

Страница 12: ...decimal 0 Position Hold will be disabled 1 Position Hold will be enabled Lat DDMM MMMM Latitude DegreesMinutes FractionalMinute N S N or S Latitude direction North or South Long DDDMM MMMM Longitude D...

Страница 13: ...S 1 13 cr lf The response to this command has the following format PSTMPPS 1 13 OnOff Lat N S Long E W Alt checksum cr lf Parameter Format Description OnOff One digit decimal 0 Position Hold is disabl...

Страница 14: ...mal Number of satellites used by the TRAIM algorithm RemovedSats Decimal Number of satellites removed by the TRAIM algorithm Example PSTMPPS 1 15 1 0 4 6 2 61 Satellites that have an estimated time er...

Страница 15: ...or satellites that are being used for timing correction Format PSTMPPS1 17 Enabled UsedSats Res1 ResN checksum cr lf Parameter Format Description Enabled One digit Decimal 0 TRAIM is Disabled 1 TRAIM...

Страница 16: ...eld position for timing It is functionally equivalent to the PSTMENABLEPOSITIONHOLD command Synopsis PSTMPPS 2 13 OnOff Lat N S Long E W Alt cr lf Parameter Format Description OnOff One digit decimal...

Страница 17: ...algorithm for 2 hours at 1Hz fix rate PSTMPPS 2 14 7200 It is important to note that the reference position for Position Hold will be updated when the algorithm completes its position estimation If a...

Страница 18: ...led using the command PSTMSETPAR 1201 mask mode cr lf where mask is a value representing the bit assignment s for the message or messages to be controlled The message will be enabled if mode is 1 or i...

Страница 19: ...ithin the range 1500 0 to 100000 0 In order for the new reference position to take effect the SL869 T must be rebooted after the position is saved to flash The default state of Position Hold at start...

Страница 20: ...ified number of samples takes effect when the parameter is saved to flash Please refer to section 3 2 7 for more information regarding the use of this value Example Configure the position auto survey...

Страница 21: ...Timing firmware Message ID Description PSTMPOSHOLD Position Hold status and reference position PSTMTRAIMSTATUS TRAIM algorithm status PSTMTRAIMUSED Satellites used for timing correction PSTMTRAIMRES...

Страница 22: ...South Long DDDMM MMMM Longitude DegreesMinutes FractionalMinute E W E or W Longitude direction East or West Alt dddddd dd Signed decimal up to 8 digits Mean Sea Level altitude in meters Example PSTMP...

Страница 23: ...s AvgError Decimal Average time error in nanoseconds UsedSats Decimal Number of satellites used by the TRAIM algorithm RemovedSats Decimal Number of satellites removed by the TRAIM algorithm RefSecond...

Страница 24: ...ple This example shows five satellites being used PRNs 22 6 18 15 and 3 PSTMTRAIMUSED 1 5 22 6 18 15 3 7E This proprietary NMEA message reports the time error residuals for satellites that are being u...

Страница 25: ...moved from use for timing correction Format PSTMTRAIMREMOVED OnOff RemovedSats Sat1 SatN checksum cr lf Parameter Format Description OnOff One digit Decimal 0 TRAIM is Off 1 TRAIM is On UsedSats Decim...

Страница 26: ...ew Added PSTMPPS command types related to TRAIM Added PSTMSETPAR command for controlling output messages related to timing 2 2014 10 01 Expanded introductory section on internal reference position aut...

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