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Control Port SentencesThe Control (CDU) Port is used to initialize, monitor, and control the receiver. The structure of the control port sentences is based on the NMEA-0183 Standard for Interfacing Marine Electronics Navigation Devices (version 1.5). For more details, please refer to the NMEA-0183 Specification available from the National Marine Electronics Association. Reserved characters are used to indicate the beginning and the end of records in the data stream, and to delimit data fields within a sentence. Only printable ASCII characters (Hex 20 through 7F) may be used in a sentence. Table 2 lists the reserved characters and defines their usage. Table 1 illustrates the general Magnavox proprietary NMEA sentence format. Table 1. Magnavox Proprietary NMEA Sentence Format$PMVXG,XXX,...................*CK
Table 2. NMEA Sentence Reserved Characters
Following the start character The data, delimited by commas, follows the sentence type. Note that the receiver uses a free-format parsing algorithm, so you need not send the exact number of characters shown in the examples. You will need to use the commas to determine how many bytes of data need to be retrieved. The notation Checksums are optional for Control Port input sentences, but are highly recommended to limit the effects of communication errors. Magnavox receivers always generate checksums for Control Port output sentences. ASCII data characters are transmitted in the following format:
NULL fields are fields which do not contain any data. They would appear as two commas together in the sentence format, except for the final field. Some Magnavox proprietary sentences require that the format contain NULL fields. mandatory NULL fields are identified by an '*' next to the respective field. Control Port Input SentencesThese are the subset of the MX4200 control port input sentences sent by the NTP driver to the GPS receiver.$PMVXG,000Initialization/Mode Control - Part AInitializes the time, position and antenna height of the MX4200.
$PMVXG,000,,,,,,,,,,*48 $PMVXG,000,,,,,5128.4651,N,00020.0715,W,58.04,*4F
$PMVXG,001Initialization/Mode Control - Part BSpecifies various navigation parameters: Altitude aiding, acceleration DOP limits, and satellite elevation limits.
$PMVXG,001,3,,0.1,0.1,10,10,5,U,0*06
$PMVXG,007Control Port Output ConfigurationThis message enables or disables output of the specified sentence and defines the output rate. The user sends this message for each sentence that the receiver is to output.
$PMVXG,007,022,0,1,,1,,,*4F
$PMVXG,023Time Recovery ConfigurationThis message is used to enable/disable the time recovery feature of the receiver. The time synchronization for the 1PPS output is specified in addition to a user time bias and an error tolerance for a valid pulse. This record is accepted in units configured for time recovery. If the back panel contains a 1PPS outlet, the receiver is a time recovery unit.
$PMVXG,023,S,U,A,500,0,1,*16
$CDGPQ,YYYQuery From a Remote Device / Request to Output a SentenceEnables the controller to request a one-time transmission of a specific block label. To output messages at a periodic rate, refer to input sentence $PMVXG,007.
$CDGPQ,030*5E
Control Port Output SentencesThese are the subset of the MX4200 control port output sentences recognized by the NTP driver.$PMVXG,000Receiver StatusReturns the current status of the receiver including the operating mode, number of satellites visible, and the number of satellites being tracked.
$PMVXG,000,TRK,3,3,0122,1*19
$PMVXG,021Position, Height, VelocityThis sentence gives the receiver position, height, navigation mode and velocity north/east. This sentence is intended for post analysis applications.
$PMVXG,021,142244.00,5128.4744,N,00020.0593,W,00054.4,0047.4,0000.1,-000.2,03*66
$PMVXG,022DOPsThis sentence reports the DOP (Dilution Of Precision) values actually used in the measurement processing corresponding to the satellites listed. The satellites are listed in receiver channel order. Fields 11-16 are output only on 12-channel receivers.
$PMVXG,022,142243.00,00.7,00.8,01.9,27,26,10,09,13,23*77
$PMVXG,030Software ConfigurationThis sentence contains the navigation processor and baseband firmware version numbers.
$PMVXG,030,DA35,015
$PMVXG,101Control Sentence Accept/RejectThis sentence is returned (on the Control Port) for every $PMVXG and $XXGPQ sentence that is received.
$PMVXG,101,GPQ,0,,030*0D
$PMVXG,523Time Recovery ConfigurationThis sentence contains the configuration of the time recovery function of the receiver.
$PMVXG,523,S,U,A,0500,000000,1,0*23
$PMVXG,830Time Recovery ResultsThis sentence is output approximately 1 second preceding the 1PPS output. It indicates the exact time of the next pulse, whether or not the time mark will be valid (based on operator-specified error tolerance), the time to which the pulse is synchronized, the receiver operating mode, and the time error of the last 1PPS output. The leap second flag (Field #11) is not output by older receivers.
$PMVXG,830,T,1998,10,12,15:30:46,U,S,000298,00003,000000,01*02
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